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。

<?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.MoniwenjianActivity"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击拷贝"
        android:onClick="mn1_OnClick"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="运行结果"
        android:id="@+id/tt_1"/>

</LinearLayout>

package com.hanqi.testapp2;

import android.app.ProgressDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MoniwenjianActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_moniwenjian);
    }

    public void mn1_OnClick(View v)
    {
        final ProgressDialog progressDialog=new ProgressDialog(this);

        progressDialog.setTitle("拷贝进度框");
        progressDialog.setMessage("正在拷贝...");
        progressDialog.setCancelable(false);

        //设置成水平
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        progressDialog.show();

        final TextView tt_1=(TextView)findViewById(R.id.tt_1);

        //启动子线程  实现接口 Runnable,run()
        new Thread(new Runnable() {
            @Override
            public void run() {

                //模拟进度变化
                for (int i=0;i<=100;i++){
                    progressDialog.setProgress(i);

                    try {
                        Thread.sleep(200);
                    }catch (Exception e){

                    }
                }

                //在子线程里访问UI线程的View
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {

                        tt_1.setText("拷贝完成");

                    }
                });

                //执行完业务代码之后   关闭

                progressDialog.dismiss();
            }
        }).start();
    }
}