1 package com.app.motiongear.clipboundsmotion;
 2
 3 import android.graphics.Rect;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.util.Log;
 7 import android.view.View;
 8 import android.widget.Button;
 9 import android.widget.ImageView;
10
11 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
12
13     Button mRectBtn, mBoundBtn;
14     ImageView mImageView;
15     Rect originRect = new Rect();
16
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.activity_main);
21
22         mRectBtn = (Button) this.findViewById(R.id.btn1);
23         mBoundBtn = (Button) this.findViewById(R.id.btn2);
24         mImageView = (ImageView) this.findViewById(R.id.imageview);
25         mRectBtn.setOnClickListener(this);
26         mBoundBtn.setOnClickListener(this);
27         mImageView.setOutlineProvider(new CustomOutlineProvider());
28     }
29
30
31     @Override
32     public void onClick(View v) {
33         if (v == mRectBtn) {
34             //getGlobalVisibleRect()相对与父布局的rect
35             mImageView.getGlobalVisibleRect(originRect);
36             int centerX = (originRect.right - originRect.left) / 2;
37             int centerY = (originRect.bottom - originRect.top) / 2;
38             //设置View的显示区域，坐标是自身
39             Rect tmp = new Rect(centerX - 150, centerY - 150, centerX + 150, centerY + 150);
40             mImageView.setClipBounds(tmp);
41         }
42         if (v == mBoundBtn) {
43             //通过Outline设置
44             if(!mImageView.getClipToOutline()){
45                 mImageView.setClipToOutline(true);
46             }else{
47                 mImageView.setClipToOutline(false);
48             }
49
50         }
51     }
52 }

 1 package com.app.motiongear.clipboundsmotion;
 2
 3 import android.graphics.Outline;
 4 import android.graphics.Rect;
 5 import android.view.View;
 6 import android.view.ViewOutlineProvider;
 7
 8 /**
 9  * Created by ubuntu on 15-11-13.
10  */
11 public class CustomOutlineProvider extends ViewOutlineProvider {
12
13     @Override
14     public void getOutline(View view, Outline outline) {
15         Rect rect = new Rect();
16         view.getGlobalVisibleRect(rect);
17         int leftMargin =100;
18         int topMargin = 100;
19         Rect selfRect = new Rect(leftMargin, topMargin,
20                 rect.right - rect.left - leftMargin, rect.bottom - rect.top - topMargin);
21         outline.setRoundRect(selfRect, 30);
22     }
23 }