Develop Reference

My app quits as soon as picture is selected

I have created an app that basically takes a picture and saves it to the gallery. The only problem is that after the picture is taken it takes you to the screen where you can preview it with the two buttons that say okay and cancel. Once you click okay, the app quits. The image is still saved to the gallery but I want the app to stay open. I also want the app to display a bitmap of the image on an imageView that I have.
Here is my MainActivity.java
package com.example.app;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.FileProvider;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity { <- Line 22
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dispatchTakePictureIntent(); <- Line 34
}
});
}
static final int REQUEST_IMAGE_CAPTURE = 1;
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
// I AM UNSURE WHAT CODE TO PUT HERE. DOES ANYONE KNOW WHAT I SHOULD BE PUTTING HERE?
}
// Continue only if the File was successfully created
if (photoFile != null) {
//This is where the error is occurring but I do not know why.
Line 56 -> Uri photoURI = FileProvider.getUriForFile(this, "com.example.app", photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ImageView imageView = findViewById(R.id.imageView);
imageView.setImageBitmap(imageBitmap);
}
}
String currentPhotoPath;
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
currentPhotoPath = image.getAbsolutePath();
return image;
}
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(currentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
}
Here is my error message
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.app, PID: 22357
java.lang.IllegalArgumentException: Couldn't find meta-data for provider with authority com.example.app
at androidx.core.content.FileProvider.parsePathStrategy(FileProvider.java:606)
at androidx.core.content.FileProvider.getPathStrategy(FileProvider.java:579)
at androidx.core.content.FileProvider.getUriForFile(FileProvider.java:417)
--> at com.example.app.MainActivity.dispatchTakePictureIntent(MainActivity.java:56)
--> at com.example.app.MainActivity.access$000(MainActivity.java:22)
--> at com.example.app.MainActivity$1.onClick(MainActivity.java:34)
at android.view.View.performClick(View.java:7870)
at android.widget.TextView.performClick(TextView.java:14966)
at android.view.View.performClickInternal(View.java:7839)
at android.view.View.access$3600(View.java:886)
at android.view.View$PerformClick.run(View.java:29315)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7777)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1047)
I/Process: Sending signal. PID: 22357 SIG: 9

Google Drive API and Android Studio - Uploading Video File from Android Phone to Users Google Drive

I am trying to develop an app where the user takes a photo and uploads it to Google Drive automatically (The image is not saved on the phone). I figured out the code for that thanks to a Google Drive tutorial, but I have no idea how I would do that when it comes to upload videoes?
Here is the code for photo uploading:
package com.google.android.gms.drive.sample.quickstart;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentSender;
import android.content.IntentSender.SendIntentException;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.drive.Drive;
import com.google.android.gms.drive.DriveApi.DriveContentsResult;
import com.google.android.gms.drive.MetadataChangeSet;
/**
* Android Drive Quickstart activity. This activity takes a photo and saves it
* in Google Drive. The user is prompted with a pre-made dialog which allows
* them to choose the file location.
*/
public class VideoCapture extends Activity implements ConnectionCallbacks,
OnConnectionFailedListener {
private static final String TAG = "drive-quickstart";
private static final int REQUEST_CODE_CAPTURE_VIDEO = 1;
private static final int REQUEST_CODE_CREATOR = 2;
private static final int REQUEST_CODE_RESOLUTION = 3;
private GoogleApiClient mGoogleApiClient;
private Byte mVideoToSave;
/**
* Create a new file and save it to Drive.
*/
private void saveFileToDrive() {
// Start by creating a new contents, and setting a callback.
Log.i(TAG, "Creating new contents.");
final Byte video = mVideoToSave;
Drive.DriveApi.newDriveContents(mGoogleApiClient)
.setResultCallback(new ResultCallback<DriveContentsResult>() {
#Override
public void onResult(DriveContentsResult result) {
// If the operation was not successful, we cannot do anything
// and must
// fail.
if (!result.getStatus().isSuccess()) {
Log.i(TAG, "Failed to create new contents.");
return;
}
// Otherwise, we can write our data to the new contents.
Log.i(TAG, "New contents created.");
// Get an output stream for the contents.
OutputStream outputStream = result.getDriveContents().getOutputStream();
// Write the bitmap data from it.
ByteArrayOutputStream mBAOS = new ByteArrayOutputStream();
byte[] mByte = new byte[1024];
try {
outputStream.write(mBAOS.toByteArray());
} catch (IOException e1) {
Log.i(TAG, "Unable to write file contents.");
}
// Create the initial metadata - MIME type and title.
// Note that the user will be able to change the title later.
MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
.setMimeType("video/mp4").setTitle("Android Video.mp4").build();
// Create an intent for the file chooser, and start it.
IntentSender intentSender = Drive.DriveApi
.newCreateFileActivityBuilder()
.setInitialMetadata(metadataChangeSet)
.setInitialDriveContents(result.getDriveContents())
.build(mGoogleApiClient);
try {
startIntentSenderForResult(
intentSender, REQUEST_CODE_CREATOR, null, 0, 0, 0);
} catch (SendIntentException e) {
Log.i(TAG, "Failed to launch file chooser.");
}
}
});
}
#Override
protected void onResume() {
super.onResume();
if (mGoogleApiClient == null) {
// Create the API client and bind it to an instance variable.
// We use this instance as the callback for connection and connection
// failures.
// Since no account name is passed, the user is prompted to choose.
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
// Connect the client. Once connected, the camera is launched.
mGoogleApiClient.connect();
}
#Override
protected void onPause() {
if (mGoogleApiClient != null) {
mGoogleApiClient.disconnect();
}
super.onPause();
}
#Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
switch (requestCode) {
case REQUEST_CODE_CAPTURE_VIDEO:
// Called after a photo has been taken.
if (resultCode == Activity.RESULT_OK) {
// Store the image data as a bitmap for writing later.
mVideoToSave = (Byte) data.getExtras().get("data");
}
break;
case REQUEST_CODE_CREATOR:
// Called after a file is saved to Drive.
if (resultCode == RESULT_OK) {
Log.i(TAG, "Image successfully saved.");
mVideoToSave = null;
// Just start the camera again for another photo.
startActivityForResult(new Intent(MediaStore.ACTION_VIDEO_CAPTURE),
REQUEST_CODE_CAPTURE_VIDEO);
}
break;
}
}
#Override
public void onConnectionFailed(ConnectionResult result) {
// Called whenever the API client fails to connect.
Log.i(TAG, "GoogleApiClient connection failed: " + result.toString());
if (!result.hasResolution()) {
// show the localized error dialog.
GoogleApiAvailability.getInstance().getErrorDialog(this, result.getErrorCode(), 0).show();
return;
}
// The failure has a resolution. Resolve it.
// Called typically when the app is not yet authorized, and an
// authorization
// dialog is displayed to the user.
try {
result.startResolutionForResult(this, REQUEST_CODE_RESOLUTION);
} catch (SendIntentException e) {
Log.e(TAG, "Exception while starting resolution activity", e);
}
}
#Override
public void onConnected(Bundle connectionHint) {
Log.i(TAG, "API client connected.");
if (mVideoToSave == null) {
// This activity has no UI of its own. Just start the camera.
startActivityForResult(new Intent(MediaStore.ACTION_VIDEO_CAPTURE),
REQUEST_CODE_CAPTURE_VIDEO);
return;
}
saveFileToDrive();
}
#Override
public void onConnectionSuspended(int cause) {
Log.i(TAG, "GoogleApiClient connection suspended");
}
}

Use Eddystone Beacon to Show notification in Android Status Bar

I've been able to successfully create an app (thanks davidgyoung!) that monitors beacons in the background and then subsequently opens the app in the background.
Now I would like my app to first prompt with a notification in the status bar saying something like "I've detected a beacon! Would you like to open out app?". Then the user would click on the notification to open the app or dismiss it and ignore the notification.
I've searched on stack overflow for something like but haven't had much success in finding something relevant to beacons. I did find this page that talks about adding StatusBar notifications but I'm not having much success.
Particularly its in my BeaconReferenceApplication.java and MonitoringActivity.java file. I think I put the code in the correct place (after didEnterRegion) but I have unresolved classes for areas like notificationButton, setLatestEventInfo, etc. Can someone help? Thanks in advance!
BeaconReferenceApplication.java:
import android.app.Application;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.TaskStackBuilder;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import org.altbeacon.beacon.BeaconManager;
import org.altbeacon.beacon.BeaconParser;
import org.altbeacon.beacon.Identifier;
import org.altbeacon.beacon.Region;
import org.altbeacon.beacon.powersave.BackgroundPowerSaver;
import org.altbeacon.beacon.startup.RegionBootstrap;
import org.altbeacon.beacon.startup.BootstrapNotifier;
public class BeaconReferenceApplication extends Application implements BootstrapNotifier {
private static final String TAG = "BeaconReferenceApp";
private RegionBootstrap regionBootstrap;
private BackgroundPowerSaver backgroundPowerSaver;
private boolean haveDetectedBeaconsSinceBoot = false;
private MonitoringActivity monitoringActivity = null;
public void onCreate() {
super.onCreate();
BeaconManager beaconManager = org.altbeacon.beacon.BeaconManager.getInstanceForApplication(this);
// By default the AndroidBeaconLibrary will only find AltBeacons. If you wish to make it
// find a different type of beacon, you must specify the byte layout for that beacon's
// advertisement with a line like below. The example shows how to find a beacon with the
// same byte layout as AltBeacon but with a beaconTypeCode of 0xaabb. To find the proper
// layout expression for other beacon types, do a web search for "setBeaconLayout"
// including the quotes.
//
beaconManager.getBeaconParsers().clear();
beaconManager.getBeaconParsers().add(new BeaconParser().
setBeaconLayout("s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19"));
Log.d(TAG, "setting up background monitoring for beacons and power saving");
// wake up the app when a beacon is seen
Region region = new Region("backgroundRegion", Identifier.parse("2F234454F4911BA9FFA6"), null, null);
regionBootstrap = new RegionBootstrap(this, region);
// simply constructing this class and holding a reference to it in your custom Application
// class will automatically cause the BeaconLibrary to save battery whenever the application
// is not visible. This reduces bluetooth power usage by about 60%
backgroundPowerSaver = new BackgroundPowerSaver(this);
// If you wish to test beacon detection in the Android Emulator, you can use code like this:
// BeaconManager.setBeaconSimulator(new TimedBeaconSimulator() );
// ((TimedBeaconSimulator) BeaconManager.getBeaconSimulator()).createTimedSimulatedBeacons();
}
#Override
public void didEnterRegion(Region arg0) {
// In this example, this class sends a notification to the user whenever a Beacon
// matching a Region (defined above) are first seen.
Log.d(TAG, "did enter region.");
if (!haveDetectedBeaconsSinceBoot) {
Log.d(TAG, "sending notification to StatusBar");
#SuppressWarnings("deprecation")
private void Notify(String notificationTitle, String notificationMessage) {
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
#SuppressWarnings("deprecation")
Notification notification = new Notification(R.mipmap.ic_launcher,
"New Message", System.currentTimeMillis());
Intent notificationIntent = new Intent(this, MonitoringActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
notification.setLatestEventInfo(MonitoringActivity.this, notificationTitle,
notificationMessage, pendingIntent);
notificationManager.notify(9999, notification);
}
}
} else {
if (monitoringActivity != null) {
Log.d(TAG, "auto launching MainActivity");
// The very first time since boot that we detect an beacon, we launch the
// MainActivity
Intent intent = new Intent(this, MonitoringActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Important: make sure to add android:launchMode="singleInstance" in the manifest
// to keep multiple copies of this activity from getting created if the user has
// already manually launched the app.
this.startActivity(intent);
haveDetectedBeaconsSinceBoot = true;
}
}
}
#Override
public void didExitRegion(Region region) {
if (monitoringActivity != null) {
Log.d(TAG,"I no longer see a beacon.");
}
}
#Override
public void didDetermineStateForRegion(int state, Region region) {
if (monitoringActivity != null) {
Log.d(TAG,"I have just switched from seeing/not seeing beacons: " + state);
}
}
private void sendNotification() {
NotificationCompat.Builder builder =
new NotificationCompat.Builder(this)
.setContentTitle("Beacon Reference Application")
.setContentText("An beacon is nearby.")
.setSmallIcon(R.mipmap.ic_launcher);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addNextIntent(new Intent(this, MonitoringActivity.class));
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
builder.setContentIntent(resultPendingIntent);
NotificationManager notificationManager =
(NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1, builder.build());
}
public void setMonitoringActivity(MonitoringActivity activity) {
this.monitoringActivity = activity;
}
}
MonitoringActivity.java:
import android.Manifest;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import org.altbeacon.beacon.BeaconManager;
public class MonitoringActivity extends Activity {
protected static final String TAG = "MonitoringActivity";
private static final int PERMISSION_REQUEST_COARSE_LOCATION = 1;
private WebView mWebView;
ProgressBar progressBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_monitoring);
// code for button notification
Button notificationButton = (Button) findViewById(R.id.notificationButton);
notificationButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Notify("Title: Meeting with Business",
"Msg:Pittsburg 10:00 AM EST ");
}
});
// code for button notification
mWebView = (WebView) findViewById(R.id.activity_main_webview);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.loadUrl("http://communionchapelefca.org/edy-home");
mWebView.setWebViewClient(new MyAppWebViewClient());
verifyBluetooth();
Log.d(TAG, "Application just launched");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// Android M Permission check
if (this.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("This app needs location access");
builder.setMessage("Please grant location access so this app can detect beacons in the background.");
builder.setPositiveButton(android.R.string.ok, null);
builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
#TargetApi(23)
#Override
public void onDismiss(DialogInterface dialog) {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
PERMISSION_REQUEST_COARSE_LOCATION);
}
});
builder.show();
}
}
}
private class HelloWebViewClient extends WebViewClient{
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}
#Override
public boolean shouldOverrideUrlLoading(WebView webView, String url)
{
webView.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
progressBar.setVisibility(view.GONE);
}
}
#Override
public void onBackPressed() {
if(mWebView.canGoBack()) {
mWebView.goBack();
} else {
super.onBackPressed();
}
}
#Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_COARSE_LOCATION: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.d(TAG, "coarse location permission granted");
} else {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Functionality limited");
builder.setMessage("Since location access has not been granted, this app will not be able to discover beacons when in the background.");
builder.setPositiveButton(android.R.string.ok, null);
builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
#Override
public void onDismiss(DialogInterface dialog) {
}
});
builder.show();
}
return;
}
}
}
public void onRangingClicked(View view) {
Intent myIntent = new Intent(this, RangingActivity.class);
this.startActivity(myIntent);
}
#Override
public void onResume() {
super.onResume();
((BeaconReferenceApplication) this.getApplicationContext()).setMonitoringActivity(this);
}
#Override
public void onPause() {
super.onPause();
((BeaconReferenceApplication) this.getApplicationContext()).setMonitoringActivity(null);
}
private void verifyBluetooth() {
try {
if (!BeaconManager.getInstanceForApplication(this).checkAvailability()) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Bluetooth not enabled");
builder.setMessage("Please enable bluetooth in settings and restart this application.");
builder.setPositiveButton(android.R.string.ok, null);
builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
#Override
public void onDismiss(DialogInterface dialog) {
finish();
System.exit(0);
}
});
builder.show();
}
}
catch (RuntimeException e) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Bluetooth LE not available");
builder.setMessage("Sorry, this device does not support Bluetooth LE.");
builder.setPositiveButton(android.R.string.ok, null);
builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
#Override
public void onDismiss(DialogInterface dialog) {
finish();
System.exit(0);
}
});
builder.show();
}
}
}

So I was able to fix my problem by using the example from the Android Developers website for Notifications. I used their sample code, adapted it to my use, and then even further used .bigText to make my notification look great. Credit goes to them and daviggyoung for getting my app working. Thanks!
I also didnt need to edit my MonitoringActivity.java like I posted earlier.
final BeaconReferenceApplication.java:
import android.app.Application;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.TaskStackBuilder;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.RemoteViews;
import org.altbeacon.beacon.BeaconManager;
import org.altbeacon.beacon.BeaconParser;
import org.altbeacon.beacon.Identifier;
import org.altbeacon.beacon.Region;
import org.altbeacon.beacon.powersave.BackgroundPowerSaver;
import org.altbeacon.beacon.startup.RegionBootstrap;
import org.altbeacon.beacon.startup.BootstrapNotifier;
public class BeaconReferenceApplication extends Application implements BootstrapNotifier {
private static final String TAG = "BeaconReferenceApp";
private RegionBootstrap regionBootstrap;
private BackgroundPowerSaver backgroundPowerSaver;
private boolean haveDetectedBeaconsSinceBoot = false;
private MonitoringActivity monitoringActivity = null;
public void onCreate() {
super.onCreate();
BeaconManager beaconManager = org.altbeacon.beacon.BeaconManager.getInstanceForApplication(this);
// By default the AndroidBeaconLibrary will only find AltBeacons. If you wish to make it
// find a different type of beacon, you must specify the byte layout for that beacon's
// advertisement with a line like below. The example shows how to find a beacon with the
// same byte layout as AltBeacon but with a beaconTypeCode of 0xaabb. To find the proper
// layout expression for other beacon types, do a web search for "setBeaconLayout"
// including the quotes.
//
beaconManager.getBeaconParsers().clear();
beaconManager.getBeaconParsers().add(new BeaconParser().
setBeaconLayout("s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19"));
Log.d(TAG, "setting up background monitoring for beacons and power saving");
// wake up the app when a beacon is seen
Region region = new Region("backgroundRegion", Identifier.parse("2F234454F4911BA9FFA6"), null, null);
regionBootstrap = new RegionBootstrap(this, region);
// simply constructing this class and holding a reference to it in your custom Application
// class will automatically cause the BeaconLibrary to save battery whenever the application
// is not visible. This reduces bluetooth power usage by about 60%
backgroundPowerSaver = new BackgroundPowerSaver(this);
// If you wish to test beacon detection in the Android Emulator, you can use code like this:
// BeaconManager.setBeaconSimulator(new TimedBeaconSimulator() );
// ((TimedBeaconSimulator) BeaconManager.getBeaconSimulator()).createTimedSimulatedBeacons();
}
#Override
public void didEnterRegion(Region arg0) {
// In this example, this class sends a notification to the user whenever a Beacon
// matching a Region (defined above) are first seen.
Log.d(TAG, "did enter region.");
if (!haveDetectedBeaconsSinceBoot) {
Log.d(TAG, "sending notification to StatusBar");
//begin code for notification
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("Message from Communion Chapel")
.setContentText("Welcome! Thanks for coming!")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText("We noticed that you're here today, click here to open the app and get today's Sermon Notes and Bulletin."))
.setAutoCancel(true);
;
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, MonitoringActivity.class);
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MonitoringActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// mId allows you to update the notification later on.
mNotificationManager.notify(123, mBuilder.build());
}
}
#Override
public void didExitRegion(Region region) {
if (monitoringActivity != null) {
Log.d(TAG,"I no longer see a beacon.");
}
}
#Override
public void didDetermineStateForRegion(int state, Region region) {
if (monitoringActivity != null) {
Log.d(TAG,"I have just switched from seeing/not seeing beacons: " + state);
}
}
private void sendNotification() {
NotificationCompat.Builder builder =
new NotificationCompat.Builder(this)
.setContentTitle("Beacon Reference Application")
.setContentText("A beacon is nearby.")
.setSmallIcon(R.drawable.app_icon);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addNextIntent(new Intent(this, MonitoringActivity.class));
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
builder.setContentIntent(resultPendingIntent);
NotificationManager notificationManager =
(NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1, builder.build());
}
public void setMonitoringActivity(MonitoringActivity activity) {
this.monitoringActivity = activity;
}
}

Android Java: Modification of instance variable inside button click handler

There is a strange behaviour of assigning/modifying instance variable of the class inside Button OnClick() handlers.
As shown below, the instance variable "CurrentFile" is modified inside imgBtn.setOnClickListener() handlers. But when this variable is accessed in onActivityResult() method, this variable contains the value "null".
According to my understanding, the activity "GetPicActivity" will not be destroyed till the Camera activity returns. So, the instance variable "CurrentFile" should not be null.
Please help, if I am missing some basics.
import java.io.File;
import java.io.IOException;
import com.favoritepics.R;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.drawable.ColorDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;
public class GetPicActivity extends Activity {
protected static final int ID_REQ_IMAGE_CAPTURE = 1;
protected static final int ID_REQ_PICK_PHOTO = 0;
protected File currentFile = null; /// Goal is "to modify this variable inside Button onClick handlers"
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setBackgroundDrawable(
new ColorDrawable(android.graphics.Color.DKGRAY));
setContentView(R.layout.activity_get_pic);
// set handler image gallery
ImageButton imgBtn = (ImageButton) findViewById(R.id.imgGallery);
imgBtn.setOnClickListener(new ImageButton.OnClickListener() {
#Override
public void onClick(View v) {
// create intent to take picture on camera
Intent pickPhoto = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhoto, ID_REQ_PICK_PHOTO);
}
});
// set handler for camera image
imgBtn = (ImageButton) findViewById(R.id.imgCamera);
imgBtn.setOnClickListener(new ImageButton.OnClickListener() {
#Override
public void onClick(View v) {
Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File tempDir = Environment.getExternalStorageDirectory();
File tempFile = null;
try {
currentFile = File
.createTempFile("_jpeg_", ".jpg", tempDir);
} catch (IOException exception) {
Toast.makeText(
GetPicActivity.this,
"Problem occured during creation of temp file! "
+ exception.getMessage(),
Toast.LENGTH_SHORT).show();
}
if (currentFile != null) {
takePicture.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(currentFile));
startActivityForResult(takePicture, ID_REQ_IMAGE_CAPTURE);
}
}
});
// set handler for cancel button
Button btnCancel = (Button) findViewById(R.id.btnCancel);
btnCancel.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case ID_REQ_IMAGE_CAPTURE:
if (resultCode == RESULT_OK) {
Intent newIntent = new Intent();
newIntent.putExtra("TYPE", requestCode);
newIntent.putExtra("PATH", currentFile.getAbsolutePath());
setResult(RESULT_OK, newIntent);
finish();
}
break;
default:
break;
}
}
}
click here to see Logcat messages
Steps what I intend to do:
1, Create a temporary file in External storage for the destination of Camera picture
2, Start Camera to take a picture by passing the URI of temporary file
3, OnActivityResult() from camera, return the (temporary) File path to previous activity for further process
But here what I see is,
As soon as the Camera is started & picture is taken, the GetPicActivity is created again. Because of this, the instance variable "CurrentFile" will be null & in OnActivityResult() , I could not get the File path of temporary file.
Why is the GetPicActivity destroyed after starting Camera?

When the camera is started, the Camera appears in the screen orientation "Landscape".
Even the orientation of already existing activity stack is changed to "Landscape" itseems.
So, When the result of Camera is returned to GetPicActivity method OnActivityResult(), the GetPicActivity is created again. But now, the instance variable "CurrentFile" is null. This, gives a NullPointerException.

Zxing barcode matching app for android

I'm trying to develop an app which will scan a barcode, store the value in a variable, then scan another barcode and match that value with the previous value and return a 'match' or 'no match' result. I have already got the first part working thanks to help from foamyguy, here's the initial code that I used,
package com.barcodesample;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class BarcodeSample extends Activity {
private Button scanBtn;
private TextView resultsTxt;
/** Called when the activity is first created. */;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
scanBtn = (Button) findViewById(R.id.scanBtn);
resultsTxt = (TextView) findViewById(R.id.resultsTxt);
scanBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
resultsTxt.setText("Scanning...");
Intent intent = new intent("com.google.zxing.client.android.SCAN");
try {
startActivityForResult(intent, 0);
} catch (ActivityNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
new AlertDialog.Builder(v.getContext())
.setTitle("WARNING:")
.setMessage("You don't have Barcode Scanner installed. Please install it.")
.setCancelable(false)
.setNeutralButton("Install it now", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Uri uri = Uri.parse("market://search?q=pname:com.google.zxing.client.android");
startActivity(new Intent(Intent.ACTION_VIEW, uri));
}
})
.show();
}
}
});
}
/*Here is where we come back after the Barcode Scanner is done*/
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
// contents contains whatever the code was
String contents = intent.getStringExtra("SCAN_RESULT");
// Format contains the type of code i.e. UPC, EAN, QRCode etc...
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
// Handle successful scan. In this example I just put the results into the TextView
resultsTxt.setText(format + "\n" + contents);
} else if (resultCode == RESULT_CANCELED) {
// Handle cancel. If the user presses 'back' before a code is scanned.
resultsTxt.setText("Canceled");
}
}
}
}
Now how do I start another intent with another scan button similar to the one above, and finally how to compare both values and return the match or no match in a new screen?
Thanks in advance for the valuable advice

Use the same code on the other button except following.
startActivityForResult(intent, 1); // right now it's 0 for button 1
Now add one more section in onActivityResult for returning results for 2nd button.
if (requestCode == 1) {
// your code here that will be used for comparing.
}