Database Develop

[Q] Android Studio app says "Error In Network Connection"

I have created a login and register system, when ever I try to login, register, change password or reset password the app just says "Error In Network Connection".
I am using strong internet connection, could you please advise as I have tried to on WI-FI and 4G, however it still says the same error. I am using WAMP server to connect to myphpadmin database. Please could you help and advise. I have used the internet method as well as using the doinbackground method.

Emulator , Use Device
If you use emulator. You will get this type of problem.
Use below code to check the online condition for mobile.
public boolean isNetworkOnline() {
boolean status=false;
try{
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getNetworkInfo(0);
if (netInfo != null && netInfo.getState()==NetworkInfo.State.CONNECTED) {
status= true;
}else {
netInfo = cm.getNetworkInfo(1);
if(netInfo!=null && netInfo.getState()==NetworkInfo.State.CONNECTED)
status= true;
}
}catch(Exception e){
e.printStackTrace();
return false;
}
return status;
}

Fatal Error, null object. How to debug?

I have inported an Eclipse app into Studio. When I run the app I get the fatal error:
Attempt to invoke virtual method 'void android.nfc.NfcAdapter.enableForegroundDispatch(android.app.Activity, android.app.PendingIntent, android.content.IntentFilter[ ], java.lang.String[ ][ ])' on a null object reference
As far as I can tell the error is caused by the mAdapter.enableForegroundDispatch method below, because one ore more of it's parameters is null. I put a breakpoint there and run the debugger in the emulator. It never hits the breakpoint. I also set the debugger to break on any exception and it doesn't. the App starts and I get the "unfortunately the app has stopped" message.
@override
protected void onResume()
{
// TODO Auto-generated method stub
super.onResume();
//Used for DEBUG : Log.v("NFCappsActivity.java", "ON RESUME NFC APPS ACTIVITY");
mPendingIntent = PendingIntent.getActivity(this, 0,new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists);
}
Thanks for the help.
Rich

Android Studios, Update on time

Hey, I'm fairly new to using android studios and I am trying to make an app that updates its display every few seconds.
The method I am currently using is to update when a button is pressed using the following:
public void Refreshing(View view) {
// do stuff here...
}
Where Refreshing is the onClick of a button I placed.
How can I use a similar format but instead of doing things on a button press just have it done automatically after a few seconds?

You can use a android.os.Handler for that. It allows you to interact with the event loop and post a Runnable that will be executed after a given delay
In your Activity's onCreate() method:
Code:
final int delayMs = 1000;
final Handler handler = new Handler(this);
final Runnable runnable = new Runnable() {
@Override public void run() {
// Call your refresh method
Refreshing();
// Restart the timer
handler.postDelayed(runnable, delayMs);
};
}
handler.postDelayed(runnable, delayMs);

Thanks, this is exactly what I'm looking for. I add the code to the onCreate but I had an semicolon error. So I added another semicolon but its having trouble with a few other parts. Here is what I have.
Code:
final int delayMs = 1000;
final Handler handler = new Handler([B]this[/B]);
final Runnable runnable = new Runnable() {
@Override public void run() {
// Call your refresh method
Refreshing();
// Restart the timer
handler.postDelayed([B]runnable[/B], delayMs);
};
};
handler.postDelayed(runnable, delayMs);
The error listed is:
Error : (134, 33) error: no suitable constructor found for Handler(MainActivity)
constructor Handler.Handler(Looper,Callback) is not applicable
(actual and formal argument lists differ in length)
constructor Handler.Handler(Looper) is not applicable
(actual argument MainActivity cannot be converted to Looper by method invocation conversion)
constructor Handler.Handler(Callback) is not applicable
(actual argument MainActivity cannot be converted to Callback by method invocation conversion)
constructor Handler.Handler() is not applicable
(actual and formal argument lists differ in length)
The words I bolded are underlined in red in Android Studios.
this ----------------has a constructor error
runnable ----------has a initialization error
I tried troubleshooting for a little bit and took out the this and the only error left is with runnable. It says: Error: (141, 37) error: variable runnable might not have been initialized

Yep, I wrote the code without testing it. It might need some adaptation.
Here is a version that should work:
Code:
final int delayMs = 1000;
final Handler handler = new Handler([B]this[/B]);
final Runnable runnable = new Runnable() {
@Override public void run() {
// Call your refresh method
Refreshing();
// Restart the timer
handler.postDelayed([B]this[/B], delayMs);
};
};
handler.postDelayed([B]runnable[/B], delayMs);

Thank you so much, it worked. I just had to change
Code:
final Handler handler = new Handler(this);
to
Code:
final Handler handler = new Handler();

PowerManger permission denied with Magisk and SuperSU

First of all, we need to reboot the device by button click.
Device: Mediatek MT6737M Android 6.0 running Marshmallow
I currently have three devices. One rooted with Magisk another SuperSU the third with Kingroot. In the settings on all three root managers I have it set to grant all permissions. When we try and restart Kingroot flashes a prompt to allow permission which we can work around but Kingroot is riddled with garbage that we don't want. We want to use Magisk or SuperSU because they are clean with less baggage. Magisk and SuperSU however throw an error: java.io.IOException:
Code:
Error running exec(). Command: [/system/bin/su, -c, reboot now] Working Directory: null Environment: null.
This is the code we're using to access PowerManager:
Code:
void reboot() {
if (reboot) {
try {
Process proc = Runtime.getRuntime().exec(new String[]{"/system/bin/su", "-c", "reboot"});
proc.waitFor();
} catch (Exception ex) {
Log.e(TAG, "Error ", ex);
}
}
}
Is there a way to grant permission to this process using either Magisk or SuperSU? If not is there another rooting management tool or software that is clean and malware free that can achieve that?
NOTE: Code by senior developer I am a Baby, Jr dev here tasked with finding the answer. Please be patient if I ask dumb questions.

Ok so first thing I'll start by saying that you should be making su calls in a background thread. The su call is a blocking call so it will block the UI thread which can cause ANRs (crashes) and overall bad user experience. AsyncTask is perfect for su calls to run in the background instead.
You should also stick with Magisk as it is actively being developed and is the current standard.
Let's get started. Create a new class and call it RootShell.java. Then copy the following code into it.
Java:
class RootShell {
private static void exec(String[] cmd) {
new Execute().execute(cmd);
}
private static class Execute extends AsyncTask<String, Void, Void> {
Override
protected Void doInBackground(String... cmds) {
try {
Process process = Runtime.getRuntime().exec("su");
DataOutputStream os = new DataOutputStream(process.getOutputStream());
for (String tmpCmd : cmds) {
os.writeBytes(tmpCmd + "\n");
}
os.writeBytes("exit\n");
os.flush();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
}
Keep in mind that XDA has awful code formatting so the Override should have the @ symbol in front of it.
Now you can pass single or multiple root commands to this class which will be executed in a background thread. Here's how...
Lets say you're using a button in another class to reboot the phone. This is what it would look like...
Java:
private void rebootButton(View view) {
String[] cmd = { "reboot" };
RootShell.exec(cmd);
}
To pass multiple commands your button would look like this.
This is to reboot into safe mode...
Java:
private void rebootSafeMode(View view) {
String[] cmd = {
"setprop persist.sys.safemode 1",
"setprop ctl.restart zygote"
};
RootShell.exec(cmd);
}
For more info on how to properly su you should check out the following link...
https://su.chainfire.eu/
Hope this helps you with your app and good luck.

Hook not called for android.app.ActivityManagerProxy.clearApplicationU serData

Square Enix's Final Fantasy 3 is known to crash when any xposed modules are enabled.
I would like to work around the problem by preventing the failing method to be called at all.
When starting FF3, it crashes with:
Code:
E/AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: main
java.lang.SecurityException: 1317 does not have permission:android.permission.CLEAR_APP_USER_DATA to clear datafor process:org.example.xposed.module
at android.os.Parcel.readException(Parcel.java:1425)
at android.os.Parcel.readException(Parcel.java:1379)
at android.app.ActivityManagerProxy.clearApplicationUserData(ActivityManagerNative.java:2889)
at com.android.commands.pm.Pm.runClear(Pm.java:1126)
at com.android.commands.pm.Pm.run(Pm.java:116)
at com.android.commands.pm.Pm.main(Pm.java:75)
at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:235)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:135)
at dalvik.system.NativeStart.main(Native Method)
Now I would like to make "android.app.ActivityManagerProxy.clearApplicationUserData" simply return true if the package name is one of the xposed modules that are running here.
I tried that with:
Code:
@Override
public void initZygote(StartupParam startupParam) throws Throwable
{
XposedHelpers.findAndHookMethod(
"android.app.ActivityManagerProxy", null, "clearApplicationUserData",
String.class, "android.content.pm.IPackageDataObserver", int.class,
new XC_MethodHook() {
@Override
protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
XposedBridge.log("clearApplicationUserData");
param.setResult(true);
}
}
);
}
Unfortunately, the method is never called (I do not see the log message), and the crash still occurs.
I tried it both in initZygote and handleLoadPackage.
I'm running on Android 4.1.2 with xposed v50 (bridge v47).
Am I missing something? Does "android.app.ActivityManagerProxy" need some special handling/registration?

Hooking into command line tools needs IXposedHookCmdInit which is not supported anymore:
https://forum.xda-developers.com/xposed/hook-cmds-pm-t2955122
https://forum.xda-developers.com/xposed/xposed-api-changelog-developer-news-t2714067#4

@rovo89 wrote
Only two modules used it, both got rid of it without any loss of functionality.
Click to expand...
Click to collapse
This here is an exception: The command init hook is needed, because ActivityManagerProxy.clearApplicationUserData() already does security checks before it hands the command off to PackageManagerService.clearApplicationUserData.
So I had to go the hard way and find an old XposedBridgeApi-52.jar that let me compile an xposed module with IXposedHookCmdInit and initCmdApp inside it, just to hook into the clearApplicationUserData used by the "pm" cli tool.
It actually worked and I can now run "pm clear mypackage" from every user and always get a "success" message.
Unfortunately, Final Fantasy 3 still exits:
I/Xposed: clearApplicationUserData: de.cweiske.ouya.plainpurchases
D/AndroidRuntime: Shutting down VM
I/AndroidRuntime: NOTE: attach of thread 'Binder_3' failed
D/dalvikvm: JIT code cache reset in 0 ms (86452 bytes 1/0)
D/dalvikvm: Debugger has detached; object registry had 1 entries
D/Zygote: Process 1572 exited cleanly (1)
I/ActivityManager: Process com.square_enix.android_OUYA.FFIII (pid 1572) has died.
W/ActivityManager: Force removing ActivityRecord{420f33f0 com.square_enix.android_OUYA.FFIII/com.square_enix.FFIII_J.MainActivity}: app died, no saved state
I am beginning to think that the lib is Square Enix' xposed protection, and that the forced crash was only a red herring so that I could waste time
Blog post: http://cweiske.de/tagebuch/square-enix-securityexception.htm