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" >

<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>