Android入门之ProgressDialog（纯Java）

1、ProgressDialog.STYLE_SPINNER为圆形不确定进度条

2、ProgressDialog.STYLE_HORIZONTAL为条形进图条，当设置为可确定进度的进度条时，在调用show()函数之前设置进度无效，百分比始终为0。第二进度可设置，但是在show()之前设置没什么意义。不管是静态显示抑或是动态显示，都要在show()函数调用之后再操作。

import Android.app.Activity;   import android.app.ProgressDialog;   import android.os.Bundle;   import android.view.View;   import android.view.View.OnClickListener;   import android.widget.*;      public class ProgressDialogTest extends Activity {          private RelativeLayout mainView=null;       private Button button1=null;       private Button button2=null;       private ProgressDialog pd1=null;       private ProgressDialog pd2=null;              public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           mainView=new RelativeLayout(this);           button1=new Button(this);           RelativeLayout.LayoutParams lp1=new RelativeLayout.LayoutParams(-2,-2);           lp1.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);           lp1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);           button1.setLayoutParams(lp1);           button1.setText("圆形进度条");           button1.setOnClickListener(new OnClickListener(){               public void onClick(View v) {                   if(pd1==null){                       pd1_init();                   }                   pd1.show();               }           });           mainView.addView(button1);           button2=new Button(this);           RelativeLayout.LayoutParams lp2=new RelativeLayout.LayoutParams(-2,-2);           lp2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);           lp2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);           button2.setLayoutParams(lp2);           button2.setText("条形进度条");           button2.setOnClickListener(new OnClickListener(){               public void onClick(View v) {                   if(pd2==null){                       pd2_init();                   }                   pd2.show();                   pd2.setProgress(50);                   /*一种动态加载效果                  new Thread() {                         int progress=0;                       public void run() {                             try {                                 while (progress <= 100) {                                     // 由线程来控制进度                                     pd2.setProgress(progress++);                                     Thread.sleep(100);                                 }                                 pd2.cancel();                             } catch (Exception e) {                                 pd2.cancel();                             }                         }                     }.start();                     */               }           });           mainView.addView(button2);           setContentView(mainView);       }       /*pd1初始化*/       void pd1_init(){           pd1=new ProgressDialog(this);           pd1.setIcon(android.R.drawable.ic_menu_info_details);           pd1.setTitle("正在联网");           pd1.setProgressStyle(ProgressDialog.STYLE_SPINNER);           pd1.setMessage("请稍后……");       }       /*pd2初始化*/       void pd2_init(){           pd2=new ProgressDialog(this);           pd2.setIcon(android.R.drawable.sym_def_app_icon);           pd2.setTitle("正在下载软件");           pd2.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);           pd2.setIndeterminate(false);           pd2.setMessage("测试");           pd2.setMax(100);           //pd2.setProgress(50);   在show()之前设置该值无效，show()之前固定进度为0            //pd2.setSecondaryProgress(75);//在show()之前有效，但是意义不大        }   }