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
    }
}