Re: [android-developers] Merge two bitmaps

Look at line 263 in AndroidCamera.java.  

Something is null there that shouldn't be.

We don't know which line of yours is 263.

On Tuesday, July 31, 2012 5:52:27 PM UTC-5, Numair Qadir wrote:

With the help of "pro Android.Media", i tried, but it gave me force close error, here is my code and logcat

// Camera arg conversion to Bitmap

Bitmap cameraBitmap = BitmapFactory.decodeByteArray(arg0, 0,

arg0.length);

Bitmap back = Bitmap.createBitmap(cameraBitmap.getWidth(),

cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888);

Canvas cam = new Canvas(back);

cam.drawBitmap(cameraBitmap, matrix, null);

// FrameLayout to Bitmap

FrameLayout mainLayout = (FrameLayout) findViewById(R.id.frame);

Bitmap foreground = Bitmap.createBitmap(mainLayout.getWidth(),

mainLayout.getHeight(), Bitmap.Config.ARGB_8888);

Canvas c = new Canvas(foreground);

mainLayout.draw(c);

Bitmap cs = Bitmap.createBitmap(cameraBitmap.getWidth(), cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(cs);

Paint paint = new Paint();

canvas.drawBitmap(cameraBitmap, 0, 0, paint);

paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.MULTIPLY));

canvas.drawBitmap(foreground, 0, 0, paint);

view.setImageBitmap(cs);

and log cat

08-01 04:46:07.969: E/AndroidRuntime(737): FATAL EXCEPTION: main

08-01 04:46:07.969: E/AndroidRuntime(737): java.lang.NullPointerException

08-01 04:46:07.969: E/AndroidRuntime(737): at com.exercise.AndroidCamera.AndroidCamera$4.onPictureTaken(AndroidCamera.java:263)

08-01 04:46:07.969: E/AndroidRuntime(737): at android.hardware.Camera$EventHandler.handleMessage(Camera.java:320)

08-01 04:46:07.969: E/AndroidRuntime(737): at android.os.Handler.dispatchMessage(Handler.java:99)

08-01 04:46:07.969: E/AndroidRuntime(737): at android.os.Looper.loop(Looper.java:123)

08-01 04:46:07.969: E/AndroidRuntime(737): at android.app.ActivityThread.main(ActivityThread.java:4627)

08-01 04:46:07.969: E/AndroidRuntime(737): at java.lang.reflect.Method.invokeNative(Native Method)

08-01 04:46:07.969: E/AndroidRuntime(737): at java.lang.reflect.Method.invoke(Method.java:521)

08-01 04:46:07.969: E/AndroidRuntime(737): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)

08-01 04:46:07.969: E/AndroidRuntime(737): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

08-01 04:46:07.969: E/AndroidRuntime(737): at dalvik.system.NativeStart.main(Native Method)

Can you please help me to figure out the issue? Thanks

On Tue, Jul 31, 2012 at 8:44 PM, Jim Graham <spooky130u@gmail.com> wrote:

On Tue, Jul 31, 2012 at 05:57:47AM -0700, Numair Qadir wrote:
> I want to merge two bitmaps, here is my code

I was just going to point you to the right page in the dev guide, but I
don't remember if there even is one (I learned this from a book, "Pro
Android Media").  Be advised that with larger bitmaps, you can easily
cause an Out Of Memory error and, if that isn't caught, a force close,
so if you need to do this with LARGE bitmaps, you'll have to use the NDK.

   // blend src1 and src2 into dest (must be same size and, I think they
   // have to be the same configuration, too, e.g., both ARGB_8888)

   Bitmap dest = Bitmap.createBitmap(width, height, src1.getConfig());
   Canvas canvas = new Canvas(src2);
   Paint paint = new Paint();

   canvas = new Canvas(src2);
   paint = new Paint();
   canvas.drawBitmap(src1, 0, 0, paint);
   paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_OVER));
   canvas.drawBitmap(dest, 0, 0, paint);

PorterDuff has quite a few different modes, so check out the dev guide's
page on PorterDuff.Mode for more information.

Later,
   --jim

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