Android中ProgressDialog的简单示例
Android中ProgressDialog的使用: http://skycode.iteye.com/blog/346960
Android中ProgressDialog的简单示例： http://lveyo.iteye.com/blog/585771
Android ProgressDialog的两种用法: http://www.pocketdigi.com/20110510/271.html
在android中，通常我们无法在单独的线程中更新UI，而要在主线程中，这也就是为什么我们要使用 Handler了，当handler收到消息中，它会把它放入到队列中等待执行，通常来说这会很快被执行。
<?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:id="@+id/textview1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="ShowProgressDialog" /></LinearLayout>
package com.progress.dialog;import android.app.Activity;import android.app.ProgressDialog;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;public class ProgressDialogActivity extends Activity { /** Called when the activity is first created. */private Button button1;private TextView textview1;private ProgressDialog progressDialog;private Handler handler = new Handler(){ @Override public void handleMessage(android.os.Message msg) { try { if (progressDialog != null) {progressDialog.dismiss();} textview1.setText("关闭等待框."); } catch (Exception e) {// TODO: handle exceptionLog.v("ProgressDialogActivity", e.getMessage());} }; }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button1 = (Button) findViewById(R.id.button1); textview1 = (TextView)findViewById(R.id.textview1); button1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// 创建并赋值给 progressDialogprogressDialog = ProgressDialog.show(ProgressDialogActivity.this, "我的标题", "[3秒后关闭]Load......", true, false);textview1.setText("显示等待框.");//创建线程并启动new Thread(new Runnable(){@Overridepublic void run() {try {Thread.sleep(3000);handler.sendEmptyMessage(0);} catch (Exception e) {e.printStackTrace();}}}).start();}}); } }