在实现程序功能的同时，如果能让程序界面更加美观，有锦上添花之妙.

先说思路:

1）皮肤也就是相关的资源文件单独放置在某个工程中,一种皮肤一个工程文件.一个工程包括N多的资源文件,多个工程间资源的关系是,文件名,资源ID等完全一样.不同的可能是图片资源,style等的设置不一样.

皮肤工程在AndroidManifest.xml中配置android:sharedUserId="com.eric.skinmain".

表明允许com.eric.skinmain访问本工程中的资源文件. com.eric.skinmain是主项目的包名

3）主项目通过 this.createPackageContext("com.eric.blackskin",Context.CONTEXT_IGNORE_SECURITY);

获取到com.eric.blackskin对应的Context,然后通过返回的context对象就可以访问到com.eric.blackskin中的任何资源,如同访问自身的资源一样.

注：记得先安装皮肤工程对应的apk文件.

public class main extends Activity { 
        /** Called when the activity is first created. */ 
        private LinearLayout showBg; 
        private Button btn; 
        private Context green_skin_Context = null; 
        private Context black_skin_Context = null; 
        int flag = 0; 
 
        @Override 
        public void onCreate(Bundle savedInstanceState) { 
                super.onCreate(savedInstanceState); 
                setContentView(R.layout.main); 
                showBg = (LinearLayout) findViewById(R.id.linear_layout_1); 
                try { 
                        green_skin_Context = this.createPackageContext( 
                                        "com.eric.greenskin", Context.CONTEXT_IGNORE_SECURITY); 
                } catch (NameNotFoundException e) { 
                        e.printStackTrace(); 
                } 
                try { 
                        black_skin_Context = this.createPackageContext( 
                                        "com.eric.blackskin", Context.CONTEXT_IGNORE_SECURITY); 
                } catch (NameNotFoundException e) { 
                        e.printStackTrace(); 
                } 
                btn = (Button) findViewById(R.id.btn_change_skin); 
                btn.setOnClickListener(new OnClickListener() { 
                        @Override 
                        public void onClick(View v) { 
                                if (flag == 0) { 
                                        showBg.setBackgroundDrawable(green_skin_Context 
                                                        .getResources().getDrawable(R.drawable.bg)); 
                                        btn.setBackgroundDrawable(green_skin_Context 
                                                        .getResources().getDrawable(R.drawable.btn_normal)); 
                                         
                                        flag = 1; 
                                } else if (flag == 1) { 
                                        showBg.setBackgroundDrawable(black_skin_Context 
                                                        .getResources().getDrawable(R.drawable.bg)); 
                                        btn.setBackgroundDrawable(black_skin_Context 
                                                        .getResources().getDrawable(R.drawable.btn_normal)); 
                                        flag = 0; 
                                } 
                        } 
                }); 
        } 
}