Android 消息广播Intent传递数据

<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=".BroadcastActivity" >

    <Button
        android:id="@+id/sendBroadcastIntent"  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="Broadcast Intent"
        />
</RelativeLayout>

public class BroadcastActivity extends Activity {
    //设定为com.china.ui.NEW_LIFEFORM，显示内容前，多一条信息"收到广播信息"；
    //public static final String MY_NEW_LIFEFORM="com.china.ui.NEW_LIFEFORM";
    public static final String MY_NEW_LIFEFORM="NEW_LIFEFORM";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_broadcast);
        //传递数据
        final Intent intent=new Intent(MY_NEW_LIFEFORM);
        intent.putExtra("msgContent", "测试内容");
        //初始化按钮
        Button button=(Button) findViewById(R.id.sendBroadcastIntent);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                sendBroadcast(intent);
            }
        });
    }
}

public class Receiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String content=intent.getStringExtra("msgContent");
        CharSequence string="收到信息:"+content;
        Toast.makeText(context, string, Toast.LENGTH_LONG).show();
    }
}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dh.broadcast"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk   android:minSdkVersion="8"  android:targetSdkVersion="17" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.dh.broadcast.BroadcastActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name="com.dh.broadcast.Receiver" android:enabled="true">
            <intent-filter >
                <!-- <action android:name="com.china.ui.NEW_LIFEFORM"/> -->
                <action android:name="NEW_LIFEFORM"/>
            </intent-filter>
        </receiver>
    </application>
</manifest>