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POOverlay image on top of another image
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  1. POOverlay image on top of another image
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    copied!<p>I am doing a photo editing function that kinda works like a water mark.</p> <p>The user selects the image A. After the image is selected, the user can select another image B to populate on top of the image A and they can move the image B around while image A is still static at the back.</p> <p>After the placement of image B is done, the user can merge both image into one and save it as a <strong>single image</strong>. </p> <p>I got the movement of image B function done but i am not sure how to actually combine the two images together.</p> <p><strong>Edit 1:</strong> I want them to be either taken from the camera or gallery then combine the two images, B over A and save it to SD Card </p> <p><strong>Edit 2:</strong> This is what i did to make the image B to move around my view. Now all i need is to connect the image b to the main image (which is in the background) and save it as a SD card. Is there a way to actually integrate both imageviews and its custom position (image B) and create a bitmap that can be saved to the sd card.</p> <pre><code>private ImageView img_additionalImage; float x, y = 0.0f; boolean isImageMoving = false; img_additionalImage = (ImageView) findViewById(R.id.img_additionalImage); img_additionalImage.setOnTouchListener(new OnTouchListener() { @SuppressLint("NewApi") @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: isImageMoving = true; break; case MotionEvent.ACTION_MOVE: if (isImageMoving) { x = event.getRawX() - img_additionalImage.getWidth() / 2; y = event.getRawY() - img_additionalImage.getHeight() / 2; img_additionalImage.setX(x); img_additionalImage.setY(y); } break; case MotionEvent.ACTION_UP: isImageMoving = false; break; } return true; } }); </code></pre> <p><strong>Edit 3:</strong> This is the code that gives me nullpointer when i call this.</p> <p>MainActivity</p> <pre><code>CombineImages combineImages = new CombineImages(MainActivity.this); img_additionalImage = (ImageView) findViewById(R.id.img_additionalImage); combineImages.combine(img_additionalImage); </code></pre> <p>The CombineImages class is what you have provided.</p> <pre><code>12-31 20:54:33.470: E/AndroidRuntime(6330): FATAL EXCEPTION: main 12-31 20:54:33.470: E/AndroidRuntime(6330): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.photosharingtest2/com.example.photosharingtest2.MainActivity}: java.lang.NullPointerException 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2024) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.ActivityThread.access$600(ActivityThread.java:140) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.os.Handler.dispatchMessage(Handler.java:99) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.os.Looper.loop(Looper.java:137) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.ActivityThread.main(ActivityThread.java:4898) 12-31 20:54:33.470: E/AndroidRuntime(6330): at java.lang.reflect.Method.invokeNative(Native Method) 12-31 20:54:33.470: E/AndroidRuntime(6330): at java.lang.reflect.Method.invoke(Method.java:511) 12-31 20:54:33.470: E/AndroidRuntime(6330): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 12-31 20:54:33.470: E/AndroidRuntime(6330): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 12-31 20:54:33.470: E/AndroidRuntime(6330): at dalvik.system.NativeStart.main(Native Method) 12-31 20:54:33.470: E/AndroidRuntime(6330): Caused by: java.lang.NullPointerException 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.content.ContextWrapper.getResources(ContextWrapper.java:81) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.view.View.&lt;init&gt;(View.java:3314) 12-31 20:54:33.470: E/AndroidRuntime(6330): at com.example.photosharingtest2.CombineImages.&lt;init&gt;(CombineImages.java:27) 12-31 20:54:33.470: E/AndroidRuntime(6330): at com.example.photosharingtest2.MainActivity.&lt;init&gt;(MainActivity.java:39) 12-31 20:54:33.470: E/AndroidRuntime(6330): at java.lang.Class.newInstanceImpl(Native Method) 12-31 20:54:33.470: E/AndroidRuntime(6330): at java.lang.Class.newInstance(Class.java:1319) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.Instrumentation.newActivity(Instrumentation.java:1057) 12-31 20:54:33.470: E/AndroidRuntime(6330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015) 12-31 20:54:33.470: E/AndroidRuntime(6330): ... 11 more </code></pre>
 

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