[Android]从BroadcastReceiver到Activity的通信

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); } } } } }