单击按钮时如何在BroadcastReceiver上启动新活动

时间:2014-09-18 13:22:34

标签: android android-intent android-activity android-fragments broadcastreceiver

我正在尝试创建应用程序,可以扩展“BroadcastReceiver”,并且在xml GUI上有一个按钮,当我按下它时,我正在尝试打开新的Activity(GUI)。我知道在扩展Activity时如何做到这一点,但是当我扩展BroadcastReceiver时却不知道。这是我的java代码:

import info.kfsoft.android.R.raw;
import android.app.Notification;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.widget.TextView;
import android.widget.Toast;

public class SMSReceiver extends BroadcastReceiver
{

    MediaPlayer ourSong;
    TextView display;


    public void onReceive(Context context, Intent intent)
    {
        NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        ourSong = MediaPlayer.create(context, R.raw.music2);


        Bundle myBundle = intent.getExtras();
        SmsMessage [] messages = null;
        String strMessage = "";

        if (myBundle != null)
        {
            Object [] pdus = (Object[]) myBundle.get("pdus");
            messages = new SmsMessage[pdus.length];

            for (int i = 0; i < messages.length; i++)
            {
                messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
               strMessage += messages[i].getMessageBody();                  
           }            
            Toast.makeText(context, strMessage, Toast.LENGTH_SHORT).show();

            AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
                am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);            
            Toast.makeText(context, strMessage, Toast.LENGTH_SHORT).show();            
            ourSong.start();           
        }
    }
    public void a(){

    }

}

这是我的xml RelativeLayout,可以使用以前的java代码:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="info.kfsoft.android.MainActivity$PlaceholderFragment" >

    <TextView
        android:id="@+id/msg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/cmd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/msg"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="98dp"
        android:text="Button" />

</RelativeLayout>

现在我想在按下按钮时打开新意图(WITH @ + ID / CMD):

这是新意图的Jave代码:

public class AboutUs extends Activity{

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.about);
        }

    }

2 个答案:

答案 0 :(得分:2)

一个简单的答案是,你可以像这样从Receiver开始一个Activity:

     Intent i = new Intent(context.getApplicationContext(), AboutUs.class);        
     i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     context.startActivity(i);

这是您从Receiver开始活动的方式。但是你必须先从另一个活动发送广播来“唤醒”你的BroadcastReceiver。

答案 1 :(得分:0)

点击按钮

 OnClickListener listnr=new OnClickListener() {

                  @Override

                  public void onClick(View v) {

  Intent i = new Intent(context.getApplicationContext(), NewActivity.class);        

     context.startActivity(i);



                  }

            };

            Button btn =(Button) findViewById(R.id.btn);

            btn.setOnClickListener(listnr);