An Android view for showing logs in realtime - useful for debugging

LogView.java

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.ScrollView;
import android.widget.TextView;

import java.util.Locale;

public class LogView extends ScrollView {
    private long mCreationTime = System.currentTimeMillis();
    
    private TextView mTextView;
    
    public LogView(Context context) {
        super(context);
        init();
    }
    
    public LogView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    
    public LogView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public LogView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init();
    }
    
    private void init() {
        mTextView = new TextView(getContext());
        addView(mTextView);
    }
    
    public void log(String message) {
        long elapsedTime  = System.currentTimeMillis() - mCreationTime;
        long seconds      = elapsedTime / 1000;
        long milliseconds = elapsedTime % 1000;
        
        if (mTextView.getText().length() > 0) {
            mTextView.append("\n");
        }
        
        String formattedLog = String.format(Locale.getDefault(), "T+%d.%03d: %s", seconds, milliseconds, message);
        mTextView.append(formattedLog);
    }
    
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
    
        smoothScrollTo(0, mTextView.getHeight());
    }
}