Question

我想将IntentService发送到嵌入的主Activity。我正在使用广播接收器来广播我从IntentService获得的消息：

public static class ResponseReceiver extends BroadcastReceiver {
        public static final String ACTION_RESP = "com.mypackage.intent.action.MESSAGE_PROCESSED";
        @Override
        public void onReceive(Context context, Intent intent) {
            String text;
            text = intent.getStringExtra(RegistrationIntentService.PARAM_OUT);
            regid = text;
        }
    }

我已经在主Activity的Oncreate方法中注册了接收器。在这种情况下如何发送“文本”？奇怪的是，在这种情况下，regid为null，而“text”具有我想要的字符串数据。

Answer 1

您可以使用意向服务的结果接收者将结果导入活动或片段，请按照以下链接

http://sohailaziz05.blogspot.in/2012/05/intentservice-providing-data-back-to.html

Answer 2

在您的服务中，您可以

Intent intent = new Intent();
intent.setAction(yourActionToMatchBroadcastReceiverIntentFilter);
intent.putExtra(RegistrationIntentService.PARAM_OUT, yourText);
LocalBroadcastManager.getInstance(context).sendBroadcast(intent);

在活动中注册BroadcastReceiver中的onResume()并在onPause()中取消注册。只要您的活动处于活动状态，接收方就会收到您IntentService的意图。

修改

public static class ResponseReceiver extends BroadcastReceiver { MapActivity activity; public ResponseReceiver(MapActivity activity) { this.activity = activity; } @Override public void onReceive(Context context, Intent intent) { activity.regid = intent.getStringExtra(RegistrationIntentService.PARAM_OUT); // do whatever you need here } }

Answer 3

注册时，这对我有用

IntentFilter filter = new IntentFilter(ResponseReceiver.ACTION_RESP);
        filter.addCategory(Intent.CATEGORY_DEFAULT);
        receiver = new ResponseReceiver();

        LocalBroadcastManager.getInstance(this).registerReceiver(receiver, filter);

而不是

registerReceiver(receiver, filter);

@Override
        public void onReceive(Context context, Intent intent) {
            final String text = intent.getStringExtra(RegistrationIntentService.PARAM_OUT);

            button.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    //access the string text and send it to backend
                }
            });
        }

我希望这会对某人有所帮助。像评论中建议的那样发送字符串对我来说不起作用。我在指定ma.regid = text;

的特定行获得了nullpointerexception

Android将IntentService中的消息传递给Activity

3 个答案: