实现APP换肤功能

1.用自己的Layout实现layout监听

 

 

public class SkinActivity implements Layout{
SkinLayoutInflater  skinLayoutInflator;
protected void onCreate(Bundle saveInstanceState){
skinLayoutInflator = new SkinLayoutInflater();
   LayoutInflaterCompat.setFactory(getLayoutoutInflater().skinLayoutInflater);   
}

public void update(){

   SkinManager.loadPath("skin.apk");
   SkinManager.update();

}
}

 

 

 

2.实现自己的LayoutInflaterFactory

 

public class SkinLayoutInflater implements LayoutInflaterFactory{
SkinLayoutInflater skinLayoutInflater;

private 
public View createView(View parent,String name,String Context,AttributeSet attrs){
    View view = null;
    if(name.indexOf(".")!=-1)){//自定义控件
       view = createView(context,attrs,name);
    }else{//反射构造系统控件
       for(String pre:prefixList){
           view = createView(context,attrs,pre+name);
           if(view == null){break;}
      }
    }
}
//反射View
public View createView(String name,String Context,AttributeSet attrs){

Class viewClazz = context.getClassLoader().loadClass(name);
Contructor<? extends view> contructor = viewClazz.getContructor(new Class[](Context.class,AttrubuteSet.class));
contructor.setAccessible(true);

}
//对从apk插件中得到的颜色进行应用
public void apply(){
    for(SkinItem skinItem ：list){
       if("textColor".equals(skinItem.getAttrName())){
          if(view instanceof TextView){
              ((TextView)view).setTextColor(skinItem.getId());
          }else{
              ((TextView)view).setTextColor(SkinManager.getInstance().getColor(skinItem.getId()));
         }
       }
    }

}
//skinitem的包装类
class SkinItem{

   private String attrName;
   private String attrValue;

   String String attrType;

   int id;
}


private void parseView(Context context,AttributeSet attrs,View view,String name){

    for(int i=0;i<attrs.getAttributeCount();i++){
        String attrName = attrs.getAttributeName(i);
        String attrValue = attrs.getAttributeValue(i);

        if("background".equal(attrName)||"textColor".equal(attrName)){
             int id = Integer.parseInt(attrValue.substring(1));
              String entryName = context.getResources().getResourceEntryName(id);
             String typeName = context.getResources().getResourceTypeName(id);
              SkinItem skinItem =new SkinItem(attrName,id,entryName,typeName);
              list.add(skinItem);//收集换肤的ITem
        }
    }
        
     if(!list.isEmpty){
         SkinView skinview  = new SkinView 
     }


}

class SkinManager{

    private Context context;
    private Resource skinResource;
    private String skinPackageName;

    private static SkinManager ourInstance = new SkinManager();

    public SkinManager(){

    }

    public static SkinManager getInstance(){return ourInstance;}

        public void  init(Context context){

         this.context = context.getApplicationContext();
    }

    //加载apk路径
    public void loadSkin(File apkPath){

       PackageManager packageManager = coontext.getPackageManager();
       PackageInfo packageInfo = packageManager.getPackagerArchiveInfo(apkPath.getAbsolutePath,PackageManager.GET_ACTIVITIE);//这里很重要，根据packageManage来加载apk包信息和包资源

       skinPackageName = packageInfo.packageName;

          AssetManager assetManager  = AssetManager.class.newInstance();
          Method addAssetPath()=assetManager.getClass.getClass.getMethod("addAssetPath",String.class);
          addAssetPath.invoke(assetManager.apkPath.getAbsoluteFile());
          skinResource = new Resource(assetManager,context.getResources().getDisplayMetries,context.getResources().getContext);      

   }
    //对每个View进行更新
    public void update(){
        for(View view : cacheMap.keySet()){
              SkinView skinitem = cacheMap.get(view);
              skinItem.apply();
        }
   
   }
  public int getColor(int resId){
      
        if(skinResource == null){
               return resId;
        }
        String resName = context.getResources().getResoucesEntryName(resId);//得到资源名
        int skinId = skinResource.getIndentifier(resName,"color",skinPackageName);//通过资源名去拿到皮肤ID
        return skinResource.getColors(resId);
  }


}


class SkinView{

     private View view;
     private List<SkinItem> list;

     public SkinView(View view,List<SkinItem> list>) {
         this.view = view;
         this.list = list;
     }
     //将ViewItem里面需要换肤的进行更新
     public void apply(){
         
        for(SkinItem skinItem :list){
               if("textColor".equals(skinItem.getAttrName())){
                   if(view instanceof TextView){
                       (TextView)view .setTextColor(skinItem.getId());
                   }else if(view instanceof Button){
                       (TextView)viwe.setTextColor(skinItem.getId);
                   }
                }
        }
     }
}
}