粘滞广播：广播发送出去以后，广播接收者还没有创建，当广播接收者注册的时候就可以接收，如果不是粘滞广播则如果没有广播接收者就以后不能再接收了。
mainActivity:
package com.sxt.day07_07; import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener; public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent=new Intent("com.sxt.day07_07.my_receiver");
sendStickyBroadcast(intent);//发送粘滞广播，一直停留等着接收者
setListener();
} private void setListener() {
findViewById(R.id.btnStartSecondActivity).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent2=new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent2);//启动SecondActivity
}
});
} }
SecondActivity
package com.sxt.day07_07; import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.Menu; public class SecondActivity extends Activity {
MyReceiver mReceiver;
Intent mIntent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
registerReceiver();
}
private void registerReceiver() {
mReceiver=new MyReceiver();
IntentFilter filter=new IntentFilter("com.sxt.day07_07.my_receiver");
registerReceiver(mReceiver, filter);
} //内部类，只有SecondActivity启动了，MyReceiver才能注册接收广播。
class MyReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Log.i("main","MyReceiver.onReceive()");
mIntent=intent;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
removeStickyBroadcast(mIntent);//移出，移出以后就收不到广播了
unregisterReceiver(mReceiver);//移出接收者
}
}
系统描述文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sxt.day07_07"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.BROADCAST_STICKY"/> 粘滞广播要申请权限
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.sxt.day07_07.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.sxt.day07_07.SecondActivity"
android:label="@string/title_activity_second" >
</activity>
</application> </manifest>
main页面：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"> <Button
android:id="@+id/btnStartSecondActivity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/hello_world" /> </RelativeLayout>
second页面：
<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=".SecondActivity" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" /> </RelativeLayout>