Android中ProgressBar用法 Android中ProgressBar用法简单实例

时间:2021-03-20 马到成功人气:0

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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。

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