android Widget 桌面小图标,类似快捷方式

步骤一：清单文件配置

receiver必须是AppWidgetProvider的子类

通过intent-filter过滤指定的android.appwidget.action.APPWIDGET_UPDATE动作

除此之外，还需配置meta-data属性，其中name为指定字段，

resource为欲添加小图标时显示的样式

<receiver android:name=".Receiver.ProcessReceiver">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"></action>
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/process_widget"></meta-data>
</receiver>
<receiver android:name=".Receiver.KillProcessReceiver">
<intent-filter>
<action android:name="cn.gzu.edu.action.killprocess"></action>
</intent-filter>
</receiver>

//resource配置模板

/**

*minWidth 桌面显示的最小宽度

*minHeight 桌面显示的最小高度，以上两个参数决定改桌面图标的风格

*initialLayout 图标显示时加载的布局文件，可以是指定宽高的任意布局文件，但建议尽量简单

process_widget.xml为自定义的布局

*/

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="290dp"
android:minHeight="72dp"
android:initialLayout="@layout/process_widget" >
</appwidget-provider>

步骤二：建立ProcessReceiver，即AppWidgetProvider的子类，用于处理相应的业务

示例为一个清理进程服务的启动为停止

public class ProcessReceiver extends AppWidgetProvider {

@Override
public void onEnabled(Context context) {
super.onEnabled(context);
Intent intentStart=new Intent(context,ProcessWidgetService.class);
context.startService(intentStart);
}

@Override
public void onDeleted(Context context, int[] appWidgetIds) {
super.onDeleted(context, appWidgetIds);
}

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
}

@Override
public void onDisabled(Context context) {
super.onDisabled(context);
Intent intentStop=new Intent(context,ProcessWidgetService.class);
context.stopService(intentStop);
}

}

步骤三：桌面图标的业务处理

1，得到AppWidgetManager实例，如同activityManager与PackageManager一样

2，建立组件，即将服务与图标建立连接

3，建立RemoteViews对象，即可操作图标上的子组件

与普通activity不同的是，这里不能findView，而只能通过setTextViewText

之类操作子组件。

4，通过PendingIntent发出广播，设置相应的action

setOnClickPendingIntent为子组件的点击事件注册点击处理逻辑

最后交给广播接收者处理业务逻辑

public class ProcessWidgetService extends Service {
private Timer timer;

private TimerTask task=new TimerTask(){

@Override
public void run() {
AppWidgetManager awManager=AppWidgetManager.getInstance(getApplicationContext());
ComponentName provider=new ComponentName(getApplicationContext(), ProcessReceiver.class);
RemoteViews remoteViews=new RemoteViews(getPackageName(), R.layout.process_widget);
int processSize=TaskProcessUtil.getRunningAppSize(getApplicationContext());
remoteViews.setTextViewText(R.id.process_count, "运行总进程数："+processSize+"个");
long memory=TaskProcessUtil.getSystemAviMemory(getApplicationContext());
remoteViews.setTextViewText(R.id.process_memory, "剩余内存："+TextFormat.formatByte(memory));

Intent intent=new Intent(getApplicationContext(),KillProcessReceiver.class);
intent.setAction("cn.gzu.edu.action.killprocess");
PendingIntent pendingIntent=PendingIntent.getBroadcast(getApplicationContext(), 100, intent, 0);

remoteViews.setOnClickPendingIntent(R.id.process_widget_btn_clear, pendingIntent);
awManager.updateAppWidget(provider, remoteViews);
}};

@Override
public void onCreate() {
super.onCreate();
//不断的对widget里面的数据进行更新   用定时器来实现
timer=new Timer();
timer.schedule(task,0 ,1000);
}

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

@Override
public void onDestroy() {
super.onDestroy();
task.cancel();
task=null;
}