如何使用registerReceiver方法？ [英] How to use registerReceiver method?

问题描述

我想使用动态注册的BroadcastReceiver ，有一个参考的活动所以它可以修改它的UI。我使用 Context.registerReceiver（）的方法，但接收器的的onReceive（）方法不会被调用。

下面是示例code显示问题：

 包com.example;

进口android.app.Activity;
进口android.app.IntentService;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.KeyEvent;

公共类RegisterBroadcastReceiver延伸活动{

    公共静态类MyIntentService扩展IntentService {

        公共MyIntentService（）{
            超级（MyIntentService.class.getSimpleName（））;
        }

        @覆盖
        保护无效onHandleIntent（意向意图）{
            意图I =新的意图（这一点，MyBroadcastReceiver.class）;
            sendBroadcast（ⅰ）;
        }
    }

    公共类MyBroadcastReceiver扩展的BroadcastReceiver {

        @覆盖
        公共无效的onReceive（上下文的背景下，意图意图）{
            Log.i（MyBroadcastReceiver.class.getSimpleName（），
                  接收到的广播）;
        }

    }

    / **第一次创建活动时调用。 * /
    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
    }

    MyBroadcastReceiver mReceiver =新MyBroadcastReceiver（）;

    @覆盖
    保护无效onResume（）{
        super.onResume（）;

        IntentFilter的IntentFilter的=新的IntentFilter（）;
        registerReceiver（mReceiver，IntentFilter的）;
    }

    @覆盖
    公共布尔的onkeydown（INT键code，KeyEvent的事件）{
        如果（键code == KeyEvent.KEY code_MENU）{
            意图I =新的意图（这一点，MyIntentService.class）;
            startService（ⅰ）;
        }
        返回super.onKeyDown（键code，事件）;
    }

    @覆盖
    保护无效的onPause（）{
        super.onPause（）;
        unregisterReceiver（mReceiver）;
    }

}
 

解决方案

整个code。如果有人需要它。

 无效报警（上下文的背景下，日历C）
{
    AlarmManager ALRM =（AlarmManager）context.getSystemService（ALARM_SERVICE）;
    最后弦乐SOME_ACTION =com.android.mytabs.MytabsActivity.AlarmReceiver;
    IntentFilter的IntentFilter的=新的IntentFilter（SOME_ACTION）;
    AlarmReceiver mReceiver =新AlarmReceiver（）;
    context.registerReceiver（mReceiver，IntentFilter的）;
    意图I2 =新的意图（SOME_ACTION）;
    PendingIntent圆周率= PendingIntent.getBroadcast（上下文，0，I2，0）;
    alrm.set（AlarmManager.RTC_WAKEUP，c.getTimeInMillis（），PI）;
    Toast.makeText（背景下，增加，Toast.LENGTH_LONG）.show（）;
}

类AlarmReceiver扩展的BroadcastReceiver {
    @覆盖
公共无效的onReceive（上下文的背景下，意图ARG1）{
        // TODO自动生成方法存根
        Toast.makeText（背景下，开始，Toast.LENGTH_LONG）.show（）;
    }
}
 

I want to use dynamically registered BroadcastReceiver that has a reference to an Activity so it can modify its UI. I am using Context.registerReceiver() method but receiver's onReceive() method is never called.

Here is the sample code showing the problem:

package com.example;

import android.app.Activity;
import android.app.IntentService;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;

public class RegisterBroadcastReceiver extends Activity {

    public static class MyIntentService extends IntentService {

        public MyIntentService() {
            super(MyIntentService.class.getSimpleName());
        }

        @Override
        protected void onHandleIntent(Intent intent) {
            Intent i = new Intent(this, MyBroadcastReceiver.class);
            sendBroadcast(i);
        }
    }

    public class MyBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i(MyBroadcastReceiver.class.getSimpleName(),
                  "received broadcast");
        }

    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    MyBroadcastReceiver mReceiver = new MyBroadcastReceiver();

    @Override
    protected void onResume() {
        super.onResume();

        IntentFilter intentFilter = new IntentFilter();
        registerReceiver(mReceiver, intentFilter);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_MENU) {
            Intent i = new Intent(this, MyIntentService.class);
            startService(i);
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(mReceiver);
    }

}

解决方案

The whole code if somebody need it.

void Alarm(Context context, Calendar c) 
{
    AlarmManager alrm = (AlarmManager)context.getSystemService(ALARM_SERVICE);
    final String SOME_ACTION = "com.android.mytabs.MytabsActivity.AlarmReceiver";
    IntentFilter intentFilter = new IntentFilter(SOME_ACTION);
    AlarmReceiver mReceiver = new AlarmReceiver();
    context.registerReceiver(mReceiver, intentFilter);
    Intent i2 = new Intent(SOME_ACTION);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, i2, 0);
    alrm.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);
    Toast.makeText(context, "Added", Toast.LENGTH_LONG).show();
}

class AlarmReceiver extends BroadcastReceiver {     
    @Override
public void onReceive(Context context, Intent arg1) {
        // TODO Auto-generated method stub
        Toast.makeText(context, "Started", Toast.LENGTH_LONG).show();
    }
}

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