<?xml version="1.0" encoding="utf-8"?>

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:paddingBottom="@dimen/activity_vertical_margin"

     android:paddingLeft="@dimen/activity_horizontal_margin"

     android:paddingRight="@dimen/activity_horizontal_margin"

     android:paddingTop="@dimen/activity_vertical_margin"

     tools:context="com.example.administrator.hello3.MainActivity">

     <Button

         android:id="@+id/btn"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:text="显示进度条" />

 </RelativeLayout>

 package com.example.administrator.hello3;

 import android.app.Activity;

 import android.app.ProgressDialog;

 import android.os.Handler;

 import android.os.Message;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.view.View;

 import android.widget.Button;

 public class MainActivity extends Activity {

     private Button button;

     private ProgressDialog pd;

     private final static  int MAXVALUE=100;

     private int progressStatus =0; //进度条对话框的百分比情况

     private int data[] = new int[100];//填充数组

     private  int current = 0;

     private Handler handler = new Handler(){

         @Override

         public void handleMessage(Message msg) {

             if(msg.what==0x123){

                 pd.setProgress(progressStatus);

             }

             super.handleMessage(msg);

         }

     };

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         button=(Button)findViewById(R.id.btn);

         button.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 progressStatus=0;

                 current=0;

                 pd=new ProgressDialog(MainActivity.this);

                 pd.setMax(MAXVALUE);

                 pd.setTitle("任务完成百分比");

                 pd.setMessage("耗时任务完成百分比");

                 pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

                 pd.show();

                 new Thread(new Runnable() {

                     @Override

                     public void run() {

                         while (progressStatus<MAXVALUE){

                             progressStatus=MAXVALUE*dowork()/data.length;

                             handler.sendEmptyMessage(0x123);

                         }

                         if(progressStatus>=MAXVALUE){

                             pd.dismiss();

                         }

                     }

                 }).start();

             }

         });

     }

     public  int dowork(){

         data[current++]=(int)(Math.random()*100);

         try {

             Thread.sleep(100);

         }catch (InterruptedException e){

             e.printStackTrace();

         }

         return current;

     }

 }