举例说明android中ProgressBar的用法

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" >

</LinearLayout>

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