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PONull Pointer Exception in combining two Bitmap Images
 

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    <p>I am using a method to <code>combine two Bitmap Images</code> and write in the <code>SDCard</code>. The App. works fine in the emulator, but when I tried to execute in on the Real Device it throughs <code>Null Pointer Exception</code> at this line <code>cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);</code> that is to create a <code>new Bitmap</code> on which I will draw both the images that are to be combined using <code>Canvas</code>. </p> <p>Now, here in <code>combineImages(Bitmap background, Bitmap foreground)</code> the first argument is the <code>Bitmap from Camera</code> Picture and the <code>second is the forefround Gallery item</code>. The Bitmap taken from Camera is a <code>static Bitmap</code>, I guess that is the only thing that is running me into trouble. So, could someone give me a nice solution to save a picture taken from <code>Camera</code> as a <code>temporary</code> storage so that I doesn't make any issue which using it further.</p> <pre><code>public void combineImages(Bitmap background, Bitmap foreground) { Bitmap cs = null; int width = 0, height = 0; width = background.getWidth(); height = background.getHeight(); cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas comboImage = new Canvas(cs); comboImage.drawBitmap(background, 0, 0, null); comboImage.drawBitmap(foreground, 100, 300, null); String tmpImg = String.valueOf(System.currentTimeMillis()) + ".png"; OutputStream os = null; try { os = new FileOutputStream(Environment.getExternalStorageDirectory() + File.separator + tmpImg); cs.compress(CompressFormat.PNG, 100, os); } catch (IOException e) { e.printStackTrace(); } } </code></pre> <p>Here is my Logcat Output when I tried on Real Device.(LG Optimus Black P-970)</p> <pre><code>10-04 12:36:08.329: ERROR/AndroidRuntime(16356): FATAL EXCEPTION: main 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): java.lang.NullPointerException 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.graphics.Bitmap.createBitmap(Bitmap.java:469) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at com.cam.GalleryImageSelected.combineImages(GalleryImageSelected.java:66) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at com.cam.GalleryImageSelected$1.onClick(GalleryImageSelected.java:90) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:874) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.widget.AdapterView.performItemClick(AdapterView.java:294) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.widget.ListView.performItemClick(ListView.java:3387) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2408) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.os.Handler.handleCallback(Handler.java:587) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.os.Handler.dispatchMessage(Handler.java:92) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.os.Looper.loop(Looper.java:123) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at android.app.ActivityThread.main(ActivityThread.java:4627) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at java.lang.reflect.Method.invokeNative(Native Method) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at java.lang.reflect.Method.invoke(Method.java:521) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:876) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634) 10-04 12:36:08.329: ERROR/AndroidRuntime(16356): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. COWell can I know the reason for a down-vote?
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    2. COAre you sure the width and height in the line cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); are greater than 0. Just can't seem to think of another error in that line.
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    3. COYes, because the height and width comes from the picture taken by camera so obviously they are greater than 0. Thanks.
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