Android基础篇 静态注册 and 动态注册 BroadcastReceiver系列
Posted 彭老希
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一、静态注册 【仅在安卓7.0及其以下能运行】
1、布局文件
<?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:id="@+id/activity_main"
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.example.lenovo.broadcasttest.MainActivity">
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Send Broadcast"/>
</RelativeLayout>
2、静态注册
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button) findViewById(R.id.button);
//这里是指发送一条信息,让广播接收,如果不发,静态广播在任意处接收了意向的ACTION都会响应,这里可以设置成缓存的信息,开启服务后,读取缓存,接收执行静态广播的响应
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
//监听有com.example.broadcasttest.MY_BROADCAST这条广播的接收器会收到消息
Intent intent = new Intent("com.example.broadcasttest.MY_BROADCAST");
sendBroadcast(intent);
}
});
}
}
3、(广播)MyBroadcastReceiver.java
public class MyBroadcastReceiver extends BroadcastReceiver {
public MyBroadcastReceiver() {
}
@Override
public void onReceive(Context context, Intent intent) {
//执行某些操作,但不要进行耗时操作
Toast.makeText(context,"欢迎关注彭老希",Toast.LENGTH_SHORT).show();
}
}
4、AndroidManifest.xml 注册 --> 静态注册的表现
<receiver
android:name=".MyBroadcastReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<-- 自定义name -->
<action android:name="com.example.broadcasttest.MY_BROADCAST"/>
</intent-filter>
</receiver>
二、动态注册
public class MainActivity extends AppCompatActivity {
//自定义广播的变量
private MyBroadcastReceiver myBroadcastReceiver;
//Intent意向过滤
private IntentFilter intentFilter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intentFilter = new IntentFilter();
//这里定义接受器监听广播的类型,这里添加相应的广播
intentFilter.addAction("com.example.broadcasttest.MY_BROADCAST");
//实例化接收器
myBroadcastReceiver=new MyBroadcastReceiver();
//动态注册 :注册事件,将监听类型赋给对应的广播接收器
registerReceiver(myBroadcastReceiver,intentFilter);
Button button=(Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
//这是一条自定义标准广播-----所有监听com.example.broadcasttest.MY_BROADCAST这条广播的接收器都会收到消息
Intent intent=new Intent("com.example.broadcasttest.MY_BROADCAST");
sendBroadcast(intent);
}
});
}
@Override
protected void onDestroy(){
super.onDestroy();
//注销事件
unregisterReceiver(myBroadcastReceiver);
}
}
(广播)MyBroadcastReceiver.java
public class MyBroadcastReceiver extends BroadcastReceiver {
public MyBroadcastReceiver() {
}
@Override
public void onReceive(Context context, Intent intent) {
//广播接收器仅仅定义了对监听到的广播的反应,没有定义监听的类型(在MainActivity.java中动态注册)
Toast.makeText(context,"欢迎关注彭老希",Toast.LENGTH_SHORT).show();
}
}
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