ProgressDialog进度条对话框

(一）

1.效果图：

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.example.administrator.hello3.MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="显示进度条" />
</RelativeLayout>

3.MainActivity.java

package com.example.administrator.hello3;

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

public class MainActivity extends Activity {

    private Button button;
    private ProgressDialog pd;
    private final static  int MAXVALUE=100;
    private int progressStatus =0; //进度条对话框的百分比情况
    private int data[] = new int[100];//填充数组
    private  int current = 0;
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if(msg.what==0x123){
                pd.setProgress(progressStatus);
            }

            super.handleMessage(msg);
        }
    };

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

        button=(Button)findViewById(R.id.btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressStatus=0;
                current=0;
                pd=new ProgressDialog(MainActivity.this);
                pd.setMax(MAXVALUE);
                pd.setTitle("任务完成百分比");
                pd.setMessage("耗时任务完成百分比");
                pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

                pd.show();

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        while (progressStatus<MAXVALUE){
                            progressStatus=MAXVALUE*dowork()/data.length;
                            handler.sendEmptyMessage(0x123);
                        }
                        if(progressStatus>=MAXVALUE){
                            pd.dismiss();
                        }
                    }
                }).start();
            }
        });
    }

    public  int dowork(){
        data[current++]=(int)(Math.random()*100);
        try {
            Thread.sleep(100);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        return current;
    }
}