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MainActivity如下:

import android.app.Activity;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.app.ProgressDialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {    private Button mListButton;    private Button mProgressButton;    private Dialog mListDialog;    private ProgressDialog mProgressDialog;    private int currentProgress=0;    private int maxProgress=100;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		init();	}    private void init(){    	mListButton=(Button) findViewById(R.id.listDialogButton);    	mListButton.setOnClickListener(new ButtonOnClickListenerImpl());    	mProgressButton=(Button) findViewById(R.id.progressDialogButton);    	mProgressButton.setOnClickListener(new ButtonOnClickListenerImpl());    }	private class ButtonOnClickListenerImpl implements OnClickListener {		@Override		public void onClick(View view) {			switch (view.getId()) {			case R.id.listDialogButton:                Builder listBuilder=new Builder(MainActivity.this);                listBuilder.setIcon(R.drawable.ic_launcher);                listBuilder.setTitle(getResources().getString(R.string.list_dialog_title));                listBuilder.setItems(getResources().getStringArray(R.array.listDialogArray), new DialogInterface.OnClickListener() {					@Override					public void onClick(DialogInterface dialog, int which) {						String selected=getResources().getStringArray(R.array.listDialogArray)[which];						Toast.makeText(MainActivity.this,selected, Toast.LENGTH_SHORT).show();					}				});                mListDialog=listBuilder.create();                mListDialog.show();                break;			case R.id.progressDialogButton:				mProgressDialog=new ProgressDialog(MainActivity.this);				mProgressDialog.setMax(maxProgress);				mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);  				mProgressDialog.setTitle(R.string.progress_dialog_title);				mProgressDialog.setIcon(R.drawable.ic_launcher);				mProgressDialog.setMessage(getResources().getString(R.string.progress_dialog_message));				mProgressDialog.setCancelable(false);                mProgressDialog.show();                new Thread(){                	public void run() {                		try {                			while(currentProgress<=maxProgress){                    			mProgressDialog.setProgress(currentProgress++);                    			Thread.sleep(500);                    		}                			mProgressDialog.cancel();						} catch (Exception e) {							mProgressDialog.cancel();						}                		                	};                }.start();               				break;			default:				break;			}		}	}	}

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