ProgressBar的使用

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:id="@+id/textView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /><ProgressBarandroid:id="@+id/prgressBar"android:layout_width="wrap_content"android:layout_height="wrap_content"android:visibility="gone"style="?android:attr/progressBarStyleHorizontal"></ProgressBar><Buttonandroid:id="@+id/button"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="show progressbar"></Button></LinearLayout> 

ProDemonActivity.java

package com.itxinke.www;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.ProgressBar;import android.widget.TextView;public class ProDemonActivity extends Activity { /** Called when the activity is first created. */private Button button;private ProgressBar progressBar;private TextView textView;private int mCount;private Handler mHandler;private static final int STOP = 0x0;private static final int CON = 0x1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button = (Button)findViewById(R.id.button); progressBar = (ProgressBar)findViewById(R.id.prgressBar); textView = (TextView)findViewById(R.id.textView); progressBar.setIndeterminate(false); button.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View v){// TODO Auto-generated method stubprogressBar.setVisibility(View.VISIBLE);progressBar.setMax(100);progressBar.setProgress(0);new Thread(new Runnable(){@Overridepublic void run(){// TODO Auto-generated method stubfor(int i = 0;i < 10;i++){try{mCount = (i + 1) * 20;Thread.sleep(2000);Message msg = new Message();if(i == 4){msg.what = STOP;}else{msg.what = CON;}ProDemonActivity.this.mHandler.sendMessage(msg);}catch(Exception e){e.printStackTrace();}}}}).start();} }); mHandler = new Handler() {@Overridepublic void handleMessage(Message msg){// TODO Auto-generated method stubswitch(msg.what){case STOP:progressBar.setVisibility(View.GONE);textView.setText("stop");Thread.currentThread().interrupt();break;case CON:progressBar.setProgress(mCount);textView.setText("con" + progressBar.getProgress());break;}super.handleMessage(msg);} }; }}