Simple Mathod Profiling util forked from Android's TimingLogger

ProfilingUtil.java

/**
 * Created by sergey on 1/29/18.
 */


import android.os.SystemClock;
import java.util.ArrayList;

public class ProfilingUtil {
    private static final String PROFILING = "PROFILING";
    private static ProfilingUtil sInstance;
    private String mLabel;
    private ArrayList<Long> mSplits;
    private ArrayList<String> mSplitLabels;

    private ProfilingUtil() {
        reset("init");
    }

    public static void start(String label) {
        getInstance().reset(label);
    }

    public static void split(String splitLabel) {
        getInstance().addSplit(splitLabel);
    }

    public static void dump() {
        getInstance().dumpToLog();
    }

    private static ProfilingUtil getInstance() {
        if (sInstance == null) {
            sInstance = new ProfilingUtil();
        }
        return sInstance;
    }

    private void reset(String label) {
        mLabel = label;
        reset();
    }

    private void reset() {
        if (mSplits == null) {
            mSplits = new ArrayList<>();
            mSplitLabels = new ArrayList<>();
        } else {
            mSplits.clear();
            mSplitLabels.clear();
        }
        addSplit(null);
    }

    private void addSplit(String splitLabel) {
        long now = SystemClock.elapsedRealtime();
        mSplits.add(now);
        mSplitLabels.add(splitLabel);
    }

    private void dumpToLog() {
        Log.d(PROFILING, " ");
        Log.d(PROFILING, " ");
        Log.d(PROFILING, "=======================================");
        Log.d(PROFILING, mLabel + ": begin");
        final long first = mSplits.get(0);
        long now = first;
        for (int i = 1; i < mSplits.size(); i++) {
            now = mSplits.get(i);
            final String splitLabel = mSplitLabels.get(i);
            final long prev = mSplits.get(i - 1);
            Log.d(PROFILING, mLabel + ":      " + (now - prev) + " ms, " + splitLabel);
        }
        Log.d(PROFILING, mLabel + ": end, " + (now - first) + " ms");
        Log.d(PROFILING, "=======================================");
        Log.d(PROFILING, " ");
        Log.d(PROFILING, " ");
    }
}

USAGE

ProfilingUtil.start("method name");
 // code here...
ProfilingUtil.split("label 1");
// code here...
ProfilingUtil.split("label 2");
// code here...
ProfilingUtil.dump(); // prints the result