The class that uses the VideoService:
private final class MobileNotifier {
private static final String SHORT_BEEP_PATH = "/sounds/ShortBeep.wav";
private static final String LONG_BEEP_PATH = "/sounds/LongBeep.wav";
VideoService service;
MobileNotifier() {
this.service = VideoService.create().get();
service.getPlaylist().add(SHORT_BEEP_PATH);
}
public void alert(Alert alert) {
switch (alert) {
case NONE -> {
System.out.println("NONE: stopping");
service.stop();
System.out.println("NONE: stopped");
}
case ORANGE -> play(alert, SHORT_BEEP_PATH);
case RED -> play(alert, LONG_BEEP_PATH);
};
}
private void play(Alert alert, String audioPath) {
System.out.println(alert);
if (!audioPath.equals(service.getPlaylist().get(0))) {
if (service.statusProperty().get() != Status.PLAYING) {
System.out.println(alert + ": not being played - stopping");
service.stop();
System.out.println(alert + ": not being played - stopped");
}
System.out.println(alert + ": setting");
service.getPlaylist().set(0, audioPath);
System.out.println(alert + ": set");
}
System.out.println(alert + ": playing");
service.play();
System.out.println(alert + ": played");
}
}
The code switches between audio files to play based on the input it gets. void alert(Alert alert) is called about once per second. After a while, the app crashes on Android.
One time the crash produced this output with adb logcat -v brief -v color GraalCompiled:V GraalActivity:V GraalGluon:V GluonAttach:V AndroidRuntime:E ActivityManager:W *:S:
E/AndroidRuntime(29381): FATAL EXCEPTION: main
E/AndroidRuntime(29381): Process: com.gps.demo, PID: 29381
E/AndroidRuntime(29381): java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.setSurface(android.view.Surface)' on a null object reference
E/AndroidRuntime(29381): at com.gluonhq.helloandroid.DalvikVideoService.onSurfaceTextureAvailable(DalvikVideoService.java:381)
E/AndroidRuntime(29381): at android.view.TextureView.getHardwareLayer(TextureView.java:390)
E/AndroidRuntime(29381): at android.view.TextureView.draw(TextureView.java:339)
E/AndroidRuntime(29381): at android.view.View.updateDisplayListIfDirty(View.java:19315)
E/AndroidRuntime(29381): at android.view.View.draw(View.java:20093)
E/AndroidRuntime(29381): at android.view.ViewGroup.drawChild(ViewGroup.java:4421)
E/AndroidRuntime(29381): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4207)
E/AndroidRuntime(29381): at android.view.View.draw(View.java:20373)
E/AndroidRuntime(29381): at android.view.View.updateDisplayListIfDirty(View.java:19315)
E/AndroidRuntime(29381): at android.view.View.draw(View.java:20093)
E/AndroidRuntime(29381): at android.view.ViewGroup.drawChild(ViewGroup.java:4421)
E/AndroidRuntime(29381): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4207)
E/AndroidRuntime(29381): at android.view.View.draw(View.java:20373)
E/AndroidRuntime(29381): at com.android.internal.policy.DecorView.draw(DecorView.java:980)
E/AndroidRuntime(29381): at android.view.View.updateDisplayListIfDirty(View.java:19315)
E/AndroidRuntime(29381): at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:686)
E/AndroidRuntime(29381): at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:692)
E/AndroidRuntime(29381): at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:800)
E/AndroidRuntime(29381): at android.view.ViewRootImpl.draw(ViewRootImpl.java:3496)
E/AndroidRuntime(29381): at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:3283)
E/AndroidRuntime(29381): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2818)
E/AndroidRuntime(29381): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1780)
E/AndroidRuntime(29381): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7827)
E/AndroidRuntime(29381): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
E/AndroidRuntime(29381): at android.view.Choreographer.doCallbacks(Choreographer.java:723)
E/AndroidRuntime(29381): at android.view.Choreographer.doFrame(Choreographer.java:658)
E/AndroidRuntime(29381): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
E/AndroidRuntime(29381): at android.os.Handler.handleCallback(Handler.java:789)
E/AndroidRuntime(29381): at android.os.Handler.dispatchMessage(Handler.java:98)
E/AndroidRuntime(29381): at android.os.Looper.loop(Looper.java:164)
E/AndroidRuntime(29381): at android.app.ActivityThread.main(ActivityThread.java:6944)
E/AndroidRuntime(29381): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(29381): at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
E/AndroidRuntime(29381): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
W/ActivityManager( 1525): crash : com.gps.demo,0
W/ActivityManager( 1525): Force finishing activity com.gps.demo/com.gluonhq.helloandroid.MainActivity
When trying to look deeper with adb logcat -v color a couple of times, I got the crash detailed here: https://pastebin.com/2dLmHaQX (the log is too long to post here).
It seems that at some point the video service enters an illegal state. I did not get a crash when using AudioService, but that service does not allow changing the volume with the volume keys.
Using
<gluonfx-maven-plugin-version>1.0.15</gluonfx-maven-plugin-version>
<java-version>17</java-version>
<javafx-version>19</javafx-version>
<charm-version>6.2.2</charm-version>
<attach-version>4.0.15</attach-version>
With javafxStaticSdkVersion 19 and using graalvm-svm-java17-linux-gluon-22.1.0.1-Final.
Running on Android 8 through 12.
Related
I am working on an App that use camera for face recognition. But i have some problem when i resume my app the the app always crash.
This is my code Onresume Activity:
#Override
public synchronized void onResume() {
// LOGGER.d("onResume " + this);
super.onResume();;
handlerThread = new HandlerThread("inference");
handlerThread.start();
handler = new Handler(handlerThread.getLooper());
}
This is my code in CameraActivity:
CameraActivity.java
And this is the class that i used for recognize the face that extends from cameraActivity:
Detector Activity
I forgot to show the erorr:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.samples.flironecamera, PID: 30923
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.samples.flironecamera.tracking.MultiBoxTracker.trackResults(java.util.List, long)' on a null object reference
at com.samples.flironecamera.DetectorActivity.updateResults(DetectorActivity.java:728)
at com.samples.flironecamera.DetectorActivity.onRestart(DetectorActivity.java:761)
at android.app.Instrumentation.callActivityOnRestart(Instrumentation.java:1443)
at android.app.Activity.performRestart(Activity.java:8067)
at android.app.ActivityThread.performRestartActivity(ActivityThread.java:5188)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:243)
at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2270)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:8125)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)
And Another Erorr
java.lang.RuntimeException: Unable to resume activity {com.samples.flironecamera/com.samples.flironecamera.DetectorActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.hardware.Camera.startPreview()' on a null object reference
Here is the java, it lists no errors when running, I am trying to make the text change every 5 seconds, however app keeps closing and wants me to reopen it.
package cross.and.sword.ptsdp;
import android.os.Bundle;
import android.support.wearable.activity.WearableActivity;
import android.widget.TextView;
public class MainActivity extends WearableActivity {
private TextView mTextView= (TextView) findViewById(R.id.WelText);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = (TextView) findViewById(R.id.text);
// Enables Always-on
setAmbientEnabled();
final TextView textView=(TextView) findViewById(R.id.WelText);
Thread t = new Thread(){
#Override
public void run(){
boolean processing = true;
int number_processed=0;
do {
mTextView.setText("Text 1");
try {
Thread.sleep(500);
if (++number_processed>6)
processing=false;
} catch (InterruptedException e) {
e.printStackTrace( );
} finally {
mTextView.setText("Text 2");
}
} while(processing);
mTextView.setText("Text3");
}
};
};
}
11/28 18:47:36: Launching MainActivity
$ adb install-multiple -r -t C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_1.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_7.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\dep\dependencies.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_6.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\resources\instant-run\debug\resources-debug.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_5.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_0.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_3.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_2.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_9.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_4.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\split-apk\debug\slices\slice_8.apk C:\Users\Howard\AndroidStudioProjects\PTSDP\app\build\intermediates\instant-run-apk\debug\app-debug.apk
Split APKs installed in 10 s 353 ms
$ adb shell am start -n "cross.and.sword.ptsdp/cross.and.sword.ptsdp.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Waiting for process to come online
Waiting for process to come online
Connected to process 2497 on device Android_Wear_Round_API_26 [emulator-5554]
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/zygote: Not late-enabling -Xcheck:jni (already on)
W/zygote: Unexpected CPU variant for X86 using defaults: x86
I/InstantRun: starting instant run server: is main process
D/AndroidRuntime: Shutting down VM
--------- beginning of crash
E/AndroidRuntime: FATAL EXCEPTION: main
Process: cross.and.sword.ptsdp, PID: 2497
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{cross.and.sword.ptsdp/cross.and.sword.ptsdp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2718)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
at android.app.Activity.findViewById(Activity.java:2563)
at cross.and.sword.ptsdp.MainActivity.(MainActivity.java:9)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1173)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2708)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
I am trying to scale a bitmap image. However, when I scale it, I get an error. This is my full stack trace:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nodomain.speedtap2, PID: 3113
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nodomain.speedtap2/com.nodomain.speedtap2.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.Bitmap.setHasAlpha(boolean)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3322)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3418)
at android.app.ActivityThread.access$1100(ActivityThread.java:231)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1823)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7422)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.Bitmap.setHasAlpha(boolean)' on a null object reference
at android.graphics.Bitmap.createBitmap(Bitmap.java:979)
at android.graphics.Bitmap.createBitmap(Bitmap.java:946)
at android.graphics.Bitmap.createBitmap(Bitmap.java:877)
at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:753)
at com.nodomain.speedtap2.MainMenu.<init>(MainMenu.java:47)
at com.nodomain.speedtap2.MainActivity$GameView.<init>(MainActivity.java:54)
at com.nodomain.speedtap2.MainActivity.onCreate(MainActivity.java:33)
at android.app.Activity.performCreate(Activity.java:6904)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3269)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3418)
at android.app.ActivityThread.access$1100(ActivityThread.java:231)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1823)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7422)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) `
But didn't I already make a Bitmap with BitmapFactory.decodeResource(...)? This is my code:
public class MainMenu {
private Bitmap playButton;
public MainMenu (Context context) {
playButton = BitmapFactory.decodeResource(context.getResources(), R.drawable.play_button);
float aspectRatio = 421/475;
int playButtonWidth = MainActivity.screenX / 5;
int playButtonHeight = (int)(MainActivity.screenX / (aspectRatio));
playButton = Bitmap.createScaledBitmap(playButton, playButtonWidth, playButtonHeight, false);
}
Maybe I'm not fully understanding the error...
public class MainMenu {
public static Bitmap playButton;
Context mcontext;
public static Bitmap MainMenu(Context context) {
playButton = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon);
float aspectRatio = 421/475;
int playButtonWidth = MainActivity.screenX / 5;
int playButtonHeight = (int)(MainActivity.screenX / (aspectRatio));
playButton = Bitmap.createScaledBitmap(playButton, 100, 100, false);
return playButton;
}
}
the issue is that your playButtonWidth ,playButtonHeight returns null. so it crash please share how you getting MainActivity.screenX , try this
So I'm using the library Swipe by Pwittchen and the code being used is this section:
CoreActivity.java
#Override
public void onSwipedDown(final MotionEvent event) {
if(m_Toolbar.getVisibility() == View.VISIBLE ){
WebShrink.cancel();
}
//WebView Animation (Shrink)
// if(m_WebView.getAnimation().hasStarted() || m_WebView.getAnimation().hasEnded()){
if(WebEnlarge.hasStarted()){
WebShrink = AnimationUtils.loadAnimation(CoreActivity.this,R.anim.m_webview_shrink);
m_WebView.startAnimation(WebShrink);
m_Preference_Toolbar.setVisibility(View.GONE);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
m_Toolbar.setVisibility(View.VISIBLE);
}
}, 350);//3 seconds
}
}
Currently I crashes if you swipe down in the moment it is created. Im trying to find a way around it with:
if(m_Toolbar.getVisibility() == View.VISIBLE ){
WebShrink.cancel();
}
but this is not working and am wondering if anyone could help me with this. the ideal situation is that if the toolbar is visible or if WebShrink is already in place then do nothing but I can't find away around it
LogCat
01-18 20:57:23.652 29764-29764/com.equiware.mickeyt.fire E/InputEventReceiver: Exception dispatching input event.
01-18 20:57:23.653 29764-29764/com.equiware.mickeyt.fire D/AndroidRuntime: Shutting down VM
01-18 20:57:23.654 29764-29764/com.equiware.mickeyt.fire E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.equiware.mickeyt.fire, PID: 29764
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.animation.Animation.cancel()' on a null object reference
at com.equiware.mickeyt.fire.CoreActivity$2.onSwipedDown(CoreActivity.java:161)
at com.github.pwittchen.swipe.library.rx2.Swipe.onActionUp(Swipe.java:138)
at com.github.pwittchen.swipe.library.rx2.Swipe.dispatchTouchEvent(Swipe.java:101)
at com.equiware.mickeyt.fire.CoreActivity.dispatchTouchEvent(CoreActivity.java:216)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:374)
at android.view.View.dispatchPointerEvent(View.java:10177)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4628)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4496)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4000)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3966)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3974)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4000)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3966)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4095)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3974)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4152)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4000)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3966)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3974)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6437)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6411)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6372)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6571)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:6519)
at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:6594)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:613)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6247)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.animation.Animation.cancel()' on a null object reference at com.equiware.mickeyt.fire.CoreActivity$2.onSwipedDown(CoreActivity.java:161)
Line 161 seems to be:
WebShrink.cancel();
WebShrink is probably null.
You should load the animation outside onSwipeDown method, maybe you can place this in the activity's onCreate:
WebShrink = AnimationUtils.loadAnimation(CoreActivity.this,R.anim.m_webview_shrink);
Then it will be instantiated before onSwipeDown is called.
Context
I'm working on a small test code right now. It selects an image, resizes it to fit the screen based on the screen density. While it does this, it makes a copy of the image at the size it would be in an xxhdpi display, and the converts into a Bitmap, then into a String. The String is then carried through an Intent to the next screen where the String is turned back into a Bitmap and then placed in an ImageButton.
This worked fine until I added in a chunk of code to resize the image given by the string based on the density. The odd thing is I copied and pasted the DPI() method from another activity and there were no issues in that activity.
Code
package com.example.zachary.imagetesting.Resizing;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import com.example.zachary.imagetesting.R;
public class PictureDecoded extends Activity {
TextView Text;
ImageButton Image;
String string;
Bitmap picture;
public float DPI(){return getResources().getDisplayMetrics().density;}
float dpi = DPI() * 180;
int size = (int) dpi;
public Bitmap Pic(String string){
try{
byte[] b = Base64.decode(string, Base64.DEFAULT);
Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
return bitmap;
} catch (Exception e) {
e.getMessage();
return null;
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.resizing);
string = getIntent().getStringExtra("String");
Image = (ImageButton) findViewById(R.id.image);
Text = (TextView) findViewById(R.id.text);
picture = Pic(string);
Image.setImageBitmap(Bitmap.createScaledBitmap(picture,size,size,false));
}
public void next(View view){ }
// I also tried addring DPI() here as well to no success.
//public float DPI(){return getResources().getDisplayMetrics().density;}
}
Error Log
01-15 19:55:17.104 30570-30570/com.example.zachary.imagetesting D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
01-15 19:55:17.194 30570-30570/com.example.zachary.imagetesting E/Bitmap String:: /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB
AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB
AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCAGVAhwDASIA
AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA
AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3
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01-15 19:55:17.194 30570-30570/com.example.zachary.imagetesting I/Timeline: Timeline: Activity_launch_request id:com.example.zachary.imagetesting time:50420468
01-15 19:55:17.244 30570-30570/com.example.zachary.imagetesting D/AndroidRuntime: Shutting down VM
01-15 19:55:17.244 30570-30570/com.example.zachary.imagetesting E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.zachary.imagetesting, PID: 30570
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.zachary.imagetesting/com.example.zachary.imagetesting.Resizing.PictureDecoded}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2546)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
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:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.content.ContextWrapper.getResources(ContextWrapper.java:90)
at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:74)
at com.example.zachary.imagetesting.Resizing.PictureDecoded.DPI(PictureDecoded.java:20)
at com.example.zachary.imagetesting.Resizing.PictureDecoded.<init>(PictureDecoded.java:21)
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.Class.newInstance(Class.java:1650)
at android.app.Instrumentation.newActivity(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2536)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
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:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
The large block of text is the String converted from Bitmap that was passed to the Activity. I left it in just in case it was useful. The line before the large block of text was the button click that started the intent to the activity which crashes due to NullPointerException.
I can add the other activities on request, but since it worked before I tried resizing based on screen density I didn't feel it was needed.
An Activity's base Context won't have been setup until after onCreate() has finished executing. Simply move the initialization of dpi to onCreate() after super.onCreate() has been called.