个人android笔记(四)
1、ProgressDialog的简单应用:

ProgressDialog dialog = ProgressDialog.show(this, "hello", "are you sure???");new Thread(){public void run() {try {Thread.sleep(5000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}dialog.dismiss();};}.start();

ps:Thread.sleep不能放在主线程，否则的话ProgressDialog将不会显示

2、AlertDialog的另一种应用：

代码实现：

array = getResources().getStringArray(R.array.you_choice);new AlertDialog.Builder(this).setTitle("请选择").setItems(array, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}}).create().show();

定义array：res/values/Strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World!</string>    <string name="app_name">Android_SDK_Sample</string>    <array name="you_choice">    <item>牛肉</item>    <item>米饭</item>    <item>豆角</item>    </array></resources>

3、丰富界面显示，Theme的使用

  setTheme(R.style.Theme_AlphaTheme);setContentView(R.layout.ch3_19);

Theme_AlphaTheme定义在res/values/style.xml中

<?xml version="1.0" encoding="utf-8"?><resources>    <style name="mystyle">    <item name="android:textSize">18sp</item>    <item name="android:textColor">#EC9237</item>    <item name="android:fromAlpha">0.0</item>    <item name="android:toAlpha">0.0</item>    </style>    <style name="Theme" parent="android:Theme">    </style>        <style name="Theme.AlphaTheme">    <item name="android:background">#aaff00ff</item>    <item name="android:windowNoTitle">true</item>    <item name="android:colorForeground">@drawable/blue</item>    <item name="android:colorBackground">@drawable/pink</item>    </style></resources>

4、代码片段：
设置EditText中的文字是明文还是密文显示。
//明文

et.setTransformationMethod(HideReturnsTransformationMethod.getInstance());

//密文

et.setTransformationMethod(PasswordTransformationMethod.getInstance());

5、代码片段：一般我们在国际化的时候，需要改变当前系统的语系。程序实现如下：

   Resources res = getResources();Configuration conf = res.getConfiguration();conf.locale = Locale.JAPAN;DisplayMetrics dm = new DisplayMetrics();res.updateConfiguration(conf, dm)

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