使用AlarmManager定时更换壁纸

原文地址：http://blog.csdn.net/u010142437/article/details/9286723

更换壁纸要用到WallpaperManager，它提供了clear()方法清除壁纸，还提供了如下方法设置系统的壁纸：

setBitmap(Bitmap bitmap):将壁纸设置为bitmap所代表的位图。

setResource(int resid)：将壁纸设置为resid资源所代表的图片。

setStream(InputStream data)：将壁纸设置为data数据所代表的图片。

本示例通过AlarmManager来周期性地调用某个Service，从而让系统实现定时更换壁纸的功能。代码如下：

Activity：

package com.guyun.activity;

import com.guyun.alarmchangewallpaper.R;
import com.guyun.service.ChangeWallpaperService;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

publicclass ChangeWallpaperActivity extends Activity {
    //定义AlarmManager对象
    private AlarmManager aManager;
private Button start,stop;
    @Override
    protectedvoid onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 start=(Button) findViewById(R.id.main_btn_start);
        stop=(Button) findViewById(R.id.main_btn_stop);
        //获取AlarmManager服务对象
        aManager=(AlarmManager) getSystemService(Service.ALARM_SERVICE);
        //指定要启动的Service组件
        Intent intent=new Intent(ChangeWallpaperActivity.this,ChangeWallpaperService.class);
        //创建PendingIntent对象
        final PendingIntent pi=PendingIntent.getService(ChangeWallpaperActivity.this,0, intent, 0);
        start.setOnClickListener(new OnClickListener() {

            @Override
            publicvoid onClick(View v) {
                Log.i("onClick", "进入onClick");
                //设置每隔3秒执行pi代表的组件一次
                aManager.setRepeating(AlarmManager.RTC_WAKEUP, 0, 3000, pi);
                start.setEnabled(false);
                stop.setEnabled(true);
                Toast.makeText(ChangeWallpaperActivity.this, "壁纸定时更换启动成功啦", Toast.LENGTH_SHORT).show();
            }
        });
        stop.setOnClickListener(new OnClickListener() {

            @Override
            publicvoid onClick(View v) {
                start.setEnabled(true);
                stop.setEnabled(false);
                //取消对pi的调度
                aManager.cancel(pi);
            }
        });
    }

}

package com.guyun.activity;

import com.guyun.alarmchangewallpaper.R;
import com.guyun.service.ChangeWallpaperService;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class ChangeWallpaperActivity extends Activity {
	//定义AlarmManager对象
	private AlarmManager aManager;
private Button start,stop;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        start=(Button) findViewById(R.id.main_btn_start);
        stop=(Button) findViewById(R.id.main_btn_stop);
        //获取AlarmManager服务对象
        aManager=(AlarmManager) getSystemService(Service.ALARM_SERVICE);
        //指定要启动的Service组件
        Intent intent=new Intent(ChangeWallpaperActivity.this,ChangeWallpaperService.class);
        //创建PendingIntent对象
        final PendingIntent pi=PendingIntent.getService(ChangeWallpaperActivity.this,0, intent, 0);
        start.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Log.i("onClick", "进入onClick");
				//设置每隔3秒执行pi代表的组件一次
				aManager.setRepeating(AlarmManager.RTC_WAKEUP, 0, 3000, pi);
				start.setEnabled(false);
				stop.setEnabled(true);
				Toast.makeText(ChangeWallpaperActivity.this, "壁纸定时更换启动成功啦", Toast.LENGTH_SHORT).show();
			}
		});
        stop.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				start.setEnabled(true);
				stop.setEnabled(false);
				//取消对pi的调度
				aManager.cancel(pi);
			}
		});		
    }
    
}

Service：

package com.guyun.service;

import java.io.IOException;

import com.guyun.alarmchangewallpaper.R;

import android.app.Service;
import android.app.WallpaperManager;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

publicclass ChangeWallpaperService extends Service {
    // 定义定时更换壁纸的资源
    int[] wallpapers = newint[] { R.drawable.whatsnew_fornew_01,
            R.drawable.whatsnew_fornew_02, R.drawable.whatsnew_fornew_03,
            R.drawable.whatsnew_fornew_04, R.drawable.whatsnew_fornew_05 };
    // 定义系统的壁纸管理服务
    WallpaperManager wManager;
    // 定义当前所显示的壁纸
    int current = 0;

    @Override
    publicint onStartCommand(Intent intent, int flags, int startId) {
        Log.i("onStartCommand", "进入onStartCommand");
        // 如果到了最后一张重新开始
        if (current >= wallpapers.length) {
            current = 0;
        }
        try {
            // 改变壁纸
            wManager.setResource(wallpapers[current++]);
        } catch (IOException e) {
            e.printStackTrace();
        }
        returnsuper.onStartCommand(intent, flags, startId);
    }

    @Override
    publicvoid onCreate() {
        super.onCreate();
        Log.i("onCreate", "进入onCreate");
        // 初始化WallpaperManager对象
        wManager = WallpaperManager.getInstance(this);
    }

    @Override
    public IBinder onBind(Intent intent) {
        returnnull;
    }
}

package com.guyun.service;

import java.io.IOException;

import com.guyun.alarmchangewallpaper.R;

import android.app.Service;
import android.app.WallpaperManager;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

public class ChangeWallpaperService extends Service {
	// 定义定时更换壁纸的资源
	int[] wallpapers = new int[] { R.drawable.whatsnew_fornew_01,
			R.drawable.whatsnew_fornew_02, R.drawable.whatsnew_fornew_03,
			R.drawable.whatsnew_fornew_04, R.drawable.whatsnew_fornew_05 };
	// 定义系统的壁纸管理服务
	WallpaperManager wManager;
	// 定义当前所显示的壁纸
	int current = 0;

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		Log.i("onStartCommand", "进入onStartCommand");
		// 如果到了最后一张重新开始
		if (current >= wallpapers.length) {
			current = 0;
		}
		try {
			// 改变壁纸
			wManager.setResource(wallpapers[current++]);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return super.onStartCommand(intent, flags, startId);
	}

	@Override
	public void onCreate() {
		super.onCreate();
		Log.i("onCreate", "进入onCreate");
		// 初始化WallpaperManager对象
		wManager = WallpaperManager.getInstance(this);
	}

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}
}

加上如下权限：

<uses-permissionandroid:name="android.permission.SET_WALLPAPER"/>