You can use Google's ADB tool to get Logcat file to analyze the issue.

adb logcat > logcat.txt

open logcat.txt file and search for your application name. There should be information on why it failed, the line number ,Class name etc.

First you check which point your app has crashed (Unfortunately, MyApp has stopped.). For this you can use Log.e("TAG","Message");, using this line you can see you app log in logcat.

After that you find which point your app has stopped its very easy to solve at your side.

Just check the error in log cat.

You get the log cat option from in eclipse:

window->show view->others->Android->Logcat

Log cat contains error.

Other wise you can also check the error by executing an application in debug mode.
Firstly set breakpoint after that by doing:

right click on project->debug as->Android application

Note: This answer is using Android Studio 2.2.2

Note 2: I am considering that your device is successfully connected.

The first thing you do when your application crashes is look into the LogCat, at the bottom of Android Studio there's a toolbar with a list of menus:

Click on the "Android Monitor" (The one I underlined in the image above. ^)

Now, you'll get something like this:

Change "Verbose" to "Error" Now it will only show you logged errors. Don't worry about all these errors (if you got them) now.

Ok. Now, do what you did to crash your app. After your app crashes, go to your logcat. You should find a new crash log that has a lot of at:x.x.x: and Caused by: TrumpIsPresidentException for example. Go to that Caused by: statement in your logcat.

Next to that Caused By:, there should be the Exception that happened. In my case, it's a RuntimeException and under it there should be a line which contains a blue link such as:

If that Caused by: DOESN'T have a line with a blue text somewhere under it, then look for another Caused by: that does.

Click on that blue link. It should take you to where the problem occured. In my case, it was due to this line:

throw new RuntimeException();

So, now I know why it's crashing. It's because I'm throwing the exception myself. This was an obvious error.

However, let's say I got another error:

java.lang.NullPointerException

I checked my logcat, I clicked on the blue link it gave me, and it took me here:

mTextView.setText(myString);

So, now I want to debug. According to this StackOverflow question, a NullPointerException says that something is null.

So, let's find out what is null. There's two possibilities. Either mTextView is null, or myString is null. To find out, before the mTextView.setText(mString) line, I add these two lines:

Log.d("AppDebug","mTextView is null: " + String.valueOf(mTextView == null);

Log.d("AppDebug","myString is null: " + String.valueOf(myString== null);

Now, like we did previously (We changed Verose to Error), we want to change "Error" to "Debug". Since we're logging by debugging. Here's all the Log methods:

Log.

  d means Debug

  e means error

  w means warning

  v means verbose

  i means information

  wtf means "What a terrible failure". This is similar to Log.e

So, since we used Log.d, we're checking in Debug. That's why we changed it to debug.

Notice Log.d has a first parameter,in our case "AppDebug". Click on the "No Filters" drop down menu on the top-right of the logcat. Select "Edit Filter Configuration", give a name to your filter, and in "Log Tag" put "App Debug". Click "OK". Now, you should see two lines in the logcat:

yourPackageNameAndApp: mTextView is null: true

yourPackageNameAndApp: myString is null: false

So now we know that mTextView is null.

I observe my code, now I notice something.

I have private TextView mTextView declared at the top of my class. But, I'm not defining it.

Basically I forgot to do this in my onCreate():

mTextView = (TextView) findViewById(R.id.textview_id_in_xml);

So THAT'S why mTextView is null, because I forgot to tell my app what it is. So I add that line, run my app, and now the app doesn't crash.

This popup shows only when you get a fatal exception in your code which stops the execution of the app. It could be any exception NullPointerException, OutOfMemoryException etc.

Best way to check is through Logcat if you are still developing the app in Android studio which is quick way to read stack trace and check the cause of the app.

If your app is already live, then you can not use logcat. So, for that you can implement Crashlytics to provide you bug reports of any exception that occurs.

Check your Logcat message and see your Manifest file. There should be something missing like defining the Activity,User permission`, etc.

You can use any of these tools:

1. adb logcat




2. adb logcat > logs.txt (you can use editors to open and search errors.)




3. eclipse logcat (If not visible in eclipse, Go to Windows->Show View->Others->Android->LogCat)



4. Android Debug Monitor or Android Device Monitor(type command monitor or open through UI)

5. Android Studio

I suggest to use Android Debug Monitor, it is good. Because eclipse hangs when too many logs are there, and through adb logcat filter and all difficult.

You have to check the Stack trace

How to do that?

on Your IDE Check the windows form LOGCAT

If you cant see the logcat windows go to this path and open it

window->show view->others->Android->Logcat

if you are using Google-Api go to this path

adb logcat > logcat.txt

Let me share a basic Logcat analysis for when you meet a Force Close (when app stops working).

DOCS

Basic tool from Android to collect/analyse logs is the logcat.

HERE is the Android's page about logcat

If you use android Studio, you can also check this LINK.

Capturing

Basically, you can MANUALLY capture logcat with following command (or just check AndroidMonitor window in AndroidStudio):

adb logcat

There's a lot of parameters you can add to command which helps you to filter and display the message that you want... This is personal... I always use the command below to get the message timestamp:

adb logcat -v time

You can redirect the output to a file and analyze it in a Text Editor.

Analyzing

If you app is Crashing, you'll get something like:

07-09 08:29:13.474 21144-21144/com.example.khan.abc D/AndroidRuntime: Shutting down VM

07-09 08:29:13.475 21144-21144/com.example.khan.abc E/AndroidRuntime: FATAL EXCEPTION: main

    Process: com.example.khan.abc, PID: 21144

    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference

     at com.example.khan.abc.AudioFragment$1.onClick(AudioFragment.java:125)

     at android.view.View.performClick(View.java:4848)

     at android.view.View$PerformClick.run(View.java:20262)

     at android.os.Handler.handleCallback(Handler.java:815)

     at android.os.Handler.dispatchMessage(Handler.java:104)

     at android.os.Looper.loop(Looper.java:194)

     at android.app.ActivityThread.main(ActivityThread.java:5631)

     at java.lang.reflect.Method.invoke(Native Method)

     at java.lang.reflect.Method.invoke(Method.java:372)

     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)

     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

07-09 08:29:15.195 21144-21144/com.example.khan.abc I/Process: Sending signal. PID: 21144 SIG: 9

This part of the log shows you a lot of information:

• When the issue happened: 07-09 08:29:13.475
  

It is important to check when the issue happened... You may find several errors in a log... you must be sure that you are checking the proper messages :)

• Which app crashed: com.example.khan.abc
  

This way, you know which app crashed (to be sure that you are checking the logs about your message)

• Which ERROR: java.lang.NullPointerException
  

A NULL Pointer Exception error

• Detailed info about the error: Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference
  

You tried to call method onBackPressed() from a FragmentActivity object. However, that object was null when you did it.

• 
  

  Stack Trace: Stack Trace shows you the method invocation order... Sometimes, the error happens in the calling method (and not in the called method).

  
  
  

  at com.example.khan.abc.AudioFragment$1.onClick(AudioFragment.java:125)

  
  

Error happened in file com.example.khan.abc.AudioFragment.java, inside onClick() method at line: 125 (stacktrace shows the line that error happened)

It was called by:

at android.view.View.performClick(View.java:4848)

Which was called by:

at android.view.View$PerformClick.run(View.java:20262)

which was called by:

at android.os.Handler.handleCallback(Handler.java:815)

etc....

Overview

This was just an overview... Not all logs are simple etc... It is just to share the idea and provide a entry-level information to you...

I hope I could help you someway...
Regards

In below showToast() method you have to pass another parameter for context or application context by doing so you can try it.

  public void showToast(String error, Context applicationContext){

        LayoutInflater inflater = getLayoutInflater();

        View view = inflater.inflate(R.layout.custom_toast, (ViewGroup)      

        findViewById(R.id.toast_root));

        TextView text = (TextView) findViewById(R.id.toast_error);

        text.setText(error);

        Toast toast = new Toast(applicationContext);

        toast.setGravity(Gravity.TOP | Gravity.FILL_HORIZONTAL, 0, 0);

        toast.setDuration(Toast.LENGTH_SHORT);

        toast.setView(view);

        toast.show();

}

Use the LogCat and try to find what is causing the app to crash.

To see Logcat if you use Android Studio then Press ALT + 6
or

if you use Eclipse then
Window -> Open Perspective -> Other - LogCat

Go to the LogCat, from the drop down menu select error. This will contain all the required information to help you debug. If that doesn't help, post the LogCat as an edit to your question and somebody will help you out.

If your app for some reason crashes without good stacktrace. Try debug it from first line, and go line by line until crash. Then you will have answer, which line is causing you trouble. Proably you could then wrapp it into try catch block and print error output.

You can also get this error message on its own, without any stack trace or any further error message.

In this case you need to make sure your Android manifest is configured correctly (including any manifest merging happening from a library and any activity that would come from a library), and pay particular attention to the first activity displayed in your application in your manifest files.

Crash during development

Try logview-0.20 to get the logs and analyze them during development.

Make sure to mark ./logview and ./lib/logview.jar as executable when running in Linux.

If you don't like it, there're a lot of alternative desktop log viewers for Android.

Crash in the wild

Integrate a real-time crash reporting tool such as Firebase Crashlytics in order to get stacktraces of unhandled exceptions which occurred on users' devices.

Read How to Release a Buggy App (And Live to Tell the Tale) to know more about handling bugs in the field.

People make mistakes, and so coding as well.

When ever any error happened, always check with the logcat with the text in red color however u can find out the real problem in blue color text with underline in those red color text.

Make sure if u create a new activity, always declare the activity in the AndroidManifest file.

If adding Permission, declare it in the AndroidMainifest file as well.