Android中ProgressBar用法简单实例

本文实例讲述了Android中ProgressBar用法。分享给大家供大家参考，具体如下：

在android中会经常用到ProgressBar,下面通过举例来说明如何使用ProgressBar。

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
public class A03Activity extends Activity {
private ProgressBar rectangle,circle;
private Button showProgressBar;
private final static int STOP=0x10000;
private final static int NEXT=0x10001;
private int count=0;
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   rectangle=(ProgressBar)findViewById(R.id.rectangle);
   circle=(ProgressBar)findViewById(R.id.circle);
   showProgressBar=(Button)findViewById(R.id.showProgressBar);
   rectangle.setIndeterminate(false);
   circle.setIndeterminate(false);
   showProgressBar.setOnClickListener(new OnClickListener(){
 @Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 rectangle.setVisibility(View.VISIBLE);
 circle.setVisibility(View.VISIBLE);
 rectangle.setMax(100);
 rectangle.setProgress(0);
 circle.setProgress(0);
 Thread t=new Thread(new Runnable(){
  @Override
  public void run() {
  // TODO Auto-generated method stub
  for(int i=0;i<20;i++){
   try {
   count=(i+1)*5;
   Thread.sleep(1000);
   if(count==19){
    Message msg=new Message();
    msg.what=STOP;
    handler.sendMessage(msg);
    break;
   }
   else{
    Message msg=new Message();
    msg.what=NEXT;
    handler.sendMessage(msg);
   }
   } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   }
  }
  }  
 });
 t.start();
 }
 });
 }
 private Handler handler=new Handler(){
  @SuppressWarnings("static-access")
public void handleMessage(Message msg){
  switch(msg.what){
  case STOP:
   rectangle.setVisibility(View.GONE);
   circle.setVisibility(View.GONE);
   Thread.currentThread().interrupt();
   break;
  case NEXT:
   if(!Thread.currentThread().interrupted()){
   rectangle.setProgress(count);
   circle.setProgress(count);
   }
   break;
  }
  }
 };
}

res/layout/main.xml如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >
 <TextView
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello" />
 <ProgressBar
   android:id="@+id/rectangle"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   style="?android:attr/progressBarStyleHorizontal"
   mce_style="?android:attr/progressBarStyleHorizontal"
   android:visibility="gone"
   />
 <ProgressBar
   android:id="@+id/circle"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   style="?android:attr/progressBarStyleLarge"
   mce_style="?android:attr/progressBarStyleLarge"
   android:visibility="gone"    
   />
 <Button
   android:id="@+id/showProgressBar"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="show ProgressBar"
   />
</LinearLayout>

希望本文所述对大家Android程序设计有所帮助。