Android笔记------自定义互动屏保

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.xxx.dream">

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>

    <application android:supportsRtl="true">

        <service
            android:name=".DayDreamService"
            android:exported="true"
            android:label="屏保名字"
            android:permission="android.permission.BIND_DREAM_SERVICE">
            <intent-filter>
                <action android:name="android.service.dreams.DreamService"/>

                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </service>
    </application>

</manifest>

其实主要逻辑就是轮询播放，以达到banner的效果

package com.xxx.dream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Build;
import android.os.Handler;
import android.service.dreams.DreamService;
import android.support.annotation.RequiresApi;
import android.widget.ImageView;

import java.io.InputStream;
import java.util.ArrayList;

@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
public class DayDreamService extends DreamService {


    private int currentItem = 0;
    private ImageView mImageView;
    private InputStream mInputStream000;
    private InputStream mInputStream001;
    private int time = 5 * 1000;// 切图时间
    private Handler handler = new Handler();

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        setInteractive(false);
        setFullscreen(true);
        setContentView(R.layout.dream);
        init();
    }


    /***
     *  初始化
     */
    private void init() {
        mImageView = (ImageView) findViewById(R.id.iv);

        //将图片放在raw目录下
        mInputStream000 = getResources().openRawResource(R.raw.images000);
        mInputStream001 = getResources().openRawResource(R.raw.images001);

        setimage();
        handler.postDelayed(task, time);
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();

        System.exit(0);
        android.os.Process.killProcess(android.os.Process.myPid());
    }



    @Override
    public void onDreamingStarted() {
        super.onDreamingStarted();
    }


    /***
     *
     * 设置图片
     *
     */
    private void setimage() {
        // 把历史的ImageView 图片对象（imageView)释放
        BitmapDrawable bitmapDrawable = (BitmapDrawable) mImageView.getBackground();
        if (bitmapDrawable != null) {
            Bitmap hisBitmap = bitmapDrawable.getBitmap();
            if (hisBitmap.isRecycled() == false) {
                hisBitmap.recycle();
            }
        }

        BitmapFactory.Options mOptions = new BitmapFactory.Options();
        mOptions.inPreferredConfig = Bitmap.Config.RGB_565;
        mOptions.inPurgeable = true;
        mOptions.inInputShareable = true;


        Bitmap bmp = null;
        Bitmap oldbmp = null;
        ArrayList<InputStream> inputStreams = new ArrayList<>();
        inputStreams.add(mInputStream000);
        inputStreams.add(mInputStream001);


        InputStream in = inputStreams.get(currentItem % inputStreams.size());

        bmp = BitmapFactory.decodeStream(in,null, mOptions);
        // bmp=decodeSampledBitmapFromResource(in, 960,540);

        if (oldbmp == null) {
            oldbmp = bmp;
        }

        Drawable[] layers = new Drawable[2];
        layers[0] = new BitmapDrawable(oldbmp);
        layers[1] = new BitmapDrawable(bmp);
        oldbmp = bmp;

        if (currentItem == 0) {
            mImageView.setImageBitmap(bmp);
        } else {
            TransitionDrawable transitionDrawable = new TransitionDrawable(layers);
            mImageView.setImageDrawable(transitionDrawable);
            transitionDrawable.startTransition(400);
        }
        System.gc();
    }


    /****
     * 轮询
     */
    private Runnable task = new Runnable() {
        public void run() {
            // TODOAuto-generated method stub
            handler.postDelayed(this, time);// 设置延迟时间
            // 需要执行的代码
            currentItem++;

            setimage();
        }
    };

}

修改默认互动屏保，请将以下目录文件中config_dreamsDefaultComponent修改为需要的屏保：
frameworks/base/core/res/res/values/config.xml

<string name="config_dreamsDefaultComponent" translatable="false">com.google.android.deskclock/com.android.deskclock.Screensaver</string>

\frameworks\base\core\res\res\values\config.xml中，如下两个改为true即可

//表示默认是否插入基座时启动
<bool name="config_dreamsActivatedOnDockByDefault">true</bool>

//表示默认是否充电时启动
<bool name="config_dreamsActivatedOnSleepByDefault">true</bool>

如何默认关闭 设置-显示中的互动屏保？

修改frameworks/base/core/res/res/values/config.xml下的

<bool name="config_dreamsEnabledByDefault">false</bool>将值改为false

本文借鉴了 http://blog.csdn.net/a2700419/article/details/75212929