Broadcast--本地广播

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我是靠谱客的博主曾经小伙，这篇文章主要介绍Broadcast--本地广播，现在分享给大家，希望可以做个参考。

本地广播

android中本地广播机制，只允许广播在本程序中发送和接收，这样当在广播中包含信息时，也不会有信息的泄露的危险。
本地广播的用法：使用一个LocalBroadcastManager来对广播进行管理，并提供了广播的发送和接收的方法。
首先自定义广播接收器

复制代码

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public class MyLocalReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "这是一条本地广播", Toast.LENGTH_SHORT).show();
}
}

然后使用LocalBroadcastManager在代码中对广播接收器进行注册和取消注册。

复制代码

public class MainActivity extends AppCompatActivity
implements View.OnClickListener{
private Button button;
private MyLocalReceiver myLocalReceiver;
private LocalBroadcastManager localBroadcastManager;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button= (Button) findViewById(R.id.button_local);
button.setOnClickListener(this);
//获取实例
localBroadcastManager=LocalBroadcastManager.getInstance(this);
myLocalReceiver=new MyLocalReceiver();
//设置intentFilter的值
IntentFilter intentFilter=new IntentFilter("com.lingzhuo.LOCAL_BROADCAST");
localBroadcastManager.registerReceiver(myLocalReceiver,intentFilter);
}
@Override
protected void onDestroy() {
super.onDestroy();
localBroadcastManager.unregisterReceiver(myLocalReceiver);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button_local:
Intent intent=new Intent();
intent.setAction("com.lingzhuo.LOCAL_BROADCAST");
localBroadcastManager.sendBroadcast(intent);
break;
}
}
}

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public class MainActivity extends AppCompatActivity
implements View.OnClickListener{
private Button button;
private MyLocalReceiver myLocalReceiver;
private LocalBroadcastManager localBroadcastManager;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button= (Button) findViewById(R.id.button_local);
button.setOnClickListener(this);
//获取实例
localBroadcastManager=LocalBroadcastManager.getInstance(this);
myLocalReceiver=new MyLocalReceiver();
//设置intentFilter的值
IntentFilter intentFilter=new IntentFilter("com.lingzhuo.LOCAL_BROADCAST");
localBroadcastManager.registerReceiver(myLocalReceiver,intentFilter);
}
@Override
protected void onDestroy() {
super.onDestroy();
localBroadcastManager.unregisterReceiver(myLocalReceiver);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button_local:
Intent intent=new Intent();
intent.setAction("com.lingzhuo.LOCAL_BROADCAST");
localBroadcastManager.sendBroadcast(intent);
break;
}
}
}