Question

我无法注册我的BroadcastReceiver。每当我尝试执行我的代码时，它会在logcat中显示“无法注册接收器”。

这是我在注册接收器的代码：

public class Preferences extends PreferenceActivity {
    private Button button;
    ListPreference lp;
    private Context context;
    private long duration;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
        context = this;
        lp = (ListPreference) findPreference("autoduration");
        final Intent intent = new Intent(context, BackService.class);
        lp.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
            public boolean onPreferenceChange(Preference preference, Object newValue) {
                String newSelection = newValue.toString();
                int index = lp.findIndexOfValue(newSelection);
                stopService(intent);
                if (index == 0) {
                    duration = 15000;
                } else if (index == 1) {
                   duration = 12000;
                } else if (index == 2) {
                    duration = 10000;
                } else if (index == 3) {
                    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
                    filter.addAction(Intent.ACTION_SCREEN_OFF);
                    BroadcastReceiver receiver = new ScreenReceiver();
                    registerReceiver(receiver, filter);
                }
                intent.putExtra("duration", duration);
                startService(intent);
                return true;
            }
        });
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);
    }
}

这是我的接收者：

public class ScreenReceiver extends BroadcastReceiver {
    public static boolean screenOn = true;
    private static final String TAG = "ScreenReceiver";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
             screenOn = true;
             Log.e(TAG, "I am receiver");
        } else {
            screenOn = false;
        }
    }
}

Answer 1

在取消注册之前，您的注册码可以被调用2次以上。你确定这不是问题吗？

Answer 2

这有帮助吗？ android.intent.action.SCREEN_ON doesn't work as a receiver intent filter

无法注册BroadcastReceiver

2 个答案: