接收廣播系統
1.新建一個項目BroadcastTest
2.修改MainActivity:
package com.example.broadcasttest; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; private IntentFilter intentFilter; private NetworkChangeReceive networkChangeReceive; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); intentFilter = new IntentFilter(); intentFilter.addAction("網絡改變"); networkChangeReceive = new NetworkChangeReceive(); registerReceiver(networkChangeReceive,intentFilter); Toast.makeText(this.getBaseContext(),"開始了啊", Toast.LENGTH_SHORT ).show(); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(networkChangeReceive); } class NetworkChangeReceive 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,"network is 可用", Toast.LENGTH_SHORT ).show(); Log.d(TAG, "onReceive:可用 "); }else { Toast.makeText(context,"network is 不能用", Toast.LENGTH_SHORT ).show(); Log.d(TAG, "onReceive:不能用 "); } } } }
這個當打開和關閉數據的時候彈出提醒
靜態註冊實現開機啓動:
New - > Other ->Broadcast Reciver 新建一個BootCompleteReceiver:
package com.example.broadcasttest; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.widget.Toast; public class BootCompleteReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { // throw new UnsupportedOperationException("Not yet implemented"); Toast.makeText(context,"Boot 完成 ",Toast.LENGTH_LONG).show(); } }
修改AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.broadcasttest"> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <receiver android:name=".BootCompleteReceiver" android:enabled="true" android:exported="true"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED"/> </intent-filter> </receiver> </application> </manifest>