渲染脚本分配崩溃

Question

Can not understand because when I try to use the Allocation both as input and ouput, the program crashes.

I've checked if due to some type of permission in the android manifest, but neither.

The project.properties is as follows:

target=android-19
android.library.reference.1=../appcompat_v7
renderscript.target=19
renderscript.support.mode=true
sdk.buildtools=20.0.0

The code is as follows:

...
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main);

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;
    options.inJustDecodeBounds = true;
    Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

    Allocation inputAlloc = Allocation.createFromBitmap(r, bmp, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);

...

And the logcat shows me the following errors:

09-25 11:32:08.623: E/AndroidRuntime(537): FATAL EXCEPTION: main
09-25 11:32:08.623: E/AndroidRuntime(537): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.gpurenderscript/com.example.gpurenderscript.MainActivity}: java.lang.NullPointerException
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.os.Looper.loop(Looper.java:123)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.ActivityThread.main(ActivityThread.java:3683)
09-25 11:32:08.623: E/AndroidRuntime(537):  at java.lang.reflect.Method.invokeNative(Native Method)
09-25 11:32:08.623: E/AndroidRuntime(537):  at java.lang.reflect.Method.invoke(Method.java:507)
09-25 11:32:08.623: E/AndroidRuntime(537):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
09-25 11:32:08.623: E/AndroidRuntime(537):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
09-25 11:32:08.623: E/AndroidRuntime(537):  at dalvik.system.NativeStart.main(Native Method)
09-25 11:32:08.623: E/AndroidRuntime(537): Caused by: java.lang.NullPointerException
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.support.v8.renderscript.Allocation.createFromBitmap(Allocation.java:1337)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.support.v8.renderscript.Allocation.createFromBitmap(Allocation.java:1388)
09-25 11:32:08.623: E/AndroidRuntime(537):  at com.example.gpurenderscript.MainActivity.onCreate(MainActivity.java:33)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-25 11:32:08.623: E/AndroidRuntime(537):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
09-25 11:32:08.623: E/AndroidRuntime(537):  ... 11 more

Thanks a lot!!

Answer 1

Remove the line:

options.inJustDecodeBounds = true

This is setting up the BitmapFactory with the sizing information for your bitmap, but the decodeResource() method is actually return null as there was no memory allocated for the backing pixels, so no Bitmap object. You need to have the backing pixels in order for the Allocation to actually be created so it can marshall the data between Java and RenderScript.