Android DEV : Amazing Theme and Style

Android DEV : Amazing Theme and Style

    工作上需要动态改变app字体大小,而我的LAC也可能需要这个,于是半公半私地看起来...google了很多页面,越发觉得Theme和Style神奇了...

    咱也讲不好,还是直接放上几段代码做记录吧...

    styles.xml

< resources >
     < style  name ="small_title_text" >
       < item  name ="android:textSize" >22sp </ item >
       < item  name ="android:textColor" >@color/color1 </ item >
       < item  name ="android:textStyle" >normal </ item >
       < item  name ="android:paddingBottom" >5dip </ item >
    </ style >
    < style  name ="small_body_text" >
       < item  name ="android:textSize" >16sp </ item >
       < item  name ="android:textColor" >@color/color1 </ item >
       < item  name ="android:textStyle" >normal </ item >
       < item  name ="android:paddingBottom" >5dip </ item >
    </ style >
    < style  name ="large_title_text" >
       < item  name ="android:textSize" >40sp </ item >
       < item  name ="android:textColor" >@color/color </ item >
       < item  name ="android:textStyle" >normal </ item >
       < item  name ="android:paddingBottom" >5dip </ item >
    </ style >

    < style  name ="large_body_text" >
       < item  name ="android:textSize" >20sp </ item >
       < item  name ="android:textColor" >@color/color </ item >
       < item  name ="android:textStyle" >normal </ item >
       < item  name ="android:paddingBottom" >5dip </ item >
    </ style >

   <!--  Base application theme is the default theme.  -->
   < style  name ="Theme"  parent ="android:Theme" >
   </ style >

   < style  name ="Theme.Small"  parent ="Theme" >
      < item  name ="textTitle" >@style/small_title_text </ item >
      < item  name ="textBody" >@style/small_body_text </ item >
   </ style >

   < style  name ="Theme.Large"   parent ="Theme" >
       < item  name ="textTitle" >@style/large_title_text </ item >
       < item  name ="textBody" >@style/large_body_text </ item >
   </ style >
    
</ resources >

    attrs.xml

<? xml version="1.0" encoding="utf-8" ?>
< resources >
        < attr  name ="textTitle"  format ="reference"   />
        < attr  name ="textBody"  format ="reference"   />    
</ resources >

    main.xml

< RelativeLayout  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"   >

     < TextView
         android:id ="@+id/textView1"
        style ="?textTitle"
        android:layout_width ="wrap_content"
        android:layout_height ="wrap_content"
        android:layout_alignParentLeft ="true"
        android:layout_alignParentTop ="true"
        android:text ="@string/hello_world"   />

     < Button
         android:id ="@+id/button1"
        style ="?textBody"
        android:layout_width ="match_parent"
        android:layout_height ="wrap_content"
        android:layout_alignLeft ="@+id/textView1"
        android:layout_below ="@+id/textView1"
        android:layout_marginTop ="14dp"
        android:text ="ToggleButton"   />

</ RelativeLayout >

    main.java

     protected  void onButtonClick() {
        
         if (toggle) {
             this.setTheme(R.style.Theme_Large);
            setContentView(R.layout.activity_main);
        }  else {
             this.setTheme(R.style.Theme_Small);
            setContentView(R.layout.activity_main);            
        }
        Button btn = (Button)  this.findViewById(R.id.button1);
        btn.setOnClickListener( new OnClickListener() {

            @Override
             public  void onClick(View arg0) {
                onButtonClick();
            }
            
        });
        
        toggle = !toggle;
    }

file://C:\Program Files\sdk\platforms\android-17\data\res
http://developer.android.com/guide/topics/ui/themes.html
http://stackoverflow.com/questions/3241729/android-dynamically-change-style-at-runtime