把android 中图片局部区域改为透明(android的图片应该放到哪一个目录下面?)

编辑：rootadmin

import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.ImageView;public class MainActivity extends Activity {private ImageView iv_after;private ImageView iv_before;private Bitmap beforeBitmap;private Canvas canvas;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);this.iv_after = (ImageView) this.findViewById(R.id.after);this.iv_before = (ImageView) this.findViewById(R.id.before);// decodeResource()创建出来的图片属性为只读Bitmap after = BitmapFactory.decodeResource(getResources(),R.drawable.after);Bitmap before = BitmapFactory.decodeResource(getResources(),R.drawable.before);// 创建一张可编辑的空白图片this.beforeBitmap = Bitmap.createBitmap(before.getWidth(),before.getHeight(), before.getConfig());this.canvas = new Canvas(beforeBitmap);this.canvas.drawBitmap(before, new Matrix(), new Paint());this.iv_after.setImageBitmap(after);this.iv_before.setImageBitmap(beforeBitmap);this.iv_before.setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_MOVE:int x = (int) event.getX();int y = (int) event.getY();for (int i = -; i <= ; i&#;&#;) {for (int j = -; j <= ; j&#;&#;) {if (x &#; i >= 0 && y &#; j >= 0&& x &#; i < beforeBitmap.getWidth()&& y &#; j < beforeBitmap.getHeight()) {beforeBitmap.setPixel(x &#; i, y &#; j,Color.TRANSPARENT);}}}iv_before.setImageBitmap(beforeBitmap);break;}return true;}});}

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