Android 心跳动画

直接上代码  MainActivity

 public class MainActivity extends AppCompatActivity {

     private ImageView ivHart;  //图片信息
     AlphaAnimation alphaAnimation = null;    //心跳动画

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

         ivHart = (ImageView) findViewById(R.id.ivHart);

         shadeAnim(ivHart);
     }

     @Override
     protected void onResume() {
         super.onResume();
         if (alphaAnimation != null) {
             alphaAnimation.start();
         }
     }

     @Override
     protected void onPause() {
         super.onPause();
         if (alphaAnimation != null) {
             alphaAnimation.cancel();
         }
     }

     /**
      * 心跳渐变动画
      *
      * @param view 执行该动画的view对象
      */
     private void shadeAnim(View view) {
         alphaAnimation = new AlphaAnimation(0.1f, 1.0f);
         alphaAnimation.setDuration(2000);
         alphaAnimation.setRepeatCount(-1);
         alphaAnimation.setRepeatMode(Animation.REVERSE);
         alphaAnimation.start();
         view.setAnimation(alphaAnimation);
     }

布局文件

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/activity_main"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
      android:background="@drawable/yy"
     tools:context="com.hanbao.myapplication.MainActivity">

     <ImageView
         android:id="@+id/ivHart"
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:scaleType="centerCrop"
         android:src="@drawable/x"/>

 </RelativeLayout>