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>