在没有互联网的设备上隐藏Firebase上的ProgressDialog [英] Hide a ProgressDialog over Firebase on a device without internet
问题描述
$ b $ ul
$ b $ p
完美地工作，但问题当设备没有互联网连接，在这种情况下进展对话总是展出，我想做什么，当设备没有互联网是关闭进展，并显示一个错误信息。
这是我的代码：
showProgessDialog（）;
FirebaseDatabase数据库= FirebaseDatabase.getInstance（）;
DatabaseReference myRef = database.getReference（hello）;
DatabaseReference connectedRef = FirebaseDatabase.getInstance（）。getReference（。info / connected）;
$ b $ connectedRef.addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot snapshot）{
boolean connected = snapshot.getValue（Boolean.class） ;
if（connected）{
Log.d（Constans.LOG，1.- datachange connected）;
hideProgressDialog（）;
} else {
Log.d（Constans.LOG，2.- datachange disconnected）;
showProgessDialog（）;
}
}
@Override
public void onCancelled（DatabaseError error）{
System.err.println（3.- datachange cancelled）;
}
}）;
myRef.addListenerForSingleValueEvent（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot dataSnapshot）{
Log.d（Constans.LOG，4。 - myRef addListenerForSingleValueEvent onDataChange）;
}
@Override
public void onCancelled（DatabaseError databaseError）{
Log.d（Constans.LOG，5.- myRef addListenerForSingleValueEvent cancell）;
}
}）;
$ b myRef.addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot dataSnapshot）{
Log.d（Constans.LOG ，6.- myRef addValueEventListener onDataChange）;
String value = dataSnapshot.getValue（String.class）;
mAboutMe.setText（value）;
}
@Override
public void onCancelled（DatabaseError error）{
Log.d（Constans.LOG，7.- myRef addValueEventListener error+ error.getDetails（））;
}
}）;
正如您所看到的，所有被调用的方法在Log行中都有一个数字，方法调用顺序是：
$ block
$ 2
$ b $ $ $
$ b
当没有互联网被称为
2
我无法关闭进度，打开它。
使用Firebase框架可以做什么？
您可以使用此类的isConnected方法检查设备的Internet连接。然后在没有互联网连接的情况下关闭进度对话框
pre $ c $ public class InternetConnectionDetector
private Context context ;
public InternetConnectionDetector（Context context）
{
this.context = context;
$ b public boolean isConnected（）
{
ConnectivityManager connectivityManager =（ConnectivityManager）context.getSystemService（Context.CONNECTIVITY_SERVICE）;
//在检测到网络连接时，apk棒棒糖会发生变化：
//如果用户的os更新，然后棒棒糖：
if（Build.VERSION.SDK_INT> = Build。 VERSION_CODES.LOLLIPOP）
{
Network [] networks = connectivityManager.getAllNetworks（）;
NetworkInfo networkInfo;
（Network mNetwork：networks）
{
networkInfo = connectivityManager.getNetworkInfo（mNetwork）;
if（networkInfo.getState（）。equals（NetworkInfo.State.CONNECTED））
{
return true;
$ b //如果用户的操作系统比较老，那么lollipop：
else
{
// getAllNetworkInfo method仅在API 19之前工作：
NetworkInfo [] info = connectivityManager.getAllNetworkInfo（）;
$ b $ if（info！= null）
{
for（NetworkInfo anInfo：info）
{
if（anInfo.getState（）== NetworkInfo .State.CONNECTED）
{
return true;
}
}
}
}
return false;
}
}
I have this scenario:
- Show a progress dialog.
- Call to Firebase.
- When the data is got Hide the progress dialog
Works perfectly, but the the problem comes when the device does not have an Internet connection, in this case the progress Dialog is always exhibited, what I would like to do when the device does not have Internet is close the Progress and show an error message.
This is my code:
showProgessDialog();
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("hello");
DatabaseReference connectedRef = FirebaseDatabase.getInstance().getReference(".info/connected");
connectedRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
boolean connected = snapshot.getValue(Boolean.class);
if (connected) {
Log.d(Constans.LOG,"1.- datachange connected");
hideProgressDialog();
} else {
Log.d(Constans.LOG,"2.- datachange disconnected");
showProgessDialog();
}
}
@Override
public void onCancelled(DatabaseError error) {
System.err.println("3.- datachange cancelled");
}
});
myRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.d(Constans.LOG,"4.- myRef addListenerForSingleValueEvent onDataChange");
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.d(Constans.LOG,"5.- myRef addListenerForSingleValueEvent cancell");
}
});
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.d(Constans.LOG,"6.- myRef addValueEventListener onDataChange");
String value = dataSnapshot.getValue(String.class);
mAboutMe.setText(value);
}
@Override
public void onCancelled(DatabaseError error) {
Log.d(Constans.LOG,"7.- myRef addValueEventListener error"+error.getDetails());
}
});
As you can see all the methods called have a number in the Log line, when the device has internet the methods calls order are :
2,1,6,4
When there is not internet is just called
2
I can not close the progress where I open it.
Any idea about what I can do it using the Firebase framework?
You can check internet connection of device by using isConnected method of this class. Then you dismiss progress dialog when there is not internet connection
public class InternetConnectionDetector
{
private Context context;
public InternetConnectionDetector(Context context)
{
this.context = context;
}
public boolean isConnected()
{
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
//There are changes after apk lollipop while detecting internet connection:
//if user's os newer then lollipop:
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
{
Network[] networks = connectivityManager.getAllNetworks();
NetworkInfo networkInfo;
for(Network mNetwork : networks)
{
networkInfo = connectivityManager.getNetworkInfo(mNetwork);
if(networkInfo.getState().equals(NetworkInfo.State.CONNECTED))
{
return true;
}
}
}
//if user's os older then lollipop:
else
{
//getAllNetworkInfo method work for only before API 19:
NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
if(info != null)
{
for(NetworkInfo anInfo : info)
{
if(anInfo.getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
}
return false;
}
}
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