android 学习随笔十九（对话框、样式、主题、国际化 ）

1、对话框

 package com.itheima.dialog;

 import android.os.Bundle;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
 import android.app.ProgressDialog;
 import android.content.DialogInterface;
 import android.content.DialogInterface.OnClickListener;
 import android.content.DialogInterface.OnMultiChoiceClickListener;
 import android.view.Menu;
 import android.view.View;
 import android.widget.Toast;

 public class MainActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }

     public void click1(View v){
         //创建对话框创建器
         AlertDialog.Builder builder = new Builder(this);
         //设置图标
         builder.setIcon(android.R.drawable.ic_dialog_alert);
         //设置标题
         builder.setTitle("警告");
         //设置内容
         builder.setMessage("欲练此功必先自宫，春晓你确定要自宫吗");

         //设置确定按钮
         builder.setPositiveButton("确定", new OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(MainActivity.this, "自宫完成，谢谢使用", 0).show();

             }
         });
         //设置取消按钮
         builder.setNegativeButton("取消", new OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(MainActivity.this, "若不自宫，一定不成功", 0).show();

             }
         });

         //显示对话框
         AlertDialog ad = builder.create();
         ad.show();
     }

     public void click2(View v){
         //创建对话框创建器
         AlertDialog.Builder builder = new Builder(this);
         //设置图标
         builder.setIcon(android.R.drawable.ic_dialog_alert);
         //设置标题
         builder.setTitle("选择您的家乡");

         final String[] items = new String[]{
                 "火星",
                 "塞伯坦",
                 "氪星",
                 "M78星云",
         };

         //设置单选选项
         builder.setSingleChoiceItems(items, 1, new OnClickListener() {

             //dialog:触发此方法执行的那个对话框
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(MainActivity.this, items[which], 0).show();
                 //对话框消失
                 dialog.dismiss();

             }
         });

         //显示对话框
         builder.show();
     }

     public void click3(View v){
         //创建对话框创建器
         AlertDialog.Builder builder = new Builder(this);
         //设置图标
         builder.setIcon(android.R.drawable.ic_dialog_alert);
         //设置标题
         builder.setTitle("选择您需要的武器");

         final String[] items = new String[]{
                 "板凳",
                 "啤酒瓶",
                 "开山刀",
                 "AK-47",
                 "爱国者",
                 "唐晓平"
         };

         final boolean[] checkedItems = new boolean[]{
                 true,
                 false,
                 false,
                 false,
                 false,
                 true
         };

         //设置多选选项
         builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                 //记录用户的选择
                 checkedItems[which] = isChecked;
             }
         });
         builder.setPositiveButton("确定", new OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 String text = "";
                 for (int i = 0; i < checkedItems.length; i++) {
                     text += checkedItems[i]? items[i] + "，": "";
                 }
                 Toast.makeText(MainActivity.this, text, 0).show();

             }
         });

         builder.show();
     }

     public void click4(View v){
         //创建进度条对话框
         final ProgressDialog dialog = new ProgressDialog(this);
         dialog.setIcon(android.R.drawable.ic_input_add);
         dialog.setTitle("正在自宫中，请稍候...");
         dialog.setMax(100);
         dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
         Thread t = new Thread(){
             public void run() {
                 for (int i = 0; i <= 100; i++) {
                     dialog.setProgress(i);
                     try {
                         sleep(20);
                     } catch (InterruptedException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     }
                 }
                 //自宫完成，进度消失
                 dialog.dismiss();
             }
         };
         t.start();
         dialog.show();
     }
 }

 <LinearLayout 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=".MainActivity"
     android:orientation="vertical"
     >

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="确定取消对话框"
         android:onClick="click1"
         />
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="单选对话框"
         android:onClick="click2"
         />
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="多选对话框"
         android:onClick="click3"
         />
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="进度条对话框"
         android:onClick="click4"
         />

 </LinearLayout>

2、样式和主题

 <LinearLayout 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=".MainActivity"
     android:orientation="vertical"
     >

     <TextView
         android:text="@string/hello_world"
         style="@style/lakesouthstyle"
         />
     <TextView
         android:text="@string/hello_world"
         style="@style/chunxiaostyle"
         />
     <TextView
         android:text="@string/hello_world"
         style="@style/lakesouthstyle.miaorunstyle"
         />
     <TextView
         android:text="@string/hello_world"
         style="@style/lakesouthstyle"
         />

 </LinearLayout>

在values目录下定义样式，主题和样式定义相同，主题应用在清单文件中（主题用于Activity），样式应用在布局文件中

 <resources xmlns:android="http://schemas.android.com/apk/res/android">

     <!--
         Base application theme, dependent on API level. This theme is replaced
         by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
     -->
     <style name="AppBaseTheme" parent="android:Theme.Light">
         <!--
             Theme customizations available in newer API levels can go in
             res/values-vXX/styles.xml, while customizations related to
             backward-compatibility can go here.
         -->
     </style>

     <!-- Application theme. -->
     <style name="AppTheme" parent="AppBaseTheme">
         <!-- All customizations that are NOT specific to a particular API-level can go here. -->
         <item name="android:background">#ff0000</item>
     </style>

     <style name="lakesouthstyle">
         <item name="android:layout_width">wrap_content</item>
         <item name="android:layout_height">wrap_content</item>
         <item name="android:textSize">30sp</item>
         <item name="android:textColor">#00ff00</item>
     </style>
     <style name="chunxiaostyle" parent="lakesouthstyle">
         <item name="android:textSize">20sp</item>
     </style>
     <style name="lakesouthstyle.miaorunstyle">
         <item name="android:textColor">#ff0000</item>
     </style>

 </resources>

3、国际化

根据语言需求定义values,values_zh,values_it,drawable-en-rUS（找出国家语言简写）等定义资源。

文本国际化

 <?xml version="1.0" encoding="utf-8"?>
 <resources>

     <string name="app_name">11_国际化</string>
     <string name="action_settings">Settings</string>
     <string name="hello_world">这是英文的你好世界</string>

 </resources>

values,英文

 <?xml version="1.0" encoding="utf-8"?>
 <resources>

     <string name="app_name">11_国际化</string>
     <string name="action_settings">Settings</string>
     <string name="hello_world">这是中文的你好世界</string>

 </resources>

values-zh

 <?xml version="1.0" encoding="utf-8"?>
 <resources>

     <string name="app_name">11_国际化</string>
     <string name="action_settings">Settings</string>
     <string name="hello_world">这是意大利文的你好世界</string>

 </resources>

values-it

图片也可以国际化，定义drawable-en-rGB、drawable-en-rUS等