拷贝程序

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.administrator.testapp">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity" />
        <activity android:name=".test_activity6" />
        <activity android:name=".TestActivity7"></activity>
        <activity android:name=".TestActivity8" />
        <activity android:name=".Main2Activity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_mani2.xml

<?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"
    tools:context="com.example.administrator.testapp.Main2Activity"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="模拟拷贝"
        android:id="@+id/copy"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="消息机制"
        android:id="@+id/xj"/>
</LinearLayout>

普通方法：

package com.example.administrator.testapp;

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.Button;
import android.widget.TextView;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity
{
    Button copy,xj;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        copy=(Button)findViewById(R.id.copy);
        copy.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                final ProgressDialog progressDialog=new ProgressDialog(Main2Activity.this);
                progressDialog.setTitle("拷贝进度");
                progressDialog.setMessage("拷贝中...");
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.show();
                new Thread()
                {
                    @Override
                    public void run()
                    {
                        for (int i=0;i<=100;i++)
                        {
                            progressDialog.setProgress(i);
                            try
                            {
                                Thread.sleep(100);
                            }
                            catch (Exception e)
                            {
                                e.printStackTrace();
                            }
                        }
                        progressDialog.dismiss();
                        runOnUiThread(new Runnable()
                        {
                            @Override
                            public void run()
                            {
                                Toast.makeText(Main2Activity.this, "拷贝完成", Toast.LENGTH_SHORT).show();
                            }
                        });
                    }
                }.start();
            }
        });

消息机制

public class Main2Activity extends AppCompatActivity
{
    Button copy,xj;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        xj=(Button)findViewById(R.id.xj);
        xj.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                final ProgressDialog  progressdialog=new ProgressDialog(Main2Activity.this);
                progressdialog.setTitle("拷贝进度");
                progressdialog.setMessage("请稍后....");
                progressdialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressdialog.show();
                new Thread(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        for (int i=0;i<100;i++)
                        {
                            progressdialog.setProgress(i);
                            try
                            {
                                Thread.sleep(100);
                            }
                            catch (Exception e)
                            {
                                e.printStackTrace();
                            }
                        }
                        progressdialog.dismiss();
                        runOnUiThread(new Runnable()
                        {
                            @Override
                            public void run()
                            {
                                Toast.makeText(Main2Activity.this, "拷贝完成！", Toast.LENGTH_SHORT).show();
                            }
                        });
                    }
                }).start();
            }
        });
    }
}