android 入门demo 进度条

package com.isoftstone.cry;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ProgressBar;public class ProgressBarDialog extends Activity {private Button btn1 ,btn2 ;private ProgressBar progressBar ;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.progressbar);btn1 = (Button)findViewById(R.id.progressBarbutton1);btn2 = (Button)findViewById(R.id.progressBarbutton2);progressBar = (ProgressBar)findViewById(R.id.progressBar1);btn1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubprogressBar.incrementProgressBy(10);}});btn2.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubprogressBar.incrementProgressBy(-10);}});}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/progressBarbutton1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button1" />    <Button        android:id="@+id/progressBarbutton2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button2" />    <ProgressBar        android:id="@+id/progressBar1"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

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