android应用程序制定皮肤

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.
2）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;
                                }

                        }

                });
        }
}