josejuansanchez

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

josejuansanchez

package com.example.testSingleton;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;

public class ActivityA extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {

josejuansanchez

<manifest ...>
    ...
    <!-- Make sure your app (or individual activity) uses the
         theme with the custom attribute defined. -->
    <application android:theme="@style/AppTheme" ...>
        ...
    </application>
</manifest>