Android弹出对话框简单代码

package com.zxing.dialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class DialogTest extends Activity {
	private static final int DIALOG	=	1;
	
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btn	=	(Button)findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				showDialog(DIALOG);//Activity里面的函数,然后调用onCreateDialog这个方法,最后调用onPrepareDialog这个方法			}
		});
    }

	@Override
	protected Dialog onCreateDialog(int id) {
		// TODO Auto-generated method stub
		if(id==1){
		return this.buildDialog(DialogTest.this);
		}else{
			return null;
		}
	}

	@Override
	protected void onPrepareDialog(int id, Dialog dialog) {
		// TODO Auto-generated method stub
		super.onPrepareDialog(DIALOG, dialog);
	}
    
    private Dialog buildDialog(Context context){
    	AlertDialog.Builder builder	=	new AlertDialog.Builder(context);
    	builder.setIcon(R.drawable.alert_dialog_icon);
    	builder.setTitle(R.string.alertitle);
    	builder.setPositiveButton(R.string.right,new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				setTitle("您单击了对话框上面的正确按钮");
			}
		});
    	
    	return builder.create();
    }
    
}