为什么我的接收器没有接收广播?

时间:2012-11-16 04:43:29

标签: android broadcastreceiver intentfilter android-pendingintent proximity

我在使用/理解BroadcastReceivers和IntentFilters方面遇到了困难。我的Test活动中有以下代码。测试活动包含.addProximityAlert,如果.addProximityAlert被触发我想要广播到Test2接收器。我测试时遇到错误。我究竟做错了什么?

测试活动:

public class Test extends BroadcastReceiver
{   
    LocationManager lm;
    ... 
    @Override
    public void onReceive(Context context, Intent intent) 
    {   
        ... 
        final String PROX_ALERT_INTENT = "com.example.proxalert.Test2";
        Intent alert = new Intent(PROX_ALERT_INTENT);
        PendingIntent proximityIntent = PendingIntent.getBroadcast(context, 0, alert, 0);

        lm.addProximityAlert(latitude, longitude, radius, expiration, proximityIntent);

        IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT);
        context.registerReceiver(new Test2(), filter);

Test2接收者:

public class Test2 extends BroadcastReceiver {
    @Override
    public void onReceive(Context arg0, Intent arg1) {
    String key = LocationManager.KEY_PROXIMITY_ENTERING;
        Boolean entering = arg1.getBooleanExtra(key, false);
        if (entering) {
        //toast notification "welcome"
    }
    ...

4 个答案:

答案 0 :(得分:2)

测试扩展了BroadCast接收器,因此必须通知广播才能被激活。你确定那是你想做的吗?

它真的是Android的测试吗?我不这么认为。因此,如果您只需要使用该代码删除Test类,请使用按钮创建一个活动,并在单击该按钮时在Test中执行您的代码。

答案 1 :(得分:1)

您好,在您的活动(或服务)下使用BroadcastReceivers和IntentFilters来表示:

             broadcastReceiver = new BroadcastReceiver() {//global BroadcastReceiver
            @Override
            public void onReceive(Context context, Intent intent) {

                String action = intent.getAction();
                //Action receive
            };

意图过滤器:

        IntentFilter intentfilterTime = new IntentFilter(); 
        intentfilterTime.addAction(Intent.ACTION_BATTERY_CHANGED);//receive battery level change
        registerReceiver(broadcastReceiver, intentfilterTime);

添加您要接收的所有操作。 您的代码不起作用,因为您在另一个内部使用广播我不认为这是您想要的。

答案 2 :(得分:1)

您可以在同一时间注册两个BroadcastReceiver并控制启用,通过简单的方法禁用它们

  • 使用静态/非静态布尔变量
  • 使用偏好设置来保存键值

例如:

public class Test extends BroadcastReceiver
{   
    LocationManager lm;
    ... 
    @Override
    public void onReceive(Context context, Intent intent) 
    {   
    ... 
            final String PROX_ALERT_INTENT = "com.example.proxalert.Test2";
        Intent alert = new Intent(PROX_ALERT_INTENT);
        PendingIntent proximityIntent = PendingIntent.getBroadcast(context, 0, alert, 0);

        lm.addProximityAlert(latitude, longitude, radius, expiration, proximityIntent);

        IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT);
        Test2.someStaticVariable = true;


public class Test2 extends BroadcastReceiver {
    public static boolean someStaticVariable;

    @Override
    public void onReceive(Context arg0, Intent arg1) {

    if (!someStaticVariable){
        return;
    }

    String key = LocationManager.KEY_PROXIMITY_ENTERING;
        Boolean entering = arg1.getBooleanExtra(key, false);
        if (entering) {
        //toast notification "welcome"
    }
    ...

答案 3 :(得分:0)

我能够通过在android清单中注册接收器来使其工作,而不是尝试在test1中动态注册接收器。这个网站确实有所帮助:

http://www.techotopia.com/index.php/Android_Broadcast_Intents_and_Broadcast_Receivers