Android之Pendingintent学习

在android的sample之sipdemo中，用到了pendingintent,用来接受Incoming call，实质上，就是将接受到的sip response放在intent中，再交由Pendingintent广播出去，为了能够接受到广播消息，所以要注册一个广播接收器，用于接收设定好Action的PendingIntent的广播消息，从而抓获intent中的sip消息。这样处理的巧妙之处，就是避免在sip接受模块中又去调用sip处理模块，模块与模块之间的独立性得到了保障。

为此，我自己也写了个简单的pendingintent的小程序，用来演示这一有趣的trick。

只有两个类，一个是PendingintenttestActivity.java，包涵了UI，和消息发送函数。还有一个就是pendingintentrecv.java,继承了broadcastreciver，处理接受到的消息，并且打印到UI上。

PendingintenttestActivity.java：

package edu.pendingintenttest;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.PendingIntent.CanceledException;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class PendingintenttestActivity extends Activity {
	private pendingintentrecv tesPendingintentrecv;
	private TextView txt_send;
	private PendingIntent pendingIntent;
	private TextView txt_recv;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //注册一个intent filter ,添加自定义的action,并且注册我们的广播接收器
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.pendingtest");
        tesPendingintentrecv = new pendingintentrecv();
        this.registerReceiver(tesPendingintentrecv, filter);
        
        txt_send = (TextView)findViewById(R.id.editText1);
        txt_recv = (TextView)findViewById(R.id.editText2);
        
//创建一个pendingintent ，注意action要与我们自定义的action一致

        Intent intent = new Intent(); 
        intent.setAction("android.pendingtest"); 
        pendingIntent = PendingIntent.getBroadcast(this, 0, intent, Intent.FILL_IN_DATA); 
       
    }
    
    public void btn_sendbread(View v){
    	String text = txt_send.getText().toString();
    	  try {
         	Intent intent1 = new Intent(); 
             intent1.setAction("android.pendingtest"); 
             intent1.putExtra("bread", text);
 			pendingIntent.send(getBaseContext(), 1234124, intent1);
 		} catch (CanceledException e) {
 			// TODO Auto-generated catch block
 			e.printStackTrace();
 		}
    }
    
    public void updatestatus(String msg)
    {
    	final String msgget = msg;
    	this.runOnUiThread(new Runnable() {
			 
			@Override
			public void run() {
				txt_recv.setText(msgget);
				// TODO Auto-generated method stub
				
			}
		});
    }
}

pendingintentrecv.java：

package edu.pendingintenttest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;

public class pendingintentrecv extends BroadcastReceiver{

	private PendingintenttestActivity pta;
	@Override
	public void onReceive(Context context, Intent arg1) {
		// TODO Auto-generated method stub
		Log.d("pendingtest", "get intent");
		Intent intent = arg1;
		Bundle data =intent.getExtras();
		pta=(PendingintenttestActivity) context;
		pta.updatestatus(data.get("bread").toString());
	}
	
}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn_sendbread"
        android:text="sendpendingintent" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Get what?"
        android:ems="10" />


</LinearLayout>

在第一行的edittext中输入内容，就可以在广播接受器中将内容打印出来在第三行的edittext.