ProgressDialog进度条对话框

(一）

1.效果图：

2.activity_main.xml

 <?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>

3.MainActivity.java

 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;
     }
 }