每5分钟重新启动一次android后如何检查互联网连接?

Question

您好，我刚开始学习java，重新启动设备后需要检查互联网连接。但是重新启动后有错误 我的代码： 广播接收器：

public class MainBroadcastReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {
MainService.startService(context);
}
}

服务：

public class MainService extends Service {
public static void startService(Context context) {
context.startService(new Intent(context, MainService.class));
}
Handler handler;
Runnable test;
public MainService() {
handler = new Handler();
test = new Runnable() {
@Override
public void run() {
qqq();
handler.postDelayed(test, 300000); // 5min
}
};
handler.postDelayed(test, 100);
}
public void qqq() {
// Check for Internet Connection
if (isConnected()) {
Toast.makeText(getApplicationContext(), "Internet Connected", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "No Internet Connection", Toast.LENGTH_SHORT).show();
}
}
public boolean isConnected() {
boolean connected = false;
try {
ConnectivityManager cm = (ConnectivityManager)getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo nInfo = cm.getActiveNetworkInfo();
connected = nInfo != null && nInfo.isAvailable() && nInfo.isConnected();
return connected;
} catch (Exception e) {
Log.e("Connectivity Exception", e.getMessage());
}
return connected;
}

但是重新启动后我有消息："您的应用程序已停止！

Answer 1

为此，您需要在清单文件中添加以下权限。

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

希望这有帮助。