Android 广播接收器仅第二次发射
我正在通过ping到谷歌来检查互联网连接。如果没有网络或响应不成功,我会发送一个广播,其中包含一条没有互联网的消息。每当我在导航抽屉中单击Textview时,它必须检查是否有internet连接。每当没有internet且我单击Textview时,它不会被检查,仅在我第二次单击Textview时才会被检查。BroadcastReceive的onReceive方法不会第一次被调用 代码如下:Android 广播接收器仅第二次发射,android,broadcastreceiver,Android,Broadcastreceiver,我正在通过ping到谷歌来检查互联网连接。如果没有网络或响应不成功,我会发送一个广播,其中包含一条没有互联网的消息。每当我在导航抽屉中单击Textview时,它必须检查是否有internet连接。每当没有internet且我单击Textview时,它不会被检查,仅在我第二次单击Textview时才会被检查。BroadcastReceive的onReceive方法不会第一次被调用 代码如下: public void checkInternetConnection() { c
public void checkInternetConnection()
{
connectivityManager=(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
networkInfo=connectivityManager.getActiveNetworkInfo();
try {
if (networkInfo!=null)
{
if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE || networkInfo.getType() == ConnectivityManager.TYPE_WIFI)
{
OkHttpClient okHttpClient = new OkHttpClient.Builder().
connectTimeout(30, TimeUnit.SECONDS).
writeTimeout(30, TimeUnit.SECONDS).
readTimeout(30, TimeUnit.SECONDS).build();
Request request = new Request.Builder().url(googleurl).build();
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Log.e("error", "error");
e.printStackTrace();
hasInternet1 = false;
Intent intent=new Intent("itrnt_avl");
intent.putExtra("inernet_availability",false);
sendBroadcast(intent);
}
@Override
public void onResponse(Call call, Response response) throws IOException {
Log.e("Response", response.body().string());
if (response.isSuccessful()) {
hasInternet1 = true;
Intent intent=new Intent("itrnt_avl");
intent.putExtra("inernet_availability",true);
sendBroadcast(intent);
} else {
Log.e("Response", "No response");
hasInternet1 = false;
Intent intent=new Intent("itrnt_avl");
intent.putExtra("inernet_availability",false);
sendBroadcast(intent);
throw new IOException("Unexpected code " + response.body().string());
}
}
});
}
else
{
hasInternet1 = false;
Log.e("Response", "No network type");
Intent intent=new Intent("itrnt_avl");
intent.putExtra("inernet_availability",false);
sendBroadcast(intent);
}
}
else {
hasInternet1=false;
Log.e("Response", "network null");
Intent intent=new Intent("itrnt_avl");
intent.putExtra("inernet_availability",false);
sendBroadcast(intent);
}
}
catch (NullPointerException e)
{
e.printStackTrace();
Intent intent=new Intent("itrnt_avl");
intent.putExtra("inernet_availability",false);
sendBroadcast(intent);
}
}
bad_dates.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
drawerlayout.closeDrawers();
checkInternetConnection();
if (broadcastReceiver==null)
{
Log.e("Receiver","Not null");
broadcastReceiver=new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.e("OnReceive","Called");
hasInternet1=intent.getBooleanExtra("inernet_availability",false);
unregisterReceiver(broadcastReceiver);
broadcastReceiver=null;
if (hasInternet1){
new BackgroundTask1().execute();
}
else {
Log.e("Internet Status","No Internet");
Toast.makeText(getApplicationContext(),"Please check your
InternetConnection and try again later",
Toast.LENGTH_SHORT).show();
}
}
};
registerReceiver(broadcasteceiver,new IntentFilter("itrnt_avl"));
}
});
这里的问题是,您首先要调用
checkInternetConnection()
,它发布广播,然后注册广播。也就是说,第一次没有人接收广播
第二次运行checkInternetConnection()
时,您已经第一次注册了接收器,因此它接收广播
因此,您必须先注册广播接收器,然后调用方法checkInternetConnection()
此外,如您在评论中所问,
broadcastReceiver
是注册接收的。方法onReceive()
仅在接收到抵制的广播时才会执行。问题已被编辑。请重新阅读。我可以看到您首先调用方法checkInternetConnection()
,然后注册接收器。你能试着先注册,然后调用方法checkInternetConnection()
?我在checInternetConnection()中发送广播检查是否存在internet后,会不会因为在检查internet之前调用onReceive而导致internet不可用broadcastReceiver
不是通过checkInternetConnection()
发布的广播的接收器?