ProgressBar

下面介绍两种进度条分别是圆形进度条和长形进度条的代表：

下面两张图：

图1.UC浏览网页圆形进度条效果。

图2.Google Market应用下载长形进度条效果.

下面我们看一下两都皆有之的Android自带的浏览器的效果图如下:

第一步：新建一个Android工程命名为ProgressBarDemo.

第二步:修改main.xml代码如下(圆形进度条和长形进度条这里样式不同用系统自带的):

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<ProgressBar
android:id="@+id/rectangleProgressBar"
style="?android:attr/progressBarStyleHorizontal" lp_style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone"
/>
<ProgressBar
android:id="@+id/circleProgressBar"
style="?android:attr/progressBarStyleLarge" lp_style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
/>

<Button android:id="@+id/button"
android:text="Show ProgressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

<Button android:id="@+id/button"
android:text="Show ProgressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

第三步:修改ProgressBarDemo.java代码如下:

package com.lp.ecjtu;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class ProgressBarDemoActivity extends Activity {
/** Called when the activity is first created. */
private ProgressBar rectangleProgressBar,circleProgressBar;
private Button mButton;
protected static final int STOP = 0x10000;
protected static final int NEXT = 0x10001;
private int iCount = 0;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
rectangleProgressBar = (ProgressBar) findViewById(R.id.rectangleProgressBar);
circleProgressBar = (ProgressBar) findViewById(R.id.circleProgressBar);
mButton = (Button) findViewById(R.id.button);
rectangleProgressBar.setIndeterminate(false);//设置不确定模式下
circleProgressBar.setIndeterminate(false);
mButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
rectangleProgressBar.setVisibility(View.VISIBLE);
circleProgressBar.setVisibility(View.VISIBLE);
rectangleProgressBar.setMax(100);
rectangleProgressBar.setProgress(0);
circleProgressBar.setProgress(0);
//创建一个此线程，每秒步长为5，到100%时停止
Thread mThread = new Thread(new Runnable() {

@Override
public void run() {
//循环
for(int i=0;i<10;i++){
try {
iCount = (i+1)*10;//步长为10进行增加，直到100
Thread.sleep(1000);//1秒
//当i=9的时候进度为100，停止
if(i==9){
Message msg = new Message();
msg.what=STOP;
mHandler.sendMessage(msg);
break;
}else{
Message msg = new Message();
msg.what=NEXT;
mHandler.sendMessage(msg);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//

}
}
});
mThread.start();
}
});
}
//定义一个Handler
private Handler mHandler = new Handler(){

@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case STOP:
rectangleProgressBar.setVisibility(View.GONE);
circleProgressBar.setVisibility(View.GONE);
Thread.currentThread().interrupt();//中断线程
break;
case NEXT:
if(!Thread.currentThread().isInterrupted()){//不中断
rectangleProgressBar.setProgress(iCount);//设置进度条的状态
circleProgressBar.setProgress(iCount);
}
break;
}
}

};
}

效果图：

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