Android——模拟文件拷贝

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。

layout文件：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout 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.hanqi.testapp2.PractiseActivity6"
     android:orientation="vertical">

     <Button
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:text="文件拷贝__普通方式"
     android:onClick="bt_kaobei1"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="文件拷贝__消息机制"
         android:onClick="bt_kaobei2"/>
 </LinearLayout>

java类：

 package com.hanqi.testapp2;

 import android.app.ProgressDialog;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.widget.Toast;

 public class PractiseActivity6 extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_practise6);
     }
     public void bt_kaobei1(View v)
     {
         final ProgressDialog progressDialog = new ProgressDialog(this);
         progressDialog.setTitle("文件复制");
         progressDialog.setMessage("复制中，请等待……");
         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
         progressDialog.setCancelable(false);
         progressDialog.show();
         new Thread(){
             @Override
             public void run() {
                 for (int i=0;i<=100;i++)
                 {
                     progressDialog.setProgress(i);
                     try {
                         Thread.sleep(3000);
                     }
                     catch (Exception e)
                     {

                     }
                 }
                 runOnUiThread(new Runnable() {
                     @Override
                     public void run() {

                         Toast.makeText(PractiseActivity6.this, "文件拷贝完成", Toast.LENGTH_SHORT).show();
                     }
                 });
                 progressDialog.dismiss();
             }
         }.start();
     }
     Handler h = new Handler(){
         @Override
         public void handleMessage(Message msg) {
             super.handleMessage(msg);
             if (msg.what ==1)
             {
                 final ProgressDialog progressDialog = new ProgressDialog(PractiseActivity6.this);
                 progressDialog.setTitle("文件复制");
                 progressDialog.setMessage("复制中，请等待……");
                 progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                 progressDialog.setCancelable(false);
                 progressDialog.show();
                 new Thread(){
                     @Override
                     public void run() {
                         for (int i=0;i<=100;i++)
                         {
                             progressDialog.setProgress(i);
                             try {
                                 Thread.sleep(3000);
                             }
                             catch (Exception e)
                             {

                             }
                         }
                         runOnUiThread(new Runnable() {
                             @Override
                             public void run() {

                                 Toast.makeText(PractiseActivity6.this, "文件拷贝完成", Toast.LENGTH_SHORT).show();
                             }
                         });
                         progressDialog.dismiss();
                     }
                 }.start();
             }
         }
     };
     public void bt_kaobei2(View v)
     {
         new Thread(){
             @Override
             public void run() {
                 Message m = Message.obtain();
                 m.what = 1;
                 h.sendEmptyMessage(1);
             }
         }.start();
     }
 }

效果为：