DialogDemo1-Android

MyDialogDemo.java(Activity)

package com.ecjtu.mldialogproject;
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.os.Bundle;
    public class MyDialogDemo extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            super.setContentView(R.layout.activity_main); //调用布局管理器
            Dialog dialog = new AlertDialog.Builder(this)
            .setTitle("对话框") //创建标题
            .setMessage("显示提示信息") //表示对话框中的内容
            .setIcon(R.drawable.pic_m) //设置LOGO
            .create(); //创建一个对话框
            dialog.show(); //显示对话框
        }
    }

activity_main.xml

<RelativeLayout xmlns:android=""
    xmlns:tools=""
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>