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PONull pointer exception when scaling down bitmap
 

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  1. PONull pointer exception when scaling down bitmap
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    <p>I have an imageView, that fills with an image selected from the gallery by the user. This image is then used to set the background of another activity when a button called "set background" is clicked. When I choose the image, it shows in the imageView, but when I press the "set background" button, I get a NPE when I scale down the bitmap. Here is the error:</p> <pre><code>11-22 21:21:14.174: D/AndroidRuntime(24601): Shutting down VM 11-22 21:21:14.194: E/AndroidRuntime(24601): FATAL EXCEPTION: main 11-22 21:21:14.194: E/AndroidRuntime(24601): java.lang.NullPointerException 11-22 21:21:14.194: E/AndroidRuntime(24601): at com.example.awesomefilebuilderwidget.Personalize.scaleDownBitmap(Personalize.java:119) 11-22 21:21:14.194: E/AndroidRuntime(24601): at com.example.awesomefilebuilderwidget.Personalize.setBackgroundImageInDragAndDrop(Personalize.java:143) 11-22 21:21:14.194: E/AndroidRuntime(24601): at com.example.awesomefilebuilderwidget.Personalize.onClick(Personalize.java:88) 11-22 21:21:14.194: E/AndroidRuntime(24601): at android.view.View.performClick(View.java:2532) 11-22 21:21:14.194: E/AndroidRuntime(24601): at android.view.View$PerformClick.run(View.java:9308) 11-22 21:21:14.194: E/AndroidRuntime(24601): at android.os.Handler.handleCallback(Handler.java:587) 11-22 21:21:14.194: E/AndroidRuntime(24601): at android.os.Handler.dispatchMessage(Handler.java:92) 11-22 21:21:14.194: E/AndroidRuntime(24601): at android.os.Looper.loop(Looper.java:150) 11-22 21:21:14.194: E/AndroidRuntime(24601): at android.app.ActivityThread.main(ActivityThread.java:4333) 11-22 21:21:14.194: E/AndroidRuntime(24601): at java.lang.reflect.Method.invokeNative(Native Method) 11-22 21:21:14.194: E/AndroidRuntime(24601): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 11-22 21:21:14.194: E/AndroidRuntime(24601): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 11-22 21:21:14.194: E/AndroidRuntime(24601): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>And here is my Personalize class:</p> <pre><code>public class Personalize extends Activity implements View.OnClickListener { Button button; ImageView image; ImageView image2; Button btnChangeImage; Button btnChangeImageForIcon; Button btnSetBackground; private static final int SELECT_PICTURE = 1; private static final int SELECT_PICTURE_2 = 2; private static final int RESULT_ICON = 20; private String selectedImagePath; Bitmap background; Bitmap b2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.personalize); Log.d("Personalize", "OnCreate called"); image = (ImageView) findViewById(R.id.imageView1); image2 = (ImageView) findViewById(R.id.imageView2Icon); Button btnChangeImage = (Button) findViewById(R.id.btnChangeImage); btnChangeImage.setOnClickListener(this); Button btnChangeImageForIcon = (Button) findViewById(R.id.btnChangeImageForIcon); btnChangeImageForIcon.setOnClickListener(this); Button btnSetBackground = (Button) findViewById(R.id.btnSetBackground); btnSetBackground.setOnClickListener(this); Button btnLinkToFeedback = (Button) findViewById(R.id.btnLinkToFeedback); Button btnSetIcon = (Button) findViewById(R.id.btnSetIcon); btnSetIcon.setOnClickListener(this); // Link to Feedback Screen btnLinkToFeedback.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { Intent i = new Intent(getApplicationContext(), Feedback.class); startActivity(i); Log.d("Personalize", "LinkToFeedBack called"); finish(); } }); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btnChangeImage: launchImageChooser(); break; case R.id.btnChangeImageForIcon: launchImageChooser2(); break; case R.id.btnSetBackground: setBackgroundImageInDragAndDrop(); break; case R.id.btnSetIcon: setIconImageInWidget(); break; } } private void setIconImageInWidget() { // TODO Auto-generated method stub Log.d("Personalize", "setIconImageInWidget() called"); Intent i = getIntent(); // Convert bitmap to byte array to send back to activity // See: // http://stackoverflow.com/questions/11010386/send-bitmap-using-intent-android scaleDownBitmapForIcon(b2, 500, this.getBaseContext()); Log.d("Personalize", "Scale Bitmap Chosen For Icon"); ByteArrayOutputStream stream = new ByteArrayOutputStream(); b2.compress(Bitmap.CompressFormat.PNG, 100, stream); byte[] byteArray = stream.toByteArray(); i.putExtra("myIconBitmap", byteArray); setResult(RESULT_ICON, i); finish(); } public static Bitmap scaleDownBitmap(Bitmap background, int newHeight, Context c) { final float densityMultiplier = c.getResources().getDisplayMetrics().density; int h = (int) (500 * densityMultiplier); int w = (int) (h * background.getWidth() / ((double) background.getHeight())); background = Bitmap.createScaledBitmap(background, w, h, true); // TO SOLVE LOOK AT // HERE:http://stackoverflow.com/questions/15517176/passing-bitmap-to-other-activity-getting-message-on-logcat-failed-binder-transac return background; } public static Bitmap scaleDownBitmapForIcon(Bitmap b2, int newHeight, Context c) { final float densityMultiplier = c.getResources().getDisplayMetrics().density; int h = (int) (500 * densityMultiplier); int w = (int) (h * b2.getWidth() / ((double) b2.getHeight())); b2 = Bitmap.createScaledBitmap(b2, w, h, true); // TO SOLVE LOOK AT // HERE:http://stackoverflow.com/questions/15517176/passing-bitmap-to-other-activity-getting-message-on-logcat-failed-binder-transac return b2; } private void setBackgroundImageInDragAndDrop() { Log.d("Personalize", "setBackgroundImageInDragAndDrop() called"); Intent i = getIntent(); // Convert bitmap to byte array to send back to activity // See: // http://stackoverflow.com/questions/11010386/send-bitmap-using-intent-android scaleDownBitmap(background, 500, this.getBaseContext()); Log.d("Personalize", "Scale Bitmap Chosen"); ByteArrayOutputStream stream = new ByteArrayOutputStream(); background.compress(Bitmap.CompressFormat.PNG, 100, stream); byte[] byteArray = stream.toByteArray(); i.putExtra("myBackgroundBitmap", byteArray); setResult(RESULT_OK, i); finish(); } private void launchImageChooser() { Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); intent.addCategory(Intent.CATEGORY_OPENABLE); startActivityForResult(intent, SELECT_PICTURE); Log.d("Personalize", "launchImageChooser called"); } private void launchImageChooser2() { Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); intent.addCategory(Intent.CATEGORY_OPENABLE); startActivityForResult(intent, SELECT_PICTURE_2); Log.d("Personalize", "launchImageChooser2 called"); } public String getPath(Uri uri) { String[] projection = { MediaStore.Images.Media.DATA }; Cursor cursor = getContentResolver().query(uri, projection, null, null, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); String imagePath = cursor.getString(column_index); if (cursor != null) { cursor.close(); } return imagePath; } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { if (requestCode == SELECT_PICTURE) { Uri selectedImageUri = data.getData(); selectedImagePath = getPath(selectedImageUri); background = getAndDecodeImage(selectedImagePath); if (background != null) { image.setImageBitmap(background); } } else if (requestCode == SELECT_PICTURE_2) { Uri selectedImageUri = data.getData(); selectedImagePath = getPath(selectedImageUri); b2 = getAndDecodeImage(selectedImagePath); if (b2 != null) { image2.setImageBitmap(b2); } } } } @Override protected void onPause() { SharedPreferences sp = getSharedPreferences("AppSharedPref", 1); // open // shared // preferences // with // name // AppSharedPref Editor editor = sp.edit(); editor.putString("ImagePath", selectedImagePath); // Store // selectedImagePath // with key // "ImagePath". This // key will be then // used to retrieve // data. editor.commit(); super.onPause(); Log.d("Personalize", "onPause() called and selectedImagePath saved"); } @Override protected void onResume() { SharedPreferences sp = getSharedPreferences("AppSharedPref", 1); selectedImagePath = sp.getString("ImagePath", ""); super.onResume(); Log.d("Personalize", "onResume() called and images uploaded"); Log.d("Personalize", "Now set the image as background"); background = getAndDecodeImage(selectedImagePath); if (background != null) { image.setImageBitmap(background); } if (b2 != null) { image2.setImageBitmap(b2); } } private Bitmap getAndDecodeImage(String selectedImagePath) { try { Log.d("Personalize", "selectedImagePath: " + selectedImagePath); FileInputStream fileis = new FileInputStream(selectedImagePath); BufferedInputStream bufferedstream = new BufferedInputStream(fileis); byte[] bMapArray = new byte[bufferedstream.available()]; bufferedstream.read(bMapArray); Bitmap bMap = BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length); if (fileis != null) { fileis.close(); } if (bufferedstream != null) { bufferedstream.close(); } return bMap; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } public boolean saveImageToInternalStorage(Bitmap image) { try { FileOutputStream fos = this.openFileOutput("desiredFilename.png", Context.MODE_PRIVATE); image.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.close(); return true; } catch (Exception e) { return false; } } } </code></pre> <p>More specifically here are lines </p> <p>119</p> <pre><code>int w= (int) (h * background.getWidth()/((double) background.getHeight())); </code></pre> <p>143</p> <pre><code>scaleDownBitmap(background, 500, this.getBaseContext()); </code></pre> <p>So apparently <code>background</code> is returning null but I can't figure out why.</p> <p>Please help!</p> <p>ADDED:</p> <p>Here is the LogCat leading up to the NPE:</p> <pre><code>11-22 21:33:37.650: D/D&amp;D(25036): LinkToPersonalize called 11-22 21:33:37.710: D/Personalize(25036): OnCreate called 11-22 21:33:37.720: D/Personalize(25036): onResume() called and images uploaded 11-22 21:33:37.720: D/Personalize(25036): Now set the image as background 11-22 21:33:37.720: D/Personalize(25036): selectedImagePath: 11-22 21:33:37.720: D/skia(25036): --- SkImageDecoder::Factory returned null 11-22 21:33:38.300: D/Personalize(25036): launchImageChooser called 11-22 21:33:38.320: D/Personalize(25036): onPause() called and selectedImagePath saved 11-22 21:33:41.593: D/Personalize(25036): selectedImagePath: /mnt/sdcard/paintjoy/112411_143853.png 11-22 21:33:41.643: D/dalvikvm(25036): GC_CONCURRENT freed 80K, 44% free 3178K/5639K, external 3701K/4622K, paused 2ms+2ms 11-22 21:33:41.673: D/dalvikvm(25036): GC_EXTERNAL_ALLOC freed &lt;1K, 44% free 3178K/5639K, external 3701K/4622K, paused 25ms 11-22 21:33:41.693: D/Personalize(25036): onResume() called and images uploaded 11-22 21:33:41.693: D/Personalize(25036): Now set the image as background 11-22 21:33:41.693: D/Personalize(25036): selectedImagePath: 11-22 21:33:41.693: D/skia(25036): --- SkImageDecoder::Factory returned null 11-22 21:33:42.654: D/Personalize(25036): setBackgroundImageInDragAndDrop() called 11-22 21:33:42.654: D/AndroidRuntime(25036): Shutting down VM </code></pre> <p>UPDATED: onActivityResult in recieving class:</p> <pre><code> @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); Log.i("Drag_and_Drop_App", "requestCode: " + requestCode + ", resultCode: " + resultCode); if(requestCode == SET_BACKGROUND &amp;&amp; resultCode == RESULT_OK){ byte[] byteArray = data.getByteArrayExtra("myBackgroundBitmap"); Bitmap myBackground = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length); setBackgroundImage(myBackground); } else if(requestCode == RESULT_ICON){ byte[] byteArray = data.getByteArrayExtra("myIconBitmap"); Bitmap myIcon = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length); setBackgroundImageForIcon(myIcon); Log.d("Drag_and_Drop_App", "Icon is set"); } } </code></pre> <p>setBackgroundImage:</p> <pre><code> @SuppressLint("NewApi") private void setBackgroundImage(Bitmap bitmap) { RelativeLayout yourBackgroundView = (RelativeLayout) findViewById(R.id.rl_drag_and_drop_app); Drawable d = new BitmapDrawable(getResources(), bitmap); if (Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.JELLY_BEAN) { yourBackgroundView.setBackgroundDrawable(d); } else { yourBackgroundView.setBackground(d); Log.d("Drag_and_Drop_App", "Background is set"); } } </code></pre> <p>setBackgroundImageForIcon:</p> <pre><code> @SuppressLint("NewApi") private void setBackgroundImageForIcon(Bitmap bitmap) { Log.d("Drag_and_Drop_App", "Icon..."); ImageView ivICON = (ImageView) findViewById(R.id.bwidgetOpen); BitmapDrawable dq = new BitmapDrawable(getResources(), bitmap); if (Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.JELLY_BEAN) { // ivICON.setImageDrawable(dq); ivICON.setImageResource(R.drawable.pattern1); } else { // ivICON.setImageDrawable(dq); ivICON.setImageResource(R.drawable.pattern1); Log.d("Drag_and_Drop_App", "Icon is set"); } } </code></pre> <p>Entire class(without irrelevant things):</p> <pre><code>package com.example.awesomefilebuilderwidget; IMPORTS public class Drag_and_Drop_App extends Activity { private static final int SET_BACKGROUND = 10; private static final int RESULT_ICON = 20; private ListView mListAppInfo; // Search EditText EditText inputSearch; public AppInfoAdapter adapter; final SwipeDetector swipeDetector = new SwipeDetector(); //For GridView private int draggedIndex = -1; private BaseAdapter adapterGV; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // set layout for the main screen setContentView(R.layout.drag_and_drop_app); public Bitmap getThumbnail(String filename) { Bitmap thumbnail = null; try { File filePath = this.getFileStreamPath(filename); FileInputStream fi = new FileInputStream(filePath); thumbnail = BitmapFactory.decodeStream(fi); } catch (Exception ex) { Log.e("getThumbnail() on internal storage", ex.getMessage()); } return thumbnail; } public String getPath(Uri uri) { String[] projection = { MediaStore.Images.Media.DATA }; Cursor cursor = getContentResolver().query(uri, projection, null, null, null); int column_index = cursor .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); String imagePath = cursor.getString(column_index); if(cursor != null) { cursor.close(); } return imagePath; } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); Log.i("Drag_and_Drop_App", "requestCode: " + requestCode + ", resultCode: " + resultCode); if(requestCode == SET_BACKGROUND &amp;&amp; resultCode == RESULT_OK){ byte[] byteArray = data.getByteArrayExtra("myBackgroundBitmap"); Bitmap myBackground = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length); setBackgroundImage(myBackground); } else if(requestCode == RESULT_ICON){ byte[] byteArray = data.getByteArrayExtra("myIconBitmap"); Bitmap myIcon = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length); setBackgroundImageForIcon(myIcon); Log.d("Drag_and_Drop_App", "Icon is set"); } } @SuppressLint("NewApi") private void setBackgroundImage(Bitmap bitmap) { RelativeLayout yourBackgroundView = (RelativeLayout) findViewById(R.id.rl_drag_and_drop_app); Drawable d = new BitmapDrawable(getResources(), bitmap); if (Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.JELLY_BEAN) { yourBackgroundView.setBackgroundDrawable(d); } else { yourBackgroundView.setBackground(d); Log.d("Drag_and_Drop_App", "Background is set"); } } @SuppressLint("NewApi") private void setBackgroundImageForIcon(Bitmap bitmap) { Log.d("Drag_and_Drop_App", "Icon..."); ImageView ivICON = (ImageView) findViewById(R.id.bwidgetOpen); BitmapDrawable dq = new BitmapDrawable(getResources(), bitmap); if (Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.JELLY_BEAN) { // ivICON.setImageDrawable(dq); ivICON.setImageResource(R.drawable.pattern1); } else { // ivICON.setImageDrawable(dq); ivICON.setImageResource(R.drawable.pattern1); Log.d("Drag_and_Drop_App", "Icon is set"); } } } </code></pre>
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