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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. */@Overridepublic 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(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubrectangle.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 blocke.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" ><TextViewandroid: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>
更多关于Android控件相关内容感兴趣的读者可查看本站专题:《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。