Android加载Assets目录中Xml布局文件

import android.content.Context;
import android.content.res.AssetManager;
import android.content.res.XmlResourceParser;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.LayoutInflater;
import android.view.View;
import java.io.IOException;
import java.io.InputStream;

/**
 * Created by yuge on 2017/11/8.
 */

public class AssetsViewHelper {
 private static Context mcontext;
 private static AssetsViewHelper assetsViewHelper;
 /**
  * assets 目录前缀
  */
 private static String assetsFile="assets/";
 private AssetsViewHelper(){
 }


 public static AssetsViewHelper width(Context context){
  mcontext=context.getApplicationContext();
  if(assetsViewHelper==null){
    synchronized (AssetsViewHelper.class){
     if(assetsViewHelper==null){
      assetsViewHelper=new AssetsViewHelper();
     }
    }
  }
  return assetsViewHelper;
 }

 /**
  * 获取layout方法
  * @param filename
  * @return
  */
 public View getAssetsLayout(String filename) {
  AssetManager am = mcontext.getResources().getAssets();
  try {
    XmlResourceParser parser = am.openXmlResourceParser(assetsFile + "activity_main.xml");
    LayoutInflater inflater = (LayoutInflater) mcontext.getSystemService(mcontext.LAYOUT_INFLATER_SERVICE);
    View inflate = inflater.inflate(parser, null);
    return inflate;
   } catch (IOException e) {
    e.printStackTrace();
    return null;
   }
 }
  /**
   * 根据 tag 获取 view 对象
   * @param viewGroup 父容器也就是activity的根布局
   * @param tag
   * @return
   */
 public View getViewByTag(View viewGroup,Object tag){
  return viewGroup.findViewWithTag(object);
 }

 /**
  * 获取assets 中图片的方法
  * @param fileName
  * @return
  */
  Bitmap getImageFromAssetsFile(String fileName)
 {
  Bitmap image = null;
  AssetManager am = mcontext.getResources().getAssets();
  try
  {
   InputStream is = am.open(assetsFile+fileName);
   image = BitmapFactory.decodeStream(is);
   is.close();
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }

  return image;

 }
}