Android Studio 学习广播 _Android

一年好景君须记，最是橙黄橘绿时。这篇文章主要讲述Android Studio 学习广播相关的知识，希望能为你提供帮助。
动态注册监听网络变化

创建intentFilter 并addAction 代表了监听哪个广播
然后使用registerReceiver()方法将intentFilter 与自己创建的监听器传进去
动态注册的需要unregisterReciver()
权限需要在Mainfest中声明 < uses-permission android :name "android.permission.ACCESS_NETWORK.STATE"/>

public class MainActivity extends AppCompatActivity {
private IntentFilter intentFilter;
private NetworkChangedReceiver networkChangedReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intentFilter = new IntentFilter();
intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
networkChangedReceiver = new NetworkChangedReceiver();
registerReceiver(networkChangedReceiver,intentFilter);
}

@Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(networkChangedReceiver); } class NetworkChangedReceiver extends BroadcastReceiver { @Override public void onReceive (Context context,Intent intent) { ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if(networkInfo!=null & & networkInfo.isAvailable()) { Toast.makeText(context,"good",Toast.LENGTH_LONG).show(); } else { Toast.makeText(context,"bad",Toast.LENGTH_LONG).show(); }} }

}
静态注册实现开机启动

new-> other-> broadcast receiver 手动创建广播
exported 允许此广播接收本程序外的广播

之后再Mainfest中声明权限
并说明要监听的广播

发送广播

Intent intent = new Intent("com....")
sendBroadcast(intent);
sendOrderedBroadcast(intent，null); 发送有序广播
< intent- filter android :priority="100"> //设置广播优先级
abortBroadcast（）截断广播

本地广播public class MainActivity extends AppCompatActivity {
private IntentFilter intentFilter;
private LocalReceiver localReceiver;
private LocalBroadcastManager localBroadcastManager;

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //得到本地广播管理器的实例 localBroadcastManager = LocalBroadcastManager.getInstance(this); //动态注册本地广播接收器 intentFilter = new IntentFilter(); intentFilter.addAction("com.example.broadcasttest.LOCAL_BROADCAST"); localReceiver = new LocalReceiver(); localBroadcastManager.registerReceiver(localReceiver, intentFilter); //发送本地广播 Button button = (Button) findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent("com.example.broadcasttest.LOCAL_BROADCAST"); localBroadcastManager.sendBroadcast(intent); } }); }@Override protected void onDestroy() { super.onDestroy(); //取消动态网络变化广播接收器的注册 localBroadcastManager.unregisterReceiver(localReceiver); }class LocalReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, "received local broadcast", Toast.LENGTH_SHORT).show(); } }

【Android Studio 学习广播】}