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   源码介绍

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package com.wjq.dia;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.Toast;

public class Main extends Activity implements android.view.View.OnClickListener {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		findViewById(R.id.btnicon).setOnClickListener(this);
		findViewById(R.id.btnsimpleview).setOnClickListener(this);
		findViewById(R.id.btnmultichoiceitems).setOnClickListener(this);
		findViewById(R.id.btnsinglechoiceitems).setOnClickListener(this);
		findViewById(R.id.btnsimpleitems).setOnClickListener(this);
		findViewById(R.id.btnviewlayout).setOnClickListener(this);
	}

	/**
	 * 当按返回键时的提示对话框,采用默认样式
	 */
	protected void dialog() {
		AlertDialog.Builder builder = new Builder(Main.this);
		builder.setMessage("确认退出吗？");

		builder.setTitle("提示");

		builder.setPositiveButton("确认", new OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				dialog.dismiss();

				Main.this.finish();
			}
		});

		builder.setNegativeButton("取消", new OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				dialog.dismiss();
			}
		});

		builder.create().show();
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
			dialog();
		}
		return false;
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		/**
		 * 改变图表
		 */
		case R.id.btnicon:
			Dialog dialog = new AlertDialog.Builder(this).setIcon(
					android.R.drawable.btn_star).setTitle("喜好调查").setMessage(
					"你喜欢李连杰的电影吗？").setPositiveButton("很喜欢",
					new OnClickListener() {

						@Override
						public void onClick(DialogInterface dialog, int which) {
							// TODO Auto-generated method stub
							Toast.makeText(Main.this, "我很喜欢他的电影。",
									Toast.LENGTH_LONG).show();
						}
					}).setNegativeButton("不喜欢", new OnClickListener() {

				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
					Toast.makeText(Main.this, "我不喜欢他的电影。", Toast.LENGTH_LONG)
							.show();
				}
			}).setNeutralButton("一般", new OnClickListener() {

				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
					Toast.makeText(Main.this, "谈不上喜欢不喜欢。", Toast.LENGTH_LONG)
							.show();
				}
			}).create();

			dialog.show();
			break;

		/**
		 * 改变显示信息内容的类型，本例是一个编辑框EditText
		 */
		case R.id.btnsimpleview:
			new AlertDialog.Builder(this).setTitle("请输入").setIcon(
					android.R.drawable.ic_dialog_info).setView(
					new EditText(this)).setPositiveButton("确定", null)
					.setNegativeButton("取消", null).show();

			break;

		case R.id.btnmultichoiceitems:
			new AlertDialog.Builder(this).setTitle("复选框").setMultiChoiceItems(
					new String[] { "Item1", "Item2"}, null, null)
					.setPositiveButton("确定", null)
					.setNegativeButton("取消", null).show();

			break;

		case R.id.btnsinglechoiceitems:
			new AlertDialog.Builder(this).setTitle("单选框").setIcon(
					android.R.drawable.ic_dialog_info).setSingleChoiceItems(
					new String[] {"Item1", "Item2"}, 0,
					new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							dialog.dismiss();
						}
					}).setNegativeButton("取消", null).show();

			break;

		case R.id.btnsimpleitems:
			new AlertDialog.Builder(this).setTitle("列表框").setItems(
					new String[] { "Item1", "Item2" }, null)
					.setNegativeButton("确定", null).show();

			break;

		case R.id.btnviewlayout:
			LayoutInflater inflater=getLayoutInflater();
			View layout=inflater.inflate(R.layout.dialog, (ViewGroup)findViewById(R.id.dialog));
			
			
			new AlertDialog.Builder(this).setTitle("自定义布局").setView(layout)
					.setPositiveButton("确定", null)
					.setNegativeButton("取消", null).show();

			break;
		}

	}
}