7.5 widget内的内容更新和点击事件

来源：互联网发布：宇宙中的生命知乎编辑：程序博客网时间：2024/05/22 06:18

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1. 在widget类中, 在onEnabled()方法中开启widget跟新的服务;在onDisabled() 方法中停止服务

3. 当点击widget中的按钮的时候发送一条自定义广播

public class MyWidget extends AppWidgetProvider {

private Intent intent;

/**

* 当widget创建的时候

@Override

public void onEnabled(Context context) {

intent= new Intent(context,UpdateWidgetService. class); //开启更新widget的服务

context.startService( intent);

}

/**

* 当widget销毁的时候

@Override

public void onDisabled(Context context) { //关闭更新widget的服务

if( intent!= null){

context.stopService( intent);

}

/**

* 系统半个小时更新次widget

@Override

public void onUpdate(Context context, AppWidgetManager appWidgetManager,

int[] appWidgetIds) {

super.onUpdate(context, appWidgetManager, appWidgetIds);

intent= new Intent(context,UpdateWidgetService. class); //开启更新widget的服务

context.startService( intent);

}

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2. 创建跟新widget的服务, 在服务内创建计时器, 每个一段事件, 利用widget管理器更新app的widget

public class UpdateWidgetService extends Service {

private static final String TAG = "UpdateWidgetService";

private Timer timer; //计时器

private TimerTask timerTask;

private AppWidgetManager awm;

@Override

public IBinder onBind(Intent arg0) {

return null;

}

/**

* 服务创建时

@Override

public void onCreate() {

super.onCreate();

Log. i(TAG, "服务开启" );

awm=AppWidgetManager. getInstance(getApplicationContext());

timer= new Timer();

timerTask= new TimerTask() {

@Override

public void run() {

ComponentName widget= new ComponentName(getApplicationContext(), MyWidget.class );

RemoteViews views= new RemoteViews(getPackageName(), R.layout.process_widget );

views.setTextViewText(R.id. process_count,

"当前进程"+TaskMemoreryUtis.getRuingProcessCount(getApplicationContext())+ "个");

views.setTextViewText(R.id. process_memory,

"当前可用内存:" +Formatter.formatFileSize(getApplicationContext(),

TaskMemoreryUtis. getAvailMem(getApplicationContext())));

Intent intent= new Intent();

intent.setAction( "123.456");

PendingIntent pendingIntent=PendingIntent.getBroadcast(getApplicationContext(), 0,intent,

PendingIntent. FLAG_UPDATE_CURRENT);

views.setOnClickPendingIntent(R.id. btn_clear, pendingIntent);

//更新widget中数据 1.要更新的widget 2.widget显示的view对象

awm.updateAppWidget(widget, views);

}

};

//计时器从widget创建1秒钟开始工作, 每隔2秒钟, 跟新widget中的内容

timer.schedule( timerTask, 1000, 2000);

}

/**

* 当服务关闭时

@Override

public void onDestroy() {

super.onDestroy();

Log. i(TAG, "服务关闭" );

//关闭计时器

timer.cancel();

timerTask.cancel();

timer = null;

timerTask = null;

}

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4. 创建一个自定义广播类, 接收自定义广播, 在类中响应广播事件

public class WigitKillTaskReceiver extends BroadcastReceiver {

private static final String TAG = "WigitKillTaskReceiver";

@Override

public void onReceive(Context context, Intent intent) {

Log. i(TAG, "杀死后台全部进程" );

ActivityManager am=(ActivityManager) context.getSystemService(context .ACTIVITY_SERVICE );

List<RunningAppProcessInfo> runningAppProcesses = am.getRunningAppProcesses();

for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcesses) {

if(runningAppProcessInfo. processName.equals( context.getPackageManager())){

continue;

}

am.killBackgroundProcesses(runningAppProcessInfo. processName);

}

Toast. makeText(context , "清理完毕" ,0).show();

}