Pretty new on this android stuff and gets a NullPointException that I can't seem to figure out. I am trying to implement an onResume() method in my CameraActivity and have moved almost all of the orginal code in onCreate() to onResume() and then call onResume() in onCreate(). The activity worked fine when the code was in onCreate(), but when placed in onResume() the exception arsises. What is causing it?
package com.example.tensioncamapp_project;
import java.io.IOException;
import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "PreviewAactivity";
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraPreview(Context context, Camera camera) {
super(context);
this.mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
this.mHolder = getHolder();
this.mHolder.addCallback(this);
}
/**Displays the picture on the camera */
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
this.mCamera.setPreviewDisplay(holder);
this.mCamera.startPreview();
} catch (IOException e) {
Log.d(TAG, "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
this.mCamera.release();
this.mCamera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
//add things here
}
}
and my CameraActivityClass
package com.example.tensioncamapp_project;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Date;
import java.text.SimpleDateFormat;
import android.content.Intent;
import android.app.Activity;
import android.graphics.Bitmap;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.ImageView;
public class CameraActivity extends Activity {
private ImageButton captureButton;
private Camera mCamera;
private CameraPreview mPreview;
private PictureCallback mPicture;
private ImageView imageView;
private static final int STD_DELAY = 400;
private static final int MEDIA_TYPE_IMAGE = 1;
protected static final String TAG = "CameraActivity";
/**Starts up the camera */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
onResume();
}
/**Connects the capture button on the view to a listener
* and redirects the client to a preview of the captures image*/
private void addListenerOnButton() {
this.captureButton = (ImageButton) findViewById(R.id.button_capture_symbol);
this.captureButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View capturebutton) {
mCamera.takePicture(null, null, mPicture);
delay();
Intent viewPic = new Intent(CameraActivity.this, ViewPicActivity.class);
startActivity(viewPic);
}
});
}
/** A safe way to get an instance of the Camera object. Code collected from elsewhere */
public static Camera getCameraInstance(){
Camera c = null;
try {
// attempt to get a Camera instance
c = Camera.open();
//getting current parameters
Camera.Parameters params = c.getParameters();
//setting new parameters with flash
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
c.setParameters(params);
}
catch (Exception e){
// camera is not available (in use or does not exist)
}
// returns null if camera is unavailable
return c;
}
/**Generates a delay needed for application to save new pictures */
private void delay(){
try {
//Makes the program inactive for a specific amout of time
Thread.sleep(STD_DELAY);
} catch (Exception e) {
e.getStackTrace();
}
}
/**Method for releasing the camera immediately on pause event*/
#Override
protected void onPause() {
super.onPause();
//Shuts down the preview shown on the screen
mCamera.stopPreview();
//Calls an internal help method to restore the camera
releaseCamera();
}
/**Help method to release the camera */
private void releaseCamera(){
//Checks if there is a camera object active
if (this.mCamera != null){
//Releases the camera
this.mCamera.release();
//Restore the camera object to its initial state
this.mCamera = null;
}
}
/**Activates the camera and makes it appear on the screen */
protected void onResume() {
// TODO Auto-generated method stub
// deleting image from external storage
FileHandler.deleteFromExternalStorage();
// Create an instance of Camera.
this.mCamera = getCameraInstance();
// Create our Preview view and set it as the content of our activity.
this.mPreview = new CameraPreview(this, this.mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(this.mPreview);
//add the capture button
addListenerOnButton();
// In order to receive data in JPEG format
this.mPicture = new PictureCallback() {
/**Creates a file when a image is taken, if the file doesn't already exists*/
#Override
public void onPictureTaken(byte[] data, Camera mCamera) {
File pictureFile = FileHandler.getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null){
Log.d(TAG, "Error creating media file, check storage permissions");
return;
}
try {
//Writes the image to the disc
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
};
super.onResume();
}
}
Log cat:
05-21 14:32:05.424: D/OpenGLRenderer(1030): Enabling debug mode 0
05-21 14:32:10.986: E/CameraActivity(1030): camera not availableFail to connect to camera service
05-21 14:32:11.033: I/Choreographer(1030): Skipped 66 frames! The application may be doing too much work on its main thread.
05-21 14:32:11.203: W/EGL_emulation(1030): eglSurfaceAttrib not implemented
05-21 14:32:13.013: D/AndroidRuntime(1030): Shutting down VM
05-21 14:32:13.013: W/dalvikvm(1030): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
05-21 14:32:13.083: E/AndroidRuntime(1030): FATAL EXCEPTION: main
05-21 14:32:13.083: E/AndroidRuntime(1030): java.lang.NullPointerException
05-21 14:32:13.083: E/AndroidRuntime(1030): at com.example.tensioncamapp_project.CameraPreview.surfaceCreated(CameraPreview.java:33)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.SurfaceView.updateWindow(SurfaceView.java:569)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.SurfaceView.access$000(SurfaceView.java:86)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:174)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:680)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1842)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.Choreographer.doFrame(Choreographer.java:532)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.os.Handler.handleCallback(Handler.java:725)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.os.Handler.dispatchMessage(Handler.java:92)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.os.Looper.loop(Looper.java:137)
05-21 14:32:13.083: E/AndroidRuntime(1030): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-21 14:32:13.083: E/AndroidRuntime(1030): at java.lang.reflect.Method.invokeNative(Native Method)
05-21 14:32:13.083: E/AndroidRuntime(1030): at java.lang.reflect.Method.invoke(Method.java:511)
05-21 14:32:13.083: E/AndroidRuntime(1030): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-21 14:32:13.083: E/AndroidRuntime(1030): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-21 14:32:13.083: E/AndroidRuntime(1030): at dalvik.system.NativeStart.main(Native Method)
The solution was to call the getCameraInstancemethod() in onResume() in an if-statement
protected void onResume() {
// TODO Auto-generated method stub
// deleting image from external storage
FileHandler.deleteFromExternalStorage();
// Create an instance of Camera.
if (this.mCamera == null){
this.mCamera = getCameraInstance();}
I think your problem is here
this.mPreview = new CameraPreview(this, this.mCamera);
this.mCamera seems to be null, it's not be set a new instance of the class, this needs to be done in the getCameraInstance() method.
getCameraInstance() returns null if an exception was thrown.
This cause the NPE as this.mCamera is null.
You should check if an exception was thrown in getCameraInstance and handle it correctly. The most basic thing is to log it and try to understand the reason.
Related
im trying to run a Camera Service in the Background, as soon after the Service has started i get an error takePicture failed. I'm new to Android,new to Stackoverflow and also not a good programmer.
I've added the right permissions and the service has been declared in the manifest file too.
package com.example.nevii.camera;
import android.app.Service;
import android.content.Intent;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.IBinder;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
import java.io.IOException;
public class CameraService extends Service
{
//Camera variables
//a surface holder
private SurfaceHolder sHolder;
//a variable to control the camera
private Camera mCamera;
//the camera parameters
private Parameters parameters;
private boolean safeToTakePicture = false;
/** Called when the activity is first created. */
#Override
public void onCreate()
{
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
super.onStartCommand(intent, flags, startId);
Toast.makeText(getBaseContext(), "onStartCommand", Toast.LENGTH_SHORT).show();
mCamera = Camera.open(1);
mCamera.setDisplayOrientation(90);
SurfaceView sv = new SurfaceView(getApplicationContext());
try {
mCamera.setPreviewDisplay(sv.getHolder());
parameters = mCamera.getParameters();
//set camera parameters
mCamera.setParameters(parameters);
mCamera.startPreview();
safeToTakePicture = true;
takePic();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//stop the preview
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
//Get a surface
sHolder = sv.getHolder();
//tells Android that this surface will have its data constantly replaced
sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
return START_STICKY;
}
public void takePic(){
Camera.PictureCallback mCall = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
//decode the data obtained by the camera into a Bitmap
MyCamera myCamera = new MyCamera();
myCamera.SavePicture(data);
//stop the preview
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
};
mCamera.takePicture(null, null, mCall);
Toast.makeText(getApplicationContext(),"Pic taken",Toast.LENGTH_LONG).show();
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
I got the SourceCode from here:http://androideasylessons.blogspot.ch/2012/09/capture-image-without-surface-view-as.html
In the MainActivity i started the Service using:
startService(new Intent(this, CameraService.class));
myCamera.SavePicture is just an Asynchtask, which saves the Picture, i don't think there's a problem with that.
I hope you guys can help me.
Happy Coding!
UPDATE Logcat Error:
03-03 09:04:46.150 27530-27530/com.example.nevii.videocam D/Camera﹕ app passed NULL surface
03-03 09:04:46.153 27530-27530/com.example.nevii.videocam D/AndroidRuntime﹕ Shutting down VM
03-03 09:04:46.154 27530-27530/com.example.nevii.videocam E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.nevii.videocam, PID: 27530
java.lang.RuntimeException: Unable to start service com.example.nevii.videocam.CameraService#3f53f37f with Intent { cmp=com.example.nevii.videocam/.CameraService }: java.lang.RuntimeException: takePicture failed
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2881)
at android.app.ActivityThread.access$2100(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1376)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.RuntimeException: takePicture failed
at android.hardware.Camera.native_takePicture(Native Method)
at android.hardware.Camera.takePicture(Camera.java:1436)
at android.hardware.Camera.takePicture(Camera.java:1381)
at com.example.nevii.videocam.CameraService.takePic(CameraService.java:101)
at com.example.nevii.videocam.CameraService.onStartCommand(CameraService.java:57)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2864)
at android.app.ActivityThread.access$2100(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1376)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
just add SurfaceTexture st = new SurfaceTexture(MODE_PRIVATE); mCamera.setPreviewTexture(st);
before mCamera.startPreview();
I have developed simple android imageview that uses viewpager, and it plays music in background. It also stops music when last image is reached and it will resume the music when user slides back to the images. However, my main problem is that when device goes to sleep music stops and when device starts again instead of resuming music again and displaying image..It force closes... Any suggestion on how to fix this issue...Following are my codes...
Mainactivity.java
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ShareActionProvider;
public class MainActivity extends Activity {
MediaPlayer oursong;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
oursong = MediaPlayer.create(MainActivity.this, R.raw.a);
oursong.seekTo(0);
oursong.start();
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
final ImageAdapter adapter = new ImageAdapter(this);
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
#Override
public void onPageSelected(int pos) {
if (pos == adapter.getCount() - 1)
{
oursong.pause();
} else if (!oursong.isPlaying())
{
oursong.start();
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
}
private ShareActionProvider mShareActionProvider;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate menu resource file.
getMenuInflater().inflate(R.menu.activity_main, menu);
// Locate MenuItem with ShareActionProvider
MenuItem item = menu.findItem(R.id.menu_item_share);
// Fetch and store ShareActionProvider
mShareActionProvider = (ShareActionProvider) item.getActionProvider();
// Return true to display menu
return true;
}
// Call to update the share intent
private void setShareIntent(Intent shareIntent) {
if (mShareActionProvider != null) {
mShareActionProvider.setShareIntent(shareIntent);
}
}
#Override
protected void onPause() {
super.onPause();
oursong.release();
}
}
ImageAdapter.java
import java.io.IOException;
import android.app.WallpaperManager;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class ImageAdapter extends PagerAdapter {
Context context;
private final int[] GalImages = new int[] {
R.drawable.one,
R.drawable.two,
R.drawable.three
};
ImageAdapter(Context context){
this.context=context;
}
#Override
public int getCount() {
return GalImages.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
#Override
public Object instantiateItem(ViewGroup container, final int position) {
ImageView imageView = new ImageView(context);
int padding = context.getResources().getDimensionPixelSize(R.dimen.padding_small);
imageView.setPadding(padding, padding, padding, padding);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setImageResource(GalImages[position]);
imageView.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
WallpaperManager myWallpaperManager = WallpaperManager.getInstance(context);
try {
myWallpaperManager.setResource(GalImages[position]);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
((ViewPager) container).addView(imageView, 0);
return imageView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((ImageView) object);
}
}
Logcat errors.... (Following Logcat was taken when app was running on actual device)
08-29 02:48:21.051: I/dalvikvm(2880): Could not find method android.widget.ShareActionProvider.setShareIntent, referenced from method com.manishkpr.viewpagerimagegallery.MainActivity.setShareIntent
08-29 02:48:21.051: W/dalvikvm(2880): VFY: unable to resolve virtual method 3259: Landroid/widget/ShareActionProvider;.setShareIntent (Landroid/content/Intent;)V
08-29 02:48:21.051: D/dalvikvm(2880): VFY: replacing opcode 0x6e at 0x0006
08-29 02:48:21.066: I/dalvikvm(2880): Could not find method android.view.MenuItem.getActionProvider, referenced from method com.manishkpr.viewpagerimagegallery.MainActivity.onCreateOptionsMenu
08-29 02:48:21.066: W/dalvikvm(2880): VFY: unable to resolve interface method 2912: Landroid/view/MenuItem;.getActionProvider ()Landroid/view/ActionProvider;
08-29 02:48:21.066: D/dalvikvm(2880): VFY: replacing opcode 0x72 at 0x0010
08-29 02:48:21.066: D/dalvikvm(2880): VFY: dead code 0x0013-0019 in Lcom/manishkpr/viewpagerimagegallery/MainActivity;.onCreateOptionsMenu (Landroid/view/Menu;)Z
08-29 02:48:21.230: W/MediaPlayer-cpp(2880): info/warning (802, 0)
08-29 02:48:21.348: I/MediaPlayer(2880): Info (802,0)
08-29 02:48:21.434: D/dalvikvm(2880): GC_EXTERNAL_ALLOC freed 1117 objects / 212256 bytes in 71ms
08-29 02:48:36.644: D/dalvikvm(2880): GC_EXTERNAL_ALLOC freed 553 objects / 29584 bytes in 32ms
08-29 02:50:00.566: D/AndroidRuntime(2880): Shutting down VM
08-29 02:50:00.566: W/dalvikvm(2880): threadid=1: thread exiting with uncaught exception (group=0x4001d8a8)
08-29 02:50:00.605: E/AndroidRuntime(2880): FATAL EXCEPTION: main
08-29 02:50:00.605: E/AndroidRuntime(2880): java.lang.RuntimeException: Unable to resume activity {com.manishkpr.viewpagerimagegallery/com.manishkpr.viewpagerimagegallery.MainActivity}: java.lang.IllegalStateException
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3128)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3143)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2059)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.os.Handler.dispatchMessage(Handler.java:99)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.os.Looper.loop(Looper.java:123)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-29 02:50:00.605: E/AndroidRuntime(2880): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 02:50:00.605: E/AndroidRuntime(2880): at java.lang.reflect.Method.invoke(Method.java:521)
08-29 02:50:00.605: E/AndroidRuntime(2880): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-29 02:50:00.605: E/AndroidRuntime(2880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-29 02:50:00.605: E/AndroidRuntime(2880): at dalvik.system.NativeStart.main(Native Method)
08-29 02:50:00.605: E/AndroidRuntime(2880): Caused by: java.lang.IllegalStateException
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.media.MediaPlayer.seekTo(Native Method)
08-29 02:50:00.605: E/AndroidRuntime(2880): at com.manishkpr.viewpagerimagegallery.MainActivity.onResume(MainActivity.java:86)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.Activity.performResume(Activity.java:3823)
08-29 02:50:00.605: E/AndroidRuntime(2880): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3118)
08-29 02:50:00.605: E/AndroidRuntime(2880): ... 10 more
08-29 02:50:10.371: I/Process(2880): Sending signal. PID: 2880 SIG: 9
Have you tried moving your music playback to onResume() Activity lifecycle with fragments won't call onCreate() again until you activity is 're created. So the playback won't be resumed without closing your app.
Something like this
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ShareActionProvider;
public class MainActivity extends Activity {
MediaPlayer oursong;
ViewPager viewPager;
ImageAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
oursong = MediaPlayer.create(MainActivity.this, R.raw.a);
oursong.seekTo(0);
oursong.start();
viewPager = (ViewPager) findViewById(R.id.view_pager);
adapter = new ImageAdapter(this);
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(MyViewPagerListener);
}
private ShareActionProvider mShareActionProvider;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate menu resource file.
getMenuInflater().inflate(R.menu.activity_main, menu);
// Locate MenuItem with ShareActionProvider
MenuItem item = menu.findItem(R.id.menu_item_share);
// Fetch and store ShareActionProvider
mShareActionProvider = (ShareActionProvider) item.getActionProvider();
// Return true to display menu
return true;
}
// Call to update the share intent
private void setShareIntent(Intent shareIntent) {
if (mShareActionProvider != null) {
mShareActionProvider.setShareIntent(shareIntent);
}
}
#Override
protected void onPause() {
super.onPause();
if(oursong != null){
oursong.release();
}
}
#Override
protected void onResume(){
super.onResume();
/*
* This is the important part, basically since your releasing the song
* in onPause() you are getting rid of its reference, in this case check
* if your song is null then if it is re-create it, else you can reuse the
* the original, but i suspect that calling release() in onPause() allows the
* song to get cleaned up by Java's Garbage Collector.
*/
if(oursong == null){
oursong = MediaPlayer.create(MainActivity.this, R.raw.a);
oursong.seekTo(0); // You will probably want to save an int to restore here
oursong.start();
}else{
oursong.seekTo();
oursong.start();
}
}
/*
* May want to add two methods here: onSaveInstanceState(Bundle outstate) &
* onRestoreInstanceState(Bundle savedInstanceState) to maintain playback position
* in onResume instead of just restarting the song.
*/
private final OnPageChangeListener MyViewPagerListener = new OnPageChangeListener() {
#Override
public void onPageSelected(int pos) {
if (pos == adapter.getCount() - 1){
// adding null checks for safety
if(oursong != null){
oursong.pause();
}
} else if (!oursong.isPlaying()){
// adding null check for safety
if(oursong != null){
oursong.start();
}
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
};
}
Hope this helps you resolve your problem.
I am trying to build my own custom camera application I have learn through the Android developers Group about how to code the whole application but as soon as I launch the camera it crashes I don't know what is the problem here is my code:
package com.example.tapeit;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore.Files.FileColumns;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
public class CameraActivity extends Activity implements Camera.PictureCallback {
private Camera mCamera;
private CameraPreview mPreview;
String TAG = "TapeIt";
public static final int MEDIA_TYPE_IMAGE = 1;
Button captureButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.preview_layout);
mCamera = getCameraInstance();
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(preview);
captureButton = (Button) findViewById(R.id.button_capture);
captureButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
mCamera.takePicture(null, null, mPicture);
}
});
}
private boolean checkCameraHardware(Context context){
if(context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
return true;
}else{
return false;
}
}
public static Camera getCameraInstance() {
// TODO Auto-generated method stub
Camera c = null;
try {
c = Camera.open();
} catch (Exception e) {
}
return c;
}
private PictureCallback mPicture = new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null){
Log.d(TAG, "Error creating media file, check storage permissions: " );
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
};
private static File getOutputMediaFile(int mediaTypeImage) {
// TODO Auto-generated method stub
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "CameraApp");
if(! mediaStorageDir.exists()){
if(! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile = new File(mediaStorageDir.getPath() + File.separator +"IMG_"+ timeStamp + ".jpg");
return mediaFile;
}
#Override
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null){
Log.d(TAG, "Error creating media file, check storage permissions: " );
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
private void releaseCamera(){
if (mCamera != null){
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
}
And here is my preview Class:
package com.example.tapeit;
import java.io.IOException;
import android.content.Context;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.hardware.Camera;
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback{
private Camera mCamera;
private SurfaceHolder mHolder;
String TAG = "TapeIt";
public CameraPreview (Context context, Camera camera){
super(context);
mCamera = camera;
mHolder = getHolder();
mHolder.addCallback(this);
}
public void surfaceCreated(SurfaceHolder holder){
try{
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
}catch(IOException e){
Log.d(TAG, "Error setting camera preview" + e.getMessage());
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// TODO Auto-generated method stub
if(mHolder.getSurface() == null){
return;
}
try{
mCamera.stopPreview();
}catch(Exception e){
}
//You should make here changes when the device is rotated or when any other change
// set preview size and make any resize, rotate or
// reformatting changes here
//mCamera.getParameters().getSupportedPreviewSizes();
try{
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
}catch(IOException e){
Log.d(TAG, "Error setting camera preview" + e.getMessage());
}
}
#Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
}
My manifest uses all the permision here they are:
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature android:name="android.hardware.camera" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.tapeit.CameraActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
My logcat in the console is posted here:
04-04 11:19:32.010: D/AndroidRuntime(21270): Shutting down VM
04-04 11:19:32.010: W/dalvikvm(21270): threadid=1: thread exiting with uncaught exception (group=0x40eb72a0)
04-04 11:19:32.010: E/AndroidRuntime(21270): FATAL EXCEPTION: main
04-04 11:19:32.010: E/AndroidRuntime(21270): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tapeit/com.example.tapeit.CameraActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2092)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2117)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.ActivityThread.access$700(ActivityThread.java:134)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1218)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.os.Handler.dispatchMessage(Handler.java:99)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.os.Looper.loop(Looper.java:137)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.ActivityThread.main(ActivityThread.java:4867)
04-04 11:19:32.010: E/AndroidRuntime(21270): at java.lang.reflect.Method.invokeNative(Native Method)
04-04 11:19:32.010: E/AndroidRuntime(21270): at java.lang.reflect.Method.invoke(Method.java:511)
04-04 11:19:32.010: E/AndroidRuntime(21270): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
04-04 11:19:32.010: E/AndroidRuntime(21270): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
04-04 11:19:32.010: E/AndroidRuntime(21270): at dalvik.system.NativeStart.main(Native Method)
04-04 11:19:32.010: E/AndroidRuntime(21270): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.view.ViewGroup.addViewInner(ViewGroup.java:3439)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.view.ViewGroup.addView(ViewGroup.java:3310)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.view.ViewGroup.addView(ViewGroup.java:3255)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.view.ViewGroup.addView(ViewGroup.java:3231)
04-04 11:19:32.010: E/AndroidRuntime(21270): at com.example.tapeit.CameraActivity.onCreate(CameraActivity.java:39)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.Activity.performCreate(Activity.java:5047)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
04-04 11:19:32.010: E/AndroidRuntime(21270): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2056)
04-04 11:19:32.010: E/AndroidRuntime(21270): ... 11 more
preview.addView(preview);
You are attempting to add the FrameLayout to itself. This will not work.
Presumably, the parameter should be mPreview.
You may wish to use more distinctive names for variables, such as not having both preview and mPreview.
I am developing an app with slide fragments. Everything works fine, app starts without problems. Problem happens in View.onClickListener. Here is a code of my single fragment section:
public static class ReceiveSectionFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.receive, container, false);
rootView.findViewById(R.id.bt_server_start)
.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), Receive.class);
startActivity(intent);
}
});
return rootView;
}
}
Sliding to target layout - R.layout.receive works well. So no problem here. On R.id.bt_server_start button click class below is started:
package com.receive.bluereceive;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.UUID;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.CountDownTimer;
import android.os.Vibrator;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;
public class Receive extends Activity {
/**
* Default Serial-Port UUID
*/
private String myUUID = "00001101-0000-1000-8000-00805F9B34FB";
/**
* Default Bluetooth adapter on the device.
*/
private final BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
/**
* Magic number used in the Bluetooth enabling request.
*/
public final int REQUEST_ENABLE_BT = 2;
/**
* The Server thread.
*/
private AcceptThread DeviceServer;
private NotificationCenter mNotificationCenter;
public final static String EXTRA_MESSAGE = "com.receive.intent.MESSAGE";
public final int BT_ENABLE_TIME = 35;
public final int BT_TIME_BTTIME = 1000 * BT_ENABLE_TIME;
public CountDownTimer BTCountDown;
public CountDownTimer MoveHistoryCountDown;
#Override
protected void onStart() {
super.onStart();
mNotificationCenter = new NotificationCenter();
/*
* Code responsible for calling method NotificationCenter() to print the incoming text to TextView field
*/
registerReceiver(mNotificationCenter, new IntentFilter(EXTRA_MESSAGE));
/*
* Start server on device
*/
ServerThread();
((Button) findViewById(R.id.bt_server_start)).setEnabled(false);
((Button) findViewById(R.id.bt_server_stop)).setEnabled(true);
}
public void ServerThread() {
DeviceServer = new AcceptThread();
DeviceServer.start();
}
private class AcceptThread extends Thread {
/*
* That TAG will appear in the log in Eclipse
*/
private final String ACC_TAG = AcceptThread.class.getName();
/*
* Bluetooth server socket
*/
private final BluetoothServerSocket mServerSocket;
public AcceptThread() {
/*
* Use a temporary object that is later assigned to mServerSocket, because mServerSocket is final
*/
BluetoothServerSocket tmp = null;
try {
/*
* MY_UUID is the app's UUID string, also used by the client code
*/
tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(ACC_TAG, UUID.fromString(myUUID));
} catch (IOException e) { }
mServerSocket = tmp;
}
public void run() {
BluetoothSocket socket = null;
/*
* Keep listening until exception occurs or a socket is returned
*/
while (true) {
try {
Log.i(ACC_TAG,"Listening for a connection nearby...");
socket = mServerSocket.accept();
Log.i(ACC_TAG, "Connected to " + socket.getRemoteDevice().getName());
} catch (IOException e) {
break;
}
/*
* If connection was accepted then proceed with code below
* If Bluetooth socket does not equal null proceed with string reading as know script knows that device is connected
* And if it is first ServerThread start,
*/
if (socket != null) {
try {
String message;
DataInputStream incoming = new DataInputStream(socket.getInputStream());
message = incoming.readUTF();
Intent actual = new Intent(EXTRA_MESSAGE);
actual.putExtra("Message", String.format("%s",message));
getBaseContext().sendBroadcast(actual);
} catch (IOException e) {
Log.e(ACC_TAG, "Error obtaining InputStream from socket");
e.printStackTrace();
}
try {
mServerSocket.close();
} catch (IOException e) { }
break;
}
}
}
/*
* Will cancel the listening socket, and cause the thread to finish
*/
public void cancel() {
try {
mServerSocket.close();
} catch (IOException e) { }
}
}
private Vibrator getVibrator() {
return (Vibrator) getSystemService(VIBRATOR_SERVICE);
}
/*
* NOTIFICATION CLASS, PRINTS THE RECEIVED MESSAGE
*/
public class NotificationCenter extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals(EXTRA_MESSAGE)) {
int counter = 0;
ArrayList<String> historiaAL = new ArrayList<String>();
historiaAL.add(intent.getExtras().getString("Message"));
TextView actual = (TextView)findViewById(R.id.received_string);
actual.setText(historiaAL.get(counter));
TextView history = (TextView)findViewById(R.id.history_string);
String[] historiaA = historiaAL.toArray(new String[historiaAL.size()]);
for(int i = 0; i < historiaAL.size(); i++)
{
history.append(historiaA[i]);
history.append(" \n ");
}
getVibrator().vibrate(500);
MoveHistoryCountDown = new HistoryMove(5000,5);
MoveHistoryCountDown.start();
counter++;
}
}
}
public class HistoryMove extends CountDownTimer {
public HistoryMove (long startTime, long interval) {
super(startTime, interval);
}
#Override
public void onFinish() {
TextView recent = (TextView)findViewById(R.id.received_string);
recent.setText(" ");
}
#Override
public void onTick(long millisUntilFinished) {
}
}
}
Everything is included in Manifest.xml. What I get from LogCat is this:
12-18 00:36:14.136: E/AndroidRuntime(29672): FATAL EXCEPTION: main
12-18 00:36:14.136: E/AndroidRuntime(29672): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.receive.bluereceive/com.receive.bluereceive.Receive}: java.lang.NullPointerException
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2308)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.ActivityThread.access$600(ActivityThread.java:153)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.os.Looper.loop(Looper.java:137)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.ActivityThread.main(ActivityThread.java:5227)
12-18 00:36:14.136: E/AndroidRuntime(29672): at java.lang.reflect.Method.invokeNative(Native Method)
12-18 00:36:14.136: E/AndroidRuntime(29672): at java.lang.reflect.Method.invoke(Method.java:511)
12-18 00:36:14.136: E/AndroidRuntime(29672): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
12-18 00:36:14.136: E/AndroidRuntime(29672): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
12-18 00:36:14.136: E/AndroidRuntime(29672): at dalvik.system.NativeStart.main(Native Method)
12-18 00:36:14.136: E/AndroidRuntime(29672): Caused by: java.lang.NullPointerException
12-18 00:36:14.136: E/AndroidRuntime(29672): at com.receive.bluereceive.Receive.onStart(Receive.java:68)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1164)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.Activity.performStart(Activity.java:5114)
12-18 00:36:14.136: E/AndroidRuntime(29672): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2271)
12-18 00:36:14.136: E/AndroidRuntime(29672): ... 11 more
Probably this is some rookie mistake but still, it has been an hour and I still can not crack that out.
Please no downgrade reputation, I really can not have it working even tho it might seems trivial.
EDIT: Full main code - http://pastebin.com/e4dyW8Th
I don't see setContentView called anywhere in your activity which would mean that findViewById returns null.
Add onCreate method to your activity and call setContentView to set your layout.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_activity);
}
I am trying to implement the ability for users browsing my app to set images as wallpapers. I am using Universal Image Loader and everything works great except for when it comes time to set the wallpaper. I have tried several different methods from Stackoverflow and other websites but have had no success. This last attempt I used the solution from here: Android set image as wallpaper
After implementing it everything runs okay up until the point I select the button (setwallbtn) that calls setWall. At that point I get a bunch of errors in my logcat (full logcat error posted below, after the code).
Below is the pageview_item.xml and the ImagePagerActivity.java.
Any help that anyone can offer would be greatly appreciated!
Thank you!
pageview_item.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="1dip" >
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:contentDescription="#string/descr_image" />
<ProgressBar
android:id="#+id/loading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone" />
<ImageView
android:id="#+id/setwallbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:adjustViewBounds="true"
android:clickable="true"
android:contentDescription="#string/setwall"
android:maxHeight="55dp"
android:onClick="setWall"
android:src="#drawable/setwallpaper" />
</FrameLayout>
imagepageractivity.java
import java.io.IOException;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
import com.rwilco12.wallpapergallery.Constants.Extra;
/**
* #original author Sergey Tarasevich (nostra13[at]gmail[dot]com)
*/
public class ImagePagerActivity extends BaseActivity {
private static final String STATE_POSITION = "STATE_POSITION";
DisplayImageOptions options;
ViewPager pager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pageview);
Bundle bundle = getIntent().getExtras();
String[] imageUrls = bundle.getStringArray(Extra.IMAGES);
int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);
if (savedInstanceState != null) {
pagerPosition = savedInstanceState.getInt(STATE_POSITION);
}
options = new DisplayImageOptions.Builder()
.showImageForEmptyUri(R.drawable.error)
.showImageOnFail(R.drawable.error)
.resetViewBeforeLoading()
.cacheOnDisc()
.bitmapConfig(Bitmap.Config.RGB_565)
.resetViewBeforeLoading()
.imageScaleType(ImageScaleType.IN_SAMPLE_INT)
.build();
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new ImagePagerAdapter(imageUrls));
pager.setCurrentItem(pagerPosition);
}
//Begin code from: https://stackoverflow.com/questions/11938182/android-set-image-as-wallpaper
// fetch bitmap from view
public static Bitmap getBitmapFromView(View view) {
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view
.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
bgDrawable.draw(canvas);
else
// if we unable to get background drawable then we will set white color as wallpaper
canvas.drawColor(Color.WHITE);
view.draw(canvas);
return returnedBitmap;
}
public void setWall(int i) {
WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
try {
// below line of code will set your current visible pager item to wallpaper
// first we have to fetch bitmap from visible view and then we can pass it to wallpaper
myWallpaperManager.setBitmap(getBitmapFromView(pager.getChildAt(1)));
// below line of code will set input stream data directly to wallpaper
// myWallpaperManager.setStream(InputStream Data);
// below line of code will set any image which is in the drawable folder
// myWallpaperManager.setResource(R.drawable.icon);
} catch (IOException e) {
e.printStackTrace();
}
}
//End code from: https://stackoverflow.com/questions/11938182/android-set-image-as-wallpaper
#Override
public void onSaveInstanceState(Bundle outState) {
outState.putInt(STATE_POSITION, pager.getCurrentItem());
}
private class ImagePagerAdapter extends PagerAdapter {
private String[] images;
private LayoutInflater inflater;
ImagePagerAdapter(String[] images) {
this.images = images;
inflater = getLayoutInflater();
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
#Override
public void finishUpdate(View container) {
}
#Override
public int getCount() {
return images.length;
}
#Override
public Object instantiateItem(ViewGroup view, int position) {
View imageLayout = inflater.inflate(R.layout.pageview_item, view, false);
ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image);
final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading);
imageLoader.displayImage(images[position], imageView, options, new SimpleImageLoadingListener() {
#Override
public void onLoadingStarted(String imageUri, View view) {
spinner.setVisibility(View.VISIBLE);
}
#Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
String message = null;
switch (failReason.getType()) {
case IO_ERROR:
message = "Input/Output error";
break;
case DECODING_ERROR:
message = "Image can't be decoded";
break;
case NETWORK_DENIED:
message = "Downloads are denied";
break;
case OUT_OF_MEMORY:
message = "Out Of Memory error";
break;
case UNKNOWN:
message = "Unknown error";
break;
}
Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show();
spinner.setVisibility(View.GONE);
}
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
spinner.setVisibility(View.GONE);
}
});
((ViewPager) view).addView(imageLayout, 0);
return imageLayout;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view.equals(object);
}
#Override
public void restoreState(Parcelable state, ClassLoader loader) {
}
#Override
public Parcelable saveState() {
return null;
}
#Override
public void startUpdate(View container) {
}
}
logcat error
09-28 10:01:36.334: W/dalvikvm(26948): threadid=1: thread exiting with uncaught exception (group=0x420772a0)
09-28 10:01:36.334: E/AndroidRuntime(26948): FATAL EXCEPTION: main
09-28 10:01:36.334: E/AndroidRuntime(26948): java.lang.IllegalStateException: Could not find a method setWall(View) in the activity class com.rwilco12.wallpapergallery.ImagePagerActivity for onClick handler on view class android.widget.ImageView with id 'setwallbtn'
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.view.View$1.onClick(View.java:3686)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.view.View.performClick(View.java:4223)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.view.View$PerformClick.run(View.java:17281)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.os.Handler.handleCallback(Handler.java:615)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.os.Handler.dispatchMessage(Handler.java:92)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.os.Looper.loop(Looper.java:137)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.app.ActivityThread.main(ActivityThread.java:4898)
09-28 10:01:36.334: E/AndroidRuntime(26948): at java.lang.reflect.Method.invokeNative(Native Method)
09-28 10:01:36.334: E/AndroidRuntime(26948): at java.lang.reflect.Method.invoke(Method.java:511)
09-28 10:01:36.334: E/AndroidRuntime(26948): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
09-28 10:01:36.334: E/AndroidRuntime(26948): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
09-28 10:01:36.334: E/AndroidRuntime(26948): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:106)
09-28 10:01:36.334: E/AndroidRuntime(26948): at dalvik.system.NativeStart.main(Native Method)
09-28 10:01:36.334: E/AndroidRuntime(26948): Caused by: java.lang.NoSuchMethodException: setWall [class android.view.View]
09-28 10:01:36.334: E/AndroidRuntime(26948): at java.lang.Class.getConstructorOrMethod(Class.java:460)
09-28 10:01:36.334: E/AndroidRuntime(26948): at java.lang.Class.getMethod(Class.java:915)
09-28 10:01:36.334: E/AndroidRuntime(26948): at android.view.View$1.onClick(View.java:3679)
09-28 10:01:36.334: E/AndroidRuntime(26948): ... 12 more
Try setting the onclick to match what the lolcat wants
something like this:
public void setWall(View v) {
WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
try {
// below line of code will set your current visible pager item to wallpaper
// first we have to fetch bitmap from visible view and then we can pass it to wallpaper
myWallpaperManager.setBitmap(getBitmapFromView(v));
} catch (IOException e) {
e.printStackTrace();
}
}