桌面清小控件之清理进程

在小控件广播中不能执行耗时操作，因为生命周期只有10s，可以开启一个service执行耗时操作

public class AppWidgetProvider extends android.appwidget.AppWidgetProvider {
    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        Intent intent =new Intent(context,KillProcesWidgetService.class);
        context.startService(intent);
    }

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

下面是由控件广播开启的清理进程的服务

public class KillProcesWidgetService extends Service {

    private AppWidgetManager widgetManager;
    private Timer timer;
    private TimerTask task;

    public KillProcesWidgetService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onCreate() {
        super.onCreate();
        //得到桌面小控件的管理者
        widgetManager = AppWidgetManager.getInstance(this);
        timer = new Timer();
        task = new TimerTask() {
            @Override
            public void run() {
                System.out.println("1111111111111111");
                //在别的应用中获取view 使用远程view
                RemoteViews views = new RemoteViews(getPackageName(), R.layout.process_widget);
                /**
                 * 需要注意。这个里面没有findingviewyid这个方法
                 * 设置当前文本里面一共有多少个进程
                 */
                int processCount = SystemInfoUtils.getProcessCount(getApplicationContext());
                //设置文本
                views.setTextViewText(R.id.process_count, "正在运行的软件:" + String.valueOf
                        (processCount));
                //获取到当前手机上面的可用内存
                long availMem = SystemInfoUtils.getAvailMem(getApplicationContext());

                views.setTextViewText(R.id.process_memory, "可用内存:" + Formatter.formatFileSize
                        (getApplicationContext(), availMem));

                Intent intent = new Intent();

                //不能使用显示意图，发送一个隐式意图
                intent.setAction("com.du.safeapp");

                //需要一个延迟意图发送广播来完成相应操作
                PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),
                        0, intent, 0);
                //设置点击事件
                views.setOnClickPendingIntent(R.id.btn_clear, pendingIntent);
                //第一个参数表示上下文
                //第二个参数表示当前有哪一个广播进行去处理当前的桌面小控件
                ComponentName provider = new ComponentName(getApplicationContext(),
                        AppWidgetProvider.class);
                widgetManager.updateAppWidget(provider, views);

            }
        };

        timer.schedule(task, 0, 5000);
    }

    @Override
    public void onDestroy() {

        //优化代码
        if(timer != null || task != null){
            timer.cancel();
            task.cancel();
            timer = null;
            task = null;
        }
    }
}

在服务里是使用隐式意图发送一个清理进程的广播

public class KillProcessAllReceiver extends BroadcastReceiver {
    public KillProcessAllReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {

        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context
                .ACTIVITY_SERVICE);

        //得到手机上面正在运行的进程
        List appProcesses = activityManager.getRunningAppProcesses();

        for (RunningAppProcessInfo runningAppProcessInfo : appProcesses) {
            //杀死所有的进程
            activityManager.killBackgroundProcesses(runningAppProcessInfo.processName);
        }
        Toast.makeText(context, "清理完毕", 0).show();
    }
}