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>

<?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>

<?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>

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