android 自动启动应用程序

android 监听一些系统的广播可以帮助我们做很多事情 比如 启动应用，app数据同步，闹钟提醒等等

广播 监听网络 启动应用

manifest

 <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE"></action>
            </intent-filter>
        </receiver>

public class MyReceiver extends BroadcastReceiver {
    public MyReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {

        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mobileInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        NetworkInfo wifiInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        NetworkInfo activeInfo = manager.getActiveNetworkInfo();
        if((mobileInfo.isConnected() || wifiInfo.isConnected()) && activeInfo != null) {
            Intent intent1 = new Intent(context,MainActivity.class);
            intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent1);
        }
        Toast.makeText(context,"网络变化",Toast.LENGTH_LONG).show();
    }
}

但是监听这也系统的广播也是很浪费系统资源的。