How to get Android crash logs?

If your app is being downloaded by other people and crashing on remote devices, you may want to look into an Android error reporting library (referenced in this SO post). If it's just on your own local device, you can use LogCat. Even if the device wasn't connected to a host machine when the crash occurred, connecting the device and issuing an adb logcat command will download the entire logcat history (at least to the extent that it is buffered which is usually a loooot of log data, it's just not infinite). Do either of those options answer your question? If not can you attempt to clarify what you're looking for a bit more?

The way to do this is to implement the Thread.UncaughtExceptionHandler interface and pass it to Thread.setDefaultUncaughtExceptionHandler() at the beginning of your Activity's onCreate(). Here is the implementation class TopExceptionHandler.

public class TopExceptionHandler implements Thread.UncaughtExceptionHandler {    private Thread.UncaughtExceptionHandler defaultUEH;    private Activity app = null;    public TopExceptionHandler(Activity app) {        this.defaultUEH = Thread.getDefaultUncaughtExceptionHandler();        this.app = app;    }    public void uncaughtException(Thread t, Throwable e) {        StackTraceElement[] arr = e.getStackTrace();        String report = e.toString()+"\n\n";        report += "--------- Stack trace ---------\n\n";        for (int i=0; i<arr.length; i++) {            report += "    "+arr[i].toString()+"\n";        }        report += "-------------------------------\n\n";        // If the exception was thrown in a background thread inside        // AsyncTask, then the actual exception can be found with getCause        report += "--------- Cause ---------\n\n";        Throwable cause = e.getCause();        if(cause != null) {            report += cause.toString() + "\n\n";            arr = cause.getStackTrace();            for (int i=0; i<arr.length; i++) {                report += "    "+arr[i].toString()+"\n";            }        }        report += "-------------------------------\n\n";        try {            FileOutputStream trace = app.openFileOutput("stack.trace",                                                         Context.MODE_PRIVATE);            trace.write(report.getBytes());            trace.close();        } catch(IOException ioe) {        // ...        }        defaultUEH.uncaughtException(t, e);    }}

Note We let the Android framework's defaultUEH to handle it.

At the top of your Activity register an instance of above class like this:

@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Thread.setDefaultUncaughtExceptionHandler(new TopExceptionHandler(this));...

This handler saves the trace in a file. When ReaderScope restarts next time, it detects the file and prompts the user if he/she wants to email it to the developer.

To Email the Stack Trace, execute following code to pack it in an email.

try {    BufferedReader reader = new BufferedReader(        new InputStreamReader(ReaderScopeActivity.this.openFileInput("stack.trace")));    while((line = reader.readLine()) != null) {        trace += line+"\n";    }} catch(FileNotFoundException fnfe) {    // ...} catch(IOException ioe) {    // ...}Intent sendIntent = new Intent(Intent.ACTION_SEND);String subject = "Error report";String body = "Mail this to appdeveloper@gmail.com: " + "\n" + trace + "\n";sendIntent.putExtra(Intent.EXTRA_EMAIL, new String[] {"readerscope@altcanvas.com"});sendIntent.putExtra(Intent.EXTRA_TEXT, body);sendIntent.putExtra(Intent.EXTRA_SUBJECT, subject);sendIntent.setType("message/rfc822");ReaderScopeActivity.this.startActivity(Intent.createChooser(sendIntent, "Title:"));ReaderScopeActivity.this.deleteFile("stack.trace");

Or you can also use ACRA Error Reporting System.Just Include the ACRA.jar in your project libs and use the below code snippet before your launcher activity class declaration

@ReportsCrashes(formKey = "", mailTo = "abc@gmail.com;def@yahoo.com", mode = ReportingInteractionMode.SILENT) 

or You can try this from console:-

adb logcat -b crash 

You can try this from the console:

adb logcat --buffer=crash 

More info on this option:

adb logcat --help...  -b <buffer>, --buffer=<buffer>         Request alternate ring buffer, 'main',                  'system', 'radio', 'events', 'crash', 'default' or 'all'.                  Multiple -b parameters or comma separated list of buffers are                  allowed. Buffers interleaved. Default -b main,system,crash.