Android之警告對話框alertdialog

package com.example.android_alertdialog;

import android.support.v7.app.ActionBarActivity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
	
	private Button btn;
	private AlertDialog.Builder builder;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		btn=(Button) this.findViewById(R.id.button1);
		builder=new AlertDialog.Builder(this);//構建警告對話框
		builder.setTitle("提示框");
		builder.setMessage("您確定要刪除嗎？");
		builder.setIcon(R.drawable.ic_launcher);//加個小機器人圖標
		builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "確定刪除!", 1).show();
			}
		});
		builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "取消刪除!", 1).show();
			}
		});
		builder.setNeutralButton("忽略", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "忽略刪除!", 1).show();
			}
		});
		btn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				builder.show();//點擊的時候對話框彈出來
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}

運行效果圖如下