Android-Service自动更换手机壁纸

先看下效果：

使用界面：

划重点，使用service前别忘了给相应的service添加服务

代码语言：javascript复制

<service android:name=".ChangeService"></service>

具体实现： 首先定义ChangeService类，继承Service访问系统实现壁纸切换

代码语言：javascript复制

public class ChangeService extends Service {
    int[] wallpapers = new int[]{
            R.drawable.a2, R.drawable.a3, R.drawable.a4
    };
    WallpaperManager wallpaperManager;
    int current = 0;
    @Override
    public void onCreate() {
        super.onCreate();
        wallpaperManager = WallpaperManager.getInstance(this);
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (current >= 3) {
            current = 0;
        } try {
            wallpaperManager.setResource(wallpapers[current  ]);
        } catch (IOException e) {
            e.printStackTrace();
        } return START_STICKY;
    }
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

这里我们用闹钟访问pendingIntent来实现壁纸更换：

代码语言：javascript复制

public class MainActivity extends Activity {
    private Button mStart;
    private Button mStop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mStart = (Button) findViewById(R.id.start);
        mStop = (Button) findViewById(R.id.stop);

        final Intent intent = new Intent(MainActivity.this, ChangeService.class);
         final PendingIntent pi = PendingIntent.getService(MainActivity.this, 0, intent, 0);
         mStart.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 AlarmManager alarmManager = (AlarmManager) getSystemService(Service.ALARM_SERVICE);
                 alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, 0, 2000, pi);
                  mStart.setEnabled(false); mStop.setEnabled(true);
                  Toast.makeText(MainActivity.this, "壁纸定时更换启动成功啦", Toast.LENGTH_SHORT).show();
             }
         });
         mStop.setOnClickListener(new View.OnClickListener() {
             @Override public void onClick(View v) {
                 mStart.setEnabled(true);
             mStop.setEnabled(false);

              AlarmManager alarmManager = (AlarmManager) getSystemService(Service.ALARM_SERVICE);
               alarmManager.cancel(pi);
             }
         });
    }
}

布局设计：

代码语言：javascript复制

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal">

        <Button
            android:id="@ id/start"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:text="Start"
            android:textSize="25dp"
            android:textColor="#ffffffff"/>

        <Button
            android:id="@ id/stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:text="Stop"
            android:textSize="25dp"
            android:textColor="#ffffffff"/>
    </LinearLayout>

</RelativeLayout>

service 布局 服务 继承 设计

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