标签：
本实例只有1个界面（Activity），界面上包涵一个EditText及一个按钮。当按钮被按下时，获取EditText中的内容并广播。本实例还创建了一个BroadcastReceiver，用于接收按钮按下时的广播，并将广播消息内容显示于通知栏。当点击通知栏的广播消息时另一个Activity将会被打开。完成后显示效果如下：
编程实现
1、新建一个android项目（过程省略），添加需要的文件。添加后，此项目工程目录如下：
2、编辑activity_main.xml，添加一个EditText和一个按钮，完成后内容大致如下：
<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="com.broadcastreceiver.broadcastreceiverproject.MainActivity$PlaceholderFragment" > <EditText android:id="@+id/editText1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:ems="10" android:hint="@string/textEdit1_text" android:inputType="text" > </EditText> <Button android:id="@+id/button1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/editText1" android:layout_below="@+id/editText1" android:layout_marginTop="14dp" android:text="@string/button1_text" /> </RelativeLayout>
3、编辑MainActivity.java文件，MainActivity.java中定义了类MainActivity。MainActivity继承自Activity，以activity_main.xml定义的界面为显示界面。当activity_main.xml上的按钮按下时，获取EditText的内容并发送广播。MainActivity.java内容如下：
package com.broadcastreceiver.broadcastreceiverproject; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import android.content.Context; import android.content.Intent; public class MainActivity extends Activity { private Context mContext; private Button btnSendBroadcast; private EditText etBroadcastContent; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = this; btnSendBroadcast = (Button)findViewById(R.id.button1); btnSendBroadcast.setOnClickListener(new btnSendBroadcast_Listener()); etBroadcastContent = (EditText)findViewById(R.id.editText1); } private class btnSendBroadcast_Listener implements View.OnClickListener { @Override public void onClick(View v) { String content = etBroadcastContent.getText().toString().trim(); if (content.length() < 1) { Toast.makeText(mContext, etBroadcastContent.getHint(), Toast.LENGTH_SHORT).show(); return; } Intent intent = new Intent(); intent.setAction("com.eoeandroid.action.BroadcastReceiverTest"); intent.putExtra("msg_content", content); sendBroadcast(intent); } } }
4、编辑HelloBroadcastReceiver.java文件，此文件中定义了广播接收器BroadcastReceiver，用于接收MainActivity中发送的广播。接收到广播后，将广播的内容显示与通知栏。HelloBroadcastReceiver.java文件内容如下：
package com.broadcastreceiver.broadcastreceiverproject; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.app.NotificationManager; import android.app.Notification; import android.app.PendingIntent; public class HelloBroadcastReceiver extends BroadcastReceiver { private Context context; @Override public void onReceive(Context context, Intent intent) { this.context = context; showNotification(intent); } //通知栏显示消息 private void showNotification(Intent intent) { NotificationManager notificationManager = (NotificationManager)context .getSystemService(Context.NOTIFICATION_SERVICE); //一组将被执行的Intent集合 Intent aIntent[] = new Intent[1]; aIntent[0] = new Intent(context, MainActivity.class); PendingIntent pendingIntent = PendingIntent.getActivities(context, 0, aIntent, 0); String title = intent.getExtras().getString("msg_content"); Notification noti = new Notification.Builder(context) .setContentTitle(title.subSequence(0, title.length())) .setContentText(title.subSequence(0, title.length())) .setSmallIcon(R.drawable.ic_launcher) .setWhen(System.currentTimeMillis()) .setContentIntent(pendingIntent) //调用后当通知栏消息被点击时，Intent集合被执行 .build(); notificationManager.notify(R.layout.activity_main, noti); } }
5、最后需要注册广播接收器，本实例采用静态方式注册。在AndroidManifest.xml的<application>内添加以下内容：
<receiver android:name=".HelloBroadcastReceiver" android:exported="false"> <intent-filter> <action android:name="com.eoeandroid.action.BroadcastReceiverTest"/> </intent-filter> </receiver>
标签：
原文地址：http://www.cnblogs.com/xiaojihua20/p/4186882.html
