来源: 互联网  发布时间: 2014-02-18

关于Style的用法例子

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<style name="TitleStyle">
		<item name="android:textSize">18sp</item>
		<item name="android:textColor">#ec9237</item>
	</style>
	<style name="LinkStyle">
		<item name="android:textSize">18sp</item>
		<item name="android:textColor">#ec0032</item>
		<item name="android:fromAlpha">0.0</item>
		<item name="android:toAlpha">0.0</item>
	</style>
	<!-- <item name="android:windowBackground">@drawable/widget_style</item> -->
	
	
	<style name="SpecialEditText">
		<item name="android:textSize">16sp</item>
		<item name="android:textColor">@color/black</item>
		<item name="android:layout_marginLeft">20dp</item>
		<item name="android:layout_marginRight">20dp</item>
		<item name="android:layout_marginTop">8dp</item>
		<item name="android:background">@android:drawable/editbox_background</item>
	</style>
	
	<style name="SpecialTextView">
		<item name="android:textSize">16sp</item>
		<item name="android:textColor">@color/black</item>
		<item name="android:layout_marginLeft">20dp</item>
		<item name="android:layout_marginRight">20dp</item>
		<item name="android:layout_marginTop">8dp</item>
	</style>


</resources>  

可以在xml中利用

<EditText />

之类的进行测试,好像是所有组件的属性都可以在这里定义

    

    来源: 互联网  发布时间: 2014-02-18

横竖屏切换不重启activity的方法
部分网友会发现Activity在切换到后台或布局从横屏LANDSCAPE切换到PORTRAIT，会重新切换Activity会触发一次onCreate方法，我们可以在androidmanifest.xml中的activit元素加入这个属性android:configChanges="orientation|keyboardHidden" 即可，比如
<activity android:name=".android123" android:configChanges="orientation|keyboardHidden" android:label="@string/app_name">

    /* 声明Display对象，以取得屏幕宽高 */
    final Display defaultDisplay = getWindow().getWindowManager()
        .getDefaultDisplay();

    intScreenH = defaultDisplay.getHeight();
    intScreenW = defaultDisplay.getWidth();

    /* 如果为Landscape */
    if (intScreenW > intScreenH)
    {
      /* Landscape => Portrait */
      setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    } else
    {
      /* Portrait => Landscape */
     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    }

同时在Activity的Java文件中重载onConfigurationChanged(Configuration newConfig)这个方法，这样就不会在布局切换或窗口切换时重载onCreate等方法。代码如下:

@Override 
    public void onConfigurationChanged(Configuration newConfig)
    { 
        super.onConfigurationChanged(newConfig); 
     if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
     {
//land
     }
     else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
     {
//port
     }
    } 

    

    来源: 互联网  发布时间: 2014-02-18

使listView中有些条目可用，有些不可用
有时候，我们需要listView中有些条目可用，有些不可用。如何设置呢？
其实很简单，只要重写isEnabled(int position)就可以了，看下面的例子.

public class List5 extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setListAdapter(new MyListAdapter(this));
    }

    private class MyListAdapter extends BaseAdapter {
        public MyListAdapter(Context context) {
            mContext = context;
        }

        public int getCount() {
            return mStrings.length;
        }

        @Override
        public boolean areAllItemsEnabled() {
            return true;
        }

        @Override
        public boolean isEnabled(int position) {
            return !mStrings[position].startsWith("-");
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            TextView tv;
            if (convertView == null) {
                tv = (TextView) LayoutInflater.from(mContext).inflate(
                        android.R.layout.simple_expandable_list_item_1, parent, false);
            } else {
                tv = (TextView) convertView;
            }
            tv.setText(mStrings[position]);
            return tv;
        }

        private Context mContext;
    }
    
    private String[] mStrings = {
            "----------",
            "----------",
            "Abbaye de Belloc",
            "Abbaye du Mont des Cats",
            "Abertam",
            "----------",
            "Abondance",
            "----------",
            "Ackawi",
            "Acorn",
            "Adelost",
            "Affidelice au Chablis",
            "Afuega'l Pitu",
            "Airag",
            "----------",
            "Airedale",
            "Aisy Cendre",
            "----------",
            "Allgauer Emmentaler",
            "Alverca",
            "Ambert",
            "American Cheese",
            "Ami du Chambertin",
            "----------",
            "----------",
            "Anejo Enchilado",
            "Anneau du Vic-Bilh",
            "Anthoriro",
            "----------",
            "----------"
    };

}