Android 旧电视退出效果

费话不多说，直接上代码


TVOffAnimation.java

package com.iaiai.activity;

import android.graphics.Matrix;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.Transformation;

/**
 * 
 * <p>
 * Title: TVOffAnimation.java
 * </p>
 * <p>

 * </p>
 * <p>

 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2012-10-8 下午1:33:44
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class TVOffAnimation extends Animation {

  private int halfWidth;
  private int halfHeight;

  @Override
  public void initialize(int width, int height, int parentWidth, int parentHeight) {

    super.initialize(width, height, parentWidth, parentHeight);
    setDuration(500);
    setFillAfter(true);
    // 保存View的中心点
    halfWidth = width / 2;
    halfHeight = height / 2;
    setInterpolator(new AccelerateDecelerateInterpolator());

  }

  @Override
  protected void applyTransformation(float interpolatedTime, Transformation t) {

    final Matrix matrix = t.getMatrix();
    if (interpolatedTime < 0.5) {
      matrix.preScale(1 + 0.625f * interpolatedTime, 1 - interpolatedTime / 0.8f + 0.003f, halfWidth, halfHeight);
    } else {
      matrix.preScale(7.5f * (1 - interpolatedTime), 0.003f, halfWidth, halfHeight);
    }
  }
}

MainActivity.java

package com.iaiai.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

/**
 * 
 * <p>
 * Title: MainActivity.java
 * </p>
 * <p>

 * </p>
 * <p>

 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2012-10-8 下午1:33:44
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class MainActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    findViewById(R.id.btn).setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        findViewById(R.id.root).startAnimation(new TVOffAnimation());
      }
    });
  }
}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/white"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <Button
        android:id="@+id/btn"
        android:layout_width="fill_parent
        android:layout_height="wrap_content"
        android:text="动画" />

</LinearLayout>