ProgressDialog的用法示例

1.新建Android项目 ProgressDialog    在包andorid.huada下建文件ProgressDialogActivity.java

2.ProgressDialogActivity.java代码如下

package android.huada;


import android.app.Activity; 
import android.app.ProgressDialog; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message;

public class ProgressDialogActivity extends Activity
{
	/** Called when the activity is first created. */


	ProgressDialog progressDialog;


	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);


		progress("下载数据中", "请稍等......");
	}


	public void progress(String title, String message)
	{
		progressDialog = newProgressDialog(this);
		updateThread thread = new updateThread();
		progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
		progressDialog.setMessage(message);
		progressDialog.setTitle(title);
		progressDialog.setProgress(0);
		progressDialog.setMax(100);
		progressDialog.show();
		thread.start();


	}


	Handler handler = new Handler()
	{


		@Override
		public void handleMessage(Message msg)
		{
			// TODO Auto-generated method stub
			if (msg.what >= 100)
			{
				progressDialog.cancel();
			}
			progressDialog.setProgress(msg.what);
			super.handleMessage(msg);
		}


	};


	class updateThread extends Thread
	{
		publicvoid run()
		{
			handler.sendEmptyMessage(0);
			try
			{
				updateThread.sleep(1000);
				handler.sendEmptyMessage(10);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(20);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(30);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(40);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(50);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(60);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(70);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(80);
				updateThread.sleep(1000);
				handler.sendEmptyMessage(100);
				updateThread.sleep(1000);


			} catch (InterruptedException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}


		}
	};
}

3.配置文件main.xml代码如下

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello" 
    /> 
</LinearLayout>

4.此项目是通过线程及时修改UI，运行效果图如下