ProgressBar

 

import android.app.Activity;
import android.os.Bundle;
import android.widget.ProgressBar;
//使用Runnable接口
public class MainActivity extends Activity implements Runnable {
    private Thread th ;            //声明一条线程
    private ProgressBar pb ;     //声明一个进度条对象
    private boolean stateChage; //标识进度值最大最小的状态
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); 
        //实例进度条对象
        pb = (ProgressBar)findViewById(R.id.porb); 
        th = new Thread(this);//实例线程对象
        th.start();//启动线程
    }

    @Override
    public void run() {//实现Runnable接口抽象函数
        while(true){ 
            int current = pb.getProgress();//得到当前进度值
            int currentMax = pb.getMax();//得到进度条的最大进度值
            int secCurrent = pb.getSecondaryProgress();//得到底层当前进度值
            //以下代码实现进度值越来越大，越来越小的一个动态效果
            if(stateChage==false){ 
                if(current>=currentMax){ 
                    stateChage=true; 
                }else{
                    //设置进度值
                    pb.setProgress(current+1);
                    //设置底层进度值
                    pb.setSecondaryProgress(current+1);
                }
            }else{
                if(current<=0){ 
                    stateChage=false; 
                }else{
                    pb.setProgress(current-1);
                    pb.setSecondaryProgress(current-1);
                }
            }
            try {
                Thread.sleep(50);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

 

<?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="wrap_content"
        android:layout_height="wrap_content"
        android:text="默认进度条：" />

    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="progress1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="小圆形进度条：" />

    <ProgressBar
        style="?android:attr/progressBarStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="progress3" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:text="大圆形进度条：" />

    <ProgressBar
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="progress3" />

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="条形进度条：" />

    <ProgressBar
        android:id="@+id/porb"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50"
        android:secondaryProgress="70"
        android:text="progress2" />

</LinearLayout>