个人android札记(四)

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 block
					e.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:
个人android札记(四)
代码实现:
array = getResources().getStringArray(R.array.you_choice);
		new AlertDialog.Builder(this).setTitle("请选择").setItems(array, new DialogInterface.OnClickListener() {			
			@Override
			public 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)
;