1.模拟文件拷贝:

要求：要用progressDialog和子线程来模拟显示拷贝进度；进度完成后在主界面提示拷贝完成，分别使用普通方式和消息机制编写。

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.hanqi.testapp2.MoniwenjianActivity"
11     android:orientation="vertical">
12
13     <Button
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:text="点击拷贝"
17         android:onClick="mn1_OnClick"/>
18
19     <TextView
20         android:layout_width="match_parent"
21         android:layout_height="wrap_content"
22         android:text="运行结果"
23         android:id="@+id/tt_1"/>
24
25 </LinearLayout>

 1 package com.hanqi.testapp2;
 2
 3 import android.app.ProgressDialog;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.TextView;
 8
 9 public class MoniwenjianActivity extends AppCompatActivity {
10
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.activity_moniwenjian);
15     }
16
17     public void mn1_OnClick(View v)
18     {
19         final ProgressDialog progressDialog=new ProgressDialog(this);
20
21         progressDialog.setTitle("拷贝进度框");
22         progressDialog.setMessage("正在拷贝...");
23         progressDialog.setCancelable(false);
24
25         //设置成水平
26         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
27
28         progressDialog.show();
29
30         final TextView tt_1=(TextView)findViewById(R.id.tt_1);
31
32         //启动子线程  实现接口 Runnable,run()
33         new Thread(new Runnable() {
34             @Override
35             public void run() {
36
37                 //模拟进度变化
38                 for (int i=0;i<=100;i++){
39                     progressDialog.setProgress(i);
40
41                     try {
42                         Thread.sleep(200);
43                     }catch (Exception e){
44
45                     }
46                 }
47
48                 //在子线程里访问UI线程的View
49                 runOnUiThread(new Runnable() {
50                     @Override
51                     public void run() {
52
53                         tt_1.setText("拷贝完成");
54
55                     }
56                 });
57
58                 //执行完业务代码之后   关闭
59
60                 progressDialog.dismiss();
61             }
62         }).start();
63     }
64 }