Android基础-----Progress Dialog

ProgressDialog 是Android中很常用的处理后台线程显示前台界面的工具

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class TestProgressDialog extends Activity {
	private ProgressDialog dialog;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        dialog = new ProgressDialog(this);
		dialog.setMessage("运行中...");
		dialog.setIndeterminate(false);
		dialog.setCancelable(true);
		Button bt1=(Button)findViewById(R.id.button1);
		bt1.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				
				dialog.show();
				Thread thread = new Thread(new ThreadDemo());//开始线程,程序后台,前台是dialog
				thread.start();	
				
			}
		});
    }
	    
	       final Handler handle = new Handler()
	    	{
	    		@Override
	    		public void handleMessage(Message msg) 
	    		{	
	    			if(dialog!=null)
	    			{
	    				dialog.dismiss();
	    			}
	    			
	    			
	    			if( msg.what>0 )
	    			{
	    				Toast.makeText(TestProgressDialog.this, "线程成功结束", Toast.LENGTH_SHORT).show();
	    			}
	    			else
	    			{
	    				Toast.makeText(TestProgressDialog.this, "线程出现意外", Toast.LENGTH_SHORT).show();
	    			}
	    		}   
	    	};
	    	
	        Handler endSessionHandle = new Handler()
	    	{
	    		@Override
	    		public void handleMessage(Message msg) 
	    		{	
	    			finish();
	    		}   
	    	};
	    	  class ThreadDemo implements Runnable
	          {	
	      		public void run() 
	      		{ 
	      			int what = -1;
	      			
	                  try 
	                  {
	                  	for (int i=0;i<10;i++)
	                  {
	                  	
	                  	Thread.sleep(1000);//10秒的dialog显示
	                  	if (i==9)
	                  	{what=1;//走完之后信号置1
	                  	}
	                  }
	                  	
	                  	
	      				
	      			} 
	                  catch (Exception e) 
	                  {
	                  	e.printStackTrace();
	                  	Log.e("WeiboPub", e.getMessage());
	      			}	
	      			handle.sendEmptyMessage(what);
	      		}
	      	
	      }
 }