此实例实现功能为在不打开新的Activity的前提下，从BroadcastReceiver传递数据给Activity

实现很简单，但使用到了自定义广播，以免遗忘在此记录：

代码

以通过广播读取短信再传递给前台Activity进行显示为例

• AndroidManifest文件

    <uses-permission android:name="android.permission.RECEIVE_SMS" />

• xml文件

<?xml version="1.0" encoding="utf-8"?>
<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" tools:context=".MainActivity" >

    <EditText  android:id="@+id/main_et" android:hint="短信内容!" android:layout_centerInParent="true" android:layout_width="match_parent" android:layout_height="wrap_content" />
</RelativeLayout>

• BroadcastReceiver文件

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;

public class SMSBroadcastReceiver extends BroadcastReceiver{
    //指定动作的名称
    public static final String ACTION = "android.provider.Telephony.SMS_RECEIVED"; 

    @Override  
    public void onReceive(Context context, Intent intent) {  
        if (ACTION.equals(intent.getAction())) {
            //根据接收到的意图对象获取短信
            SmsMessage[] msgs = getMessageFromIntent(intent);
            //提取短信内容 
            StringBuilder sBuilder = new StringBuilder();  
            if (msgs != null && msgs.length > 0 ) {  
                for (SmsMessage msg : msgs) {  
                    sBuilder.append("接收到了短信：\n发件人是：");  
                    sBuilder.append(msg.getDisplayOriginatingAddress());  
                    sBuilder.append("\n------短信内容-------\n");
                    sBuilder.append(msg.getDisplayMessageBody()); 
                }  
            }

            Intent mIntent=new Intent("ReadSMS");
            mIntent.putExtra("sms", sBuilder.toString());
            context.sendBroadcast(mIntent);
        }       
    }  

    //从意图获取短信对象的具体方法
    public static SmsMessage[] getMessageFromIntent(Intent intent) {  
        SmsMessage retmeMessage[] = null;  
        Bundle bundle = intent.getExtras();  
        Object pdus[] = (Object[]) bundle.get("pdus");  
        retmeMessage = new SmsMessage[pdus.length];  
        for (int i = 0; i < pdus.length; i++) {  
            byte[] bytedata = (byte[]) pdus[i];  
            retmeMessage[i]  = SmsMessage.createFromPdu(bytedata);  
        }  
        return retmeMessage;
    }
}

• Activity文件

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.text.TextUtils;
import android.widget.EditText;

import com.example.locationdemo2.R;

public class MainActivity extends Activity {
    private EditText editText;
    private MyBroadcastReceiver myBroadcastReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.main_et);
        myBroadcastReceiver = new MyBroadcastReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction("ReadSMS");
        registerReceiver(myBroadcastReceiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myBroadcastReceiver);
    }

    private class MyBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals("ReadSMS")) {
                System.out.println("收到广播!");
                String stringExtra = intent.getStringExtra("sms");
                if (!TextUtils.isEmpty(stringExtra)) {
                    editText.setText(stringExtra);
                    System.out.println(stringExtra);
                }
            }
        }
    }
}