安卓学习第20课——progressBar

<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"
    tools:context="com.example.progressbar.MainActivity$PlaceholderFragment" >


    <LinearLayout
        android:orientation="horizontal"
          android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <!-- 定义一个大环形进度条 -->
    <ProgressBar
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
  <!-- 定义一个普通环形进度条 -->
    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
  <!-- 定义一个小环形进度条 -->
    <ProgressBar
         style="?android:attr/progressBarStyleSmall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
       android:text="@string/progress" 
        />
    <!-- 水平进度条 -->
    <ProgressBar
        android:id="@+id/bar1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
         android:max="100" />
    <!-- 自定义水平进度条 -->
    <ProgressBar
       android:id="@+id/bar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:progressDrawable="@drawable/my_bar"
         android:max="100" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <!-- 定义轨道背景 -->
    <item android:id="@android:id/background"
        android:drawable="@drawable/no"></item>
<item android:id="@android:id/progress"
        android:drawable="@drawable/ok"></item>
</layer-list>

package com.example.progressbar;


import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ProgressBar;

public class MainActivity extends Activity {

    private int[] data=new int[100];
    int hasData=0;
    //记录完成进度
    int status=0;
    ProgressBar bar,bar1;
    //創建一个负责更新进度的handler
    Handler mhandler=new Handler(){
         public void handleMessage(Message msg) {
             if(msg.what==0x111){
                    bar.setProgress(status);
                    bar1.setProgress(status);
                }
            }
        
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    bar=(ProgressBar) findViewById(R.id.bar);
    bar1=(ProgressBar) findViewById(R.id.bar1);
    new Thread(){
        public void run(){
            while(status<100){
                //获取耗时操作的完成百分比
                status=doWork();
                //发送消息
                mhandler.sendEmptyMessage(0x111);
                
            }
        }
    }.start();
    }

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

只里面用到了线程，handler的知识。