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


public class LoadExamActivity extends Activity implements Runnable{
    ProgressDialog pd;

    Handler Finished = new Handler(){
        @Override
        public void handleMessage(Message msg){
            Toast.makeText(getApplicationContext(),"DONE!",Toast.LENGTH_SHORT).show();
            pd.dismiss();
        }
    };

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.exam);
        Toast.makeText(this,"START!",Toast.LENGTH_SHORT).show();
        pd = new ProgressDialog(this);
        pd.show(this,"Waiting...","Please wait five seconds...");
        Thread th = new Thread(this);
        th.start();


    }

    public void run() {
        //To change body of implemented methods use File | Settings | File Templates.
        for (int i = 0; i < 5; i++)
        {
            try
            {
                Thread.sleep(1000);
            }catch(Exception e){}
        }
        Finished.sendEmptyMessage(0);
    }


}

五秒后显示“DONE”消息,但progressdialog没有被解雇,即使我把pd.dismiss()放在thr下面pd.show()我也不会忽略progressdialog,我不知道为什么会这样.这让我发疯了！