Use Handler, Timer + Timertask to implement simple image carousel,

Use Handler, Timer + Timertask to implement simple image carousel,

The layout file is only placed in a simple ImageView and will not be displayed.

Below is the Activity

1 package com. example. administrator. handlerthreadmessagedemo; 2 3 import android. app. activity; 4 import android. OS. bundle; 5 import android. OS. handler; 6 import android. OS. message; 7 import android. widget. imageView; 8 import android. widget. textView; 9 import java. util. timer; 10 11 12 public class MainActivity extends Activity {13 14 private int images [] = new int [] {R. drawable. image1, R. drawable. image2, R. drawable. image3}; // 15 16 private ImageView imageView; 17 private int index = 0; // calculate 18 private TextView textView; 19 private Timer timer = new Timer (); 20 private Timertask timertask; 21 22 23 24 @ Override25 protected void onCreate (Bundle savedInstanceState) {26 27 super. onCreate (savedInstanceState); 28 setContentView (R. layout. activity_main); 29 imageView = (ImageView) findViewById (R. id. imageView); 30 textView = (TextView) findViewById (R. id. title); 31 timertask = new Timertask (); // put it back to 32 Timer in timer. schedule (timertask,); // use Timer to send an empty message every one second 33} 34 35 private Handler mhandler = new Handler () {36 @ Override37 public void handleMessage (Message msg) {38 super. handleMessage (msg); 39 if (msg. what = 0x111) {40 index ++; 41 imageView. setBackgroundResource (images [index % 3]); 42} 43} 44}; 45 46 class Timertask extends java. util. timerTask {47 48 @ Override49 public void run () {50 mhandler. sendEmptyMessage (0x111); 51} 52} 53 54}