Question

我正在开发火炬。我用一个按钮开发了widget。如果你点击那个按钮它会打开火炬，如果你再次点击它会关闭火炬。但是当割炬打开并且用户按下电源按钮关闭屏幕时，它也会关闭割炬。所以我想检查设备是否在火炬打开时进入睡眠模式，有人可以帮助我吗？

这是我在小部件中打开和关闭手电筒的代码

public void onReceive(Context context, Intent intent) {
    Log.d("torchWidget", "onReceive");
    final String action = intent.getAction();
    if(AppWidgetManager.ACTION_APPWIDGET_DELETED.equals(action)) {
        final int appWidgetId = intent.getExtras().getInt(
                AppWidgetManager.EXTRA_APPWIDGET_ID,
                AppWidgetManager.INVALID_APPWIDGET_ID);
        if(appWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID) {
            this.onDeleted(context, new int[] { appWidgetId });
        }
    } else{

        if(intent.getAction().equals(ACTION_WIDGET_RECEIVER)) {
            String msg = "null";
            try{
                msg = intent.getStringExtra("msg");
                msg = "Flash Turned On";
            } catch(NullPointerException e) {
                Log.e("Error", "msg = null");
            }
            if(Constants.isFlashOnWidget){
                Constants.isFlashOnWidget = false;
                Toast.makeText(context, "Flash turned OFF", Toast.LENGTH_SHORT).show();

                 Intent serviceIntent = new Intent(context.getApplicationContext(),
                         BackgroundService.class);

                        context.stopService(serviceIntent);

            } else {   
                Constants.isFlashOnWidget = true;
                 Intent serviceIntent = new Intent(context.getApplicationContext(),
                         BackgroundService.class);

                        context.startService(serviceIntent);

            }

        }
        super.onReceive(context, intent);
    }

Answer 1

从PowerManager系统服务

检查isScreenOn()方法

Answer 2

您的应用或窗口小部件是否可以使用savedInstanceState()保存并稍后检查其状态，如有关恢复活动http://developer.android.com/training/basics/activity-lifecycle/recreating.html的Android文档所述？

如何在android中检查widget是否在后台

2 个答案: