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：