How to insert a log in LogCat that when I click on it jumps to its line in code?

I found it:

public static void showLogCat(String tag, String msg) {

        StackTraceElement[] stackTraceElement = Thread.currentThread()
                .getStackTrace();
        int currentIndex = -1;
        for (int i = 0; i < stackTraceElement.length; i++) {
            if (stackTraceElement[i].getMethodName().compareTo("showLogCat") == 0)
            {
                currentIndex = i + 1;
                break;
            }
        }

        String fullClassName = stackTraceElement[currentIndex].getClassName();
        String className = fullClassName.substring(fullClassName
                .lastIndexOf(".") + 1);
        String methodName = stackTraceElement[currentIndex].getMethodName();
        String lineNumber = String
                .valueOf(stackTraceElement[currentIndex].getLineNumber());

        Log.i(tag, msg);
        Log.i(tag + " position", "at " + fullClassName + "." + methodName + "("
                + className + ".java:" + lineNumber + ")");

    }

Its usage:

showLogCat("tag", "message");

The important thing is to insert "(X:Y)" in your log message, while X is your desired file name and Y is your desired line number in X. (I learned it from @breceivemail's answer). So try:

public static void log(final String tag, final String msg) {
    final StackTraceElement stackTrace = new Exception().getStackTrace()[1];

    String fileName = stackTrace.getFileName();
    if (fileName == null) fileName="";  // It is necessary if you want to use proguard obfuscation.

    final String info = stackTrace.getMethodName() + " (" + fileName + ":"
            + stackTrace.getLineNumber() + ")";

    Log.LEVEL(tag, info + ": " + msg);
}

Note: The LEVEL is the log level and can be v, d, i, w, e or wtf.

Now you can use log(tag, msg) instead of Log.LEVEL(tag, msg).

---

Example:

MainActivity.java:

...
public class MainActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        log("Test Tag", "Hello World!");

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ...
    ...

The output:

12-30 14:24:45.343 ? I/Test Tag: onCreate (MainActivity.java:10): Hello World!

And MainActivity.java:10 automatically would be a link and you can click on it!

---

You can also assign following value to info variable if you want more verbose log:

final String info = stackTrace.getClassName() + "." + stackTrace.getMethodName() + " ("
            + fileName + ":" + stackTrace.getLineNumber() + ")\n";

So the output of above example would be:

12-30 14:33:07.360 ? I/Test Tag: com.example.myapp.MainActivity.onCreate (MainActivity.java:11)
                                 Hello World!    

Please use this Tree with Timber.

class MyLinkingTimberTree : Timber.DebugTree() {
    override fun createStackElementTag(element: StackTraceElement): String? {
        return makeClickableLineNumber(element)
    }

    private fun makeClickableLineNumber(
        element: StackTraceElement
    ): String {
        val className = element.fileName
        val methodName = element.methodName
        val lineNumber = element.lineNumber
        val fileName = element.fileName
        val stringBuilder = StringBuilder(className)
        .append(".")
        .append(methodName)
        .append(" (")
        .append(fileName)
        .append(":")
        .append(lineNumber)
        .append(")  ")
        return stringBuilder.toString()
    }
}

And then just instantiate it like this:

class MyApplication: Application() {

    override fun onCreate() {
        super.onCreate()
        if(BuildConfig.DEBUG) {
            Timber.plant(MyLinkingTimberTree())
        }
    }
}

Then just use Timber normally:

Timber.d("Currently Signed in:")

And this is the result. Nice, isn't it? I hope you enjoy using it as much as I enjoyed making it! ;)