Android 利用TimerTask实现ImageView图片播放效果

在项目开发中，往往 要用到图片播放的效果。今天就用TimerTask和ImageView是实现简单的图片播放效果。

当中，TimerTask和Timer结合一起使用。主要是利用TimerTask的迭代延时等时间段处理事件的机制。

详细实比例如以下：

1.layout xml代码

<span style="font-family:Microsoft YaHei;font-size:18px;"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical" >

<!-- 開始播放 -->
<Button
android:id="@+id/my_start_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Start" />

<!-- 停止播放 -->
<Button
android:id="@+id/my_stop_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Stop" />

<!-- 又一次開始播放 -->
<Button
android:id="@+id/my_restart_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Restart" />

<ImageView
android:id="@+id/image_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/onea" />

</LinearLayout></span>

<span style="font-family:Microsoft YaHei;font-size:18px;">package com.example.myimageplaydemo;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements OnClickListener {

private Button startBtn, stopBtn,restartBtn;
private ImageView imageIv;
private Timer timer;
private TimerTask timerTask;
private int count = 0;

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
int myCount = Integer.valueOf(msg.obj.toString());

switch (msg.what) {
case 1:
setImageViewSrc(myCount);
break;
case 2:
stopTimer();
break;
case 3:
setImageViewSrc(myCount);
break;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@Override
public void onStart() {
super.onStart();

startBtn = (Button) this.findViewById(R.id.my_start_btn);
stopBtn = (Button) this.findViewById(R.id.my_stop_btn);
restartBtn = (Button) this.findViewById(R.id.my_restart_btn);
imageIv = (ImageView) this.findViewById(R.id.image_iv);

startBtn.setOnClickListener(this);
stopBtn.setOnClickListener(this);
restartBtn.setOnClickListener(this);
}

@Override
public void onStop() {
super.onStop();
stopTimer();
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.my_start_btn:
if (timerTask == null) {
timer = new Timer();
//延迟一秒，迭代一秒设置图片
timerTask = new TimerTask() {

@Override
public void run() {
++count;
handler.sendMessage(handler.obtainMessage(1, count));
}
};
timer.schedule(timerTask, 1000, 1000);
} else {
handler.sendMessage(handler.obtainMessage(1, count));
}
break;
case R.id.my_stop_btn:
handler.sendMessage(handler.obtainMessage(2, count));
break;
case R.id.my_restart_btn:
if (timerTask == null) {
count = 0 ;
timer = new Timer();
timerTask = new TimerTask() {

@Override
public void run() {
count++;
handler.sendMessage(handler.obtainMessage(3, count));
}
};
timer.schedule(timerTask, 1000, 1000);
} else {
handler.sendMessage(handler.obtainMessage(3, 0));
}
}
}

/**
* 依据count循环对ImageView设置图片
* @param count
*/
private void setImageViewSrc(int count) {
int myCount = count % 7;
switch (myCount) {
case 0:
imageIv.setImageResource(R.drawable.onea);
break;
case 1:
imageIv.setImageResource(R.drawable.oneb);
break;
case 2:
imageIv.setImageResource(R.drawable.onec);
break;
case 3:
imageIv.setImageResource(R.drawable.oned);
break;
case 4:
imageIv.setImageResource(R.drawable.onee);
break;
case 5:
imageIv.setImageResource(R.drawable.onef);
break;
case 6:
imageIv.setImageResource(R.drawable.oneg);
break;
}
}

/**
* 销毁TimerTask和Timer
*/
private void stopTimer(){
if (timerTask != null) {
timerTask.cancel();
timerTask = null;
}

if(timer != null){
timer.cancel();
timer = null;
}
}

}
</span>

<span style="font-family:Microsoft YaHei;font-size:18px;"><span style="white-space:pre">			</span>if (timerTask == null) {
timer = new Timer();
//延迟一秒。迭代一秒设置图片
timerTask = new TimerTask() {

@Override
public void run() {
++count;
handler.sendMessage(handler.obtainMessage(1, count));
}
};
timer.schedule(timerTask, 1000, 1000);
} else {
handler.sendMessage(handler.obtainMessage(1, count));
}</span>

源代码地址：http://download.csdn.net/detail/a123demi/7736643