Android入门之ProgressBar（纯java）

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;

public class ProgressBarTest extends Activity {

private LinearLayout mainLayout;//界面主容器
private TextView tv1;			//文本1
private ProgressBar bar1;		//圆形进度条
private TextView tv2;			//文本2
private ProgressBar bar2;		//水平条状进度条，确定进度
private TextView tv3;			//文本3
private ProgressBar bar3;		//水平条状进图条，不确定进度

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

/*mainLayout主容器初始化*/
mainLayout=new LinearLayout(this);
mainLayout.setOrientation(LinearLayout.VERTICAL);	//垂直分布

/*tv1文本1初始化*/
tv1=new TextView(this);
tv1.setText("圆形进度条");
mainLayout.addView(tv1);//添加文本1

/*bar1圆形进度条初始化*/
bar1=new ProgressBar(this,null,android.R.attr.progressBarStyleLarge);//大圆
//bar1=new ProgressBar(this,null,android.R.attr.progressBarStyleSmall);//小圆
//bar1=new ProgressBar(this,null,android.R.attr.progressBarStyleSmallTitle);//小圆，标题条的样式
/*
* 下面可以通过改变LayoutParams中的width参数来设置圆形进度条的直径
* height如果小于width，下圆环会被截掉，无法显示全圆
*/
LinearLayout.LayoutParams lp1=new LinearLayout.LayoutParams(-2,-2);
bar1.setLayoutParams(lp1);
mainLayout.addView(bar1);//添加进度条1

/*tv2文本2初始化*/
tv2=new TextView(this);
tv2.setText("水平进度条");
mainLayout.addView(tv2);//添加文本2

/*bar2条形进度条初始化*/
bar2=new ProgressBar(this,null,android.R.attr.progressBarStyleHorizontal);//水平条形
LinearLayout.LayoutParams lp2=new LinearLayout.LayoutParams(200, -2);//长度200，高度默认
bar2.setLayoutParams(lp2);
bar2.setMax(100);
bar2.setProgress(50);
bar2.setSecondaryProgress(75);
mainLayout.addView(bar2);//添加进度条2

/*tv3文本3初始化*/
tv3=new TextView(this);
tv3.setText("不确定进度的水平进度条");
mainLayout.addView(tv3);//添加文本3

/*bar3条形进度条初始化*/
bar3=new ProgressBar(this,null,android.R.attr.progressBarStyleHorizontal);
LinearLayout.LayoutParams lp3=new LinearLayout.LayoutParams(300,20);//长度为300，高度20
bar3.setLayoutParams(lp3);
/*
* 设定进度条为不确定进度,默认是可确定进度的进度条，进度初值为0
* 圆形进度条固定为不确定进度的
*/
bar3.setIndeterminate(true);
mainLayout.addView(bar3);//添加进度条3

setContentView(mainLayout);//显示主容器
}
}