Android中简单提示对话框

1. ShowDialog.java

package com.ShowDialog;
import android.app.Activity;
import android.os.Bundle;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class ShowDialog extends Activity {
 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button mybutton = (Button)findViewById(R.id.button1);
        mybutton.setOnClickListener(new OnClickListener(){
          public void onClick(View v) {//单击此按钮后显示对话框。对话框的布局定义在res\dialogshow.xml中
             LayoutInflater usingdialoglayoutxml = LayoutInflater.from(ShowDialog.this);
             final View myviewondialog = usingdialoglayoutxml.inflate(R.layout.dialogshow, null);//按照设定的布局显示对话框
          AlertDialog mydialoginstance = new AlertDialog.Builder(ShowDialog.this)
          .setIcon(R.drawable.icon)//图标，显示在对话框标题左侧
          .setTitle("用户登录界面")//对话框标题
          .setView(myviewondialog)//注意参数为上面定义的View实例名，意为显示R.layout.dialogshow.xml这个布局文件
          .setPositiveButton("确定", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int whichButton) {
            Toast.makeText(getApplicationContext(), "单击了确定按钮", Toast.LENGTH_LONG).show();
           }})
          .setNegativeButton("取消", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int whichButton) { 
            ShowDialog.this.finish();//退出程序
           }})
          .create();
         mydialoginstance.show(); //显示对话框
                }
        });
    }
}

2.自定义的对话框布局文件dialogshow.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical" > 
<TextView
 android:id="@+id/username_view"
 android:layout_height="wrap_content"
 android:layout_width="wrap_content"
 android:layout_marginLeft="20dip"
 android:layout_marginRight="20dip"
 android:text="用户名"
 android:gravity="left"/>
<EditText
 android:id="@+id/username_edit"
 android:layout_height="wrap_content"
 android:layout_width="fill_parent"
 android:layout_marginLeft="20dip"
 android:layout_marginRight="20dip"
 android:scrollHorizontally="true"
 android:autoText="false"
 android:capitalize="none"
  />
<TextView
 android:id="@+id/password_view"
 android:layout_height="wrap_content"
 android:layout_width="wrap_content"
 android:layout_marginLeft="20dip"
 android:layout_marginRight="20dip"
 android:text="密码"
 android:gravity="left"/>
<EditText
 android:id="@+id/password_edit"
 android:layout_height="wrap_content"
 android:layout_width="fill_parent"
 android:layout_marginLeft="20dip"
 android:layout_marginRight="20dip"
 android:scrollHorizontally="true"
 android:autoText="false"
 android:capitalize="none"
 android:gravity="fill_horizontal"
 android:password="true" /> 
</LinearLayout>

3.运行之后的效果

 

注意：LayoutInflater类的作用类似于findViewById()，不同点是LayoutInflater是用来找layout下xml布局文件并且实例化，而findViewById()是找具体xml下具体widget控件