AlertDialog

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package com.yztc_alertdialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;

import com.yztc_popupwindow.R;

/**
* 演示AlertDialog
*/

public class DialogActivity extends Activity {private AlertDialog mDialog;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_dialog);    // 创建一个Dialog    initDialog();}// 初始化Dialogprivate void initDialog() {    AlertDialog.Builder builder = new AlertDialog.Builder(this);    // 方法链形式    builder.setTitle("标题").setIcon(android.R.drawable.btn_dialog)            .setMessage("是否退出")            .setPositiveButton("确定", new OnClickListener() {                // 确定按钮退出App                @Override                public void onClick(DialogInterface dialog, int which) {                    finish();                }            }).setNegativeButton("取消", null);// 取消什么都不做，可以设置    // 创建Dialog对象    mDialog = builder.create();}// 显示AlertDialogpublic void showDialog(View v) {    if (!mDialog.isShowing()) {        // 显示出来        mDialog.show();    }}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {    if ((keyCode == KeyEvent.KEYCODE_BACK) && (!mDialog.isShowing())) {        mDialog.show();        return true;    }    return super.onKeyDown(keyCode, event);    }}

布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".DialogActivity" ><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_centerInParent="true"    android:background="#82b74c"    android:onClick="showDialog"    android:text="显示Dialog"    android:textColor="#fff" /></RelativeLayout>

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