Android实现图片按任意路径截取
Android实现图片按任意路径截取
使用 Android提供的Path实現图片的截取,重写View的onTouchEvent方法和onDraw方法,onTouchEvent负责实现截取路径的构件,onDraw进行刷新页面,重写View类的代码如下 :
- public class MyView extends View {
- private Drawable mDrawable;
- private Path mPath;
- private float mX = -1;
- private float mY = -1;
- private float mPastX;
- private float mPastY;
- public MyView(Context context) {
- super(context);
- // TODO Auto-generated constructor stub
- mPath = new Path();
- }
- public void setDrawable(Drawable pDrawable){
- mDrawable = pDrawable;
- }
- @Override
- protected void onDraw(Canvas canvas) {
- // TODO Auto-generated method stub
- super.onDraw(canvas);
- Log.i("xiao", "onDraw");
- mDrawable.setBounds(0, 0, getWidth(), getHeight());
- Rect lRect = mDrawable.getBounds();
- Log.i("xiao", "lRect.left = " + lRect.left + " top = " + lRect.top + " right = " + lRect.right + " bottom = " + lRect.bottom);
- if(!mPath.isEmpty()){
- Log.i("xiao", "!mPath.isEmpty()");
- canvas.clipPath(mPath);
- //mDrawable.draw(canvas);
- }
- mDrawable.draw(canvas);
- }
- @Override
- public boolean onTouchEvent(MotionEvent event) {
- // TODO Auto-generated method stub
- Log.i("xiao", "onTouchEvent");
- int lAction = event.getAction();
- if(mX != -1){
- mPastX = mX;
- mPastY = mY;
- }
- mX = event.getX();
- mY = event.getY();
- switch(lAction){
- case MotionEvent.ACTION_DOWN:
- mPath.reset();
- mPath.moveTo(mX, mY);
- break;
- case MotionEvent.ACTION_MOVE:
- mPath.quadTo(mPastX, mPastY, (mX + mPastX) / 2, (mY + mPastY) / 2);
- break;
- case MotionEvent.ACTION_UP:
- mPath.lineTo(mX, mY);
- mX = -1;
- mY = -1;
- invalidate();
- break;
- default:
- break;
- }
- return true;
- }
- }
Activity主要负责获取和设置Drawable和设置布局,代码如下:
- private MyView mView;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- mView = new MyView(this);
- mView.setDrawable(this.getResources().getDrawable(R.drawable.test1));
- this.setContentView(mView);
- }
未截取时效果:
画一个路径截取效果图:
Android实现图片按任意路径截取源码下载地址:
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具体下载目录在 /2012年资料/9月/13日/Android实现图片按任意路径截取
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