安卓学习第38课——ProgressDialog

<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:orientation="vertical">

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="环形进度条" 
        android:onClick="showSpinner"/>

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="不显示进度的进度条"
        android:onClick="showIndeterminate" />

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="显示进度的进度条"
        android:onClick="showProgress" />

</LinearLayout>

package com.example.progressdialog;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;

public class MainActivity extends Activity {

    final static int MAX_PROGRESS=100;
    private int[] data=new int [50];
    int progressStatus=0;
    int hasData=0;
    ProgressDialog pd1,pd2;
    //定义一个更新进度的handler
    Handler handler=new Handler(){
        public void handleMessage(Message msg){
            if(msg.what==0x123){
                pd2.setProgress(progressStatus);
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void showSpinner(View source){
        //环形进度条
        ProgressDialog.show(this, "任务执行中","任务执行中，请等待",false,true);
    }
    public void showIndeterminate(View source){
        pd1=new ProgressDialog(MainActivity.this);
        pd1.setTitle("任务正在执行中");
        pd1.setMessage("任务正在执行中，敬请期待。。。");
        pd1.setCancelable(true);
        pd1.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        pd1.setIndeterminate(true);
        pd1.show();
    }
    public void showProgress(View source){
        progressStatus=0;
        hasData=0;
        pd2=new ProgressDialog(MainActivity.this);
        pd2.setMax(MAX_PROGRESS);
        pd2.setTitle("任务完成百分比");
        pd2.setMessage("耗时任务的完成比");
        pd2.setCancelable(false);
        pd2.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        pd2.setIndeterminate(false);
        pd2.show();
        new Thread(){
            public void run(){
                while(progressStatus<MAX_PROGRESS){
                    progressStatus=MAX_PROGRESS*
                            doWork()/data.length;
                    handler.sendEmptyMessage(0x123);
                }
                if(progressStatus>=MAX_PROGRESS){
                    pd2.dismiss();
                }
            }
        }.start();
        
    }
    public int doWork() {
        data[hasData++]=(int) (Math.random()*100);
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return hasData;
    }

}