Android-模拟电视屏幕开关机特效

效果图：

布局代码：

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    tools:context=".MainActivity">
<LinearLayout
    android:id="@+id/LL"
    android:layout_width="wrap_content"
    android:orientation="horizontal"
    android:layout_centerHorizontal="true"
    android:layout_height="wrap_content">
    <Button
        android:background="#ffffff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="off"
        android:text="关" />

    <Button
        android:background="#ffffff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="on"
        android:text="开" />
</LinearLayout>
    <LinearLayout
        android:layout_below="@+id/LL"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <ImageView

        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView"
        android:scaleType="centerCrop"
        android:src="@drawable/aa"/>
    </LinearLayout>
</RelativeLayout>

package com.example.yu_longji.android21;

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

/**
 * Created by yu_longji on 2015/8/30.
 */
public class MyAnimation {

    OffAnimation offanim;
    OnAnimation onanim;

    MyAnimation() {
        offanim = new OffAnimation();
        onanim = new OnAnimation();
    }


    public class OffAnimation extends Animation {
        int halfWidth;
        int halfHeight;

        @Override
        public void initialize(int width, int height, int parentWidth, int parentHeight) {
            super.initialize(width, height, parentWidth, parentHeight);
            //设置动画时间为800毫秒
            setDuration(800);
            //设置动画结束后就结束在动画结束的时刻
            setFillAfter(true);
            //保存View的中心点
            halfWidth = width / 2;
            halfHeight = height / 2;

            //设置动画先加速后减速

            setInterpolator(new AccelerateDecelerateInterpolator());
        }

        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            super.applyTransformation(interpolatedTime, t);
            final Matrix matrix = t.getMatrix();
            //interpolatedTime是从0~1的一个变化，所以我们前80%让动画缩小成一个线，后20%保持线的高度缩小线的宽度
            if (interpolatedTime < 0.8) {
                matrix.preScale(1 + 0.625f * interpolatedTime, 1 - interpolatedTime / 0.8f + 0.01f, halfWidth, halfHeight);
            } else {
                matrix.setScale(7.5f * (1 - interpolatedTime), 0.01f, halfWidth, halfHeight);
            }
        }
    }


    public class OnAnimation extends Animation {
        int halfWidth;
        int halfHeight;

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

            //设置动画时间为900毫秒
            setDuration(900);
            //设置动画结束后就结束在动画结束的时刻
            setFillAfter(true);
            //保存View的中心点
            halfWidth = width / 2;
            halfHeight = height / 2;

            setInterpolator(new AccelerateInterpolator());
        }

        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            super.applyTransformation(interpolatedTime, t);
            final Matrix matrix = t.getMatrix();
            if (interpolatedTime < 0.2) {
                matrix.setScale(0.01f, interpolatedTime * 5.0f, halfWidth, halfHeight);
            } else {
                matrix.setScale((float) Math.pow(interpolatedTime, 4), 1, halfWidth, halfHeight * 2);
            }
        }
    }

    //上下收缩
//        matrix.preScale(1,1-interpolatedTime,halfWidth*2,halfHeight);
    //中间一条线拉伸
//        matrix.setScale(interpolatedTime,0.01f,halfWidth,halfHeight);
    //上下伸展开
//        matrix.preScale(1,-(interpolatedTime),halfWidth*2,halfHeight);
    //左右向中间收缩
//        matrix.preScale(1-interpolatedTime,1,halfWidth,halfHeight*2);
    //上下伸展开
//        matrix.setScale(1, interpolatedTime, width, halfHeight);
}

package com.example.yu_longji.android21;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends Activity {

    ImageView imageView;
    MyAnimation myAnimation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.imageView);
        myAnimation = new MyAnimation();
    }
    //关
    public void off(View view) {
        imageView.startAnimation(myAnimation.offanim);
    }
    //开
    public void on(View view) {
        imageView.startAnimation(myAnimation.onanim);
    }

}

最后

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