Android-读取assets和raw资源文件-优快云博客

本文链接：https://blog.youkuaiyun.com/phs12104/article/details/7458668

本文介绍了一个名为ResourceUtils的工具类，该类提供了从Android项目的raw和assets文件夹中加载文本和图片资源的方法。通过使用此类，开发者可以轻松地读取资源文件内容或将图片资源转换为Bitmap对象。

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import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.http.util.EncodingUtils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class ResourceUtils {

publicstatic final String ENCODING = "UTF-8";


   //从resources中的raw 文件夹中获取文件并读取数据
   publicstatic String getFromRaw(Context context, int rawResourceId){
      String result = "";
      try {
         InputStream in =context.getResources().openRawResource(
               rawResourceId);
         // 获取文件的字节数
         int lenght = in.available();
         // 创建byte数组
         byte[] buffer = new byte[lenght];
         // 将文件中的数据读到byte数组中
         in.read(buffer);
         result = EncodingUtils.getString(buffer,ENCODING);
      } catch (Exception e) {
         e.printStackTrace();
      }
      return result;
   }

   // 从assets文件夹中获取文件并读取数据
   publicstatic String getFromAssets(Context context, String fileName){
      String result = "";
      try {
         InputStream in =context.getResources().getAssets().open(fileName);
         // 获取文件的字节数
         int lenght = in.available();
         // 创建byte数组
         byte[] buffer = new byte[lenght];
         // 将文件中的数据读到byte数组中
         in.read(buffer);
         result = EncodingUtils.getString(buffer,ENCODING);
      } catch (Exception e) {
         e.printStackTrace();
      }
      return result;
   }

   publicstatic Bitmap getImageFromAssets(Context context, String fileName){
      Bitmap bitmap;
      try {
         InputStream is =context.getResources().getAssets().open(fileName);
         bitmap = BitmapFactory.decodeStream(newFlushedInputStream(is));
         return bitmap;
      } catch (Exception e) {
         e.printStackTrace();
      }
      return null;
   }

   static classFlushedInputStream extends FilterInputStream {
      public FlushedInputStream(InputStreaminputStream) {
         super(inputStream);
      }

      @Override
      public long skip(long n) throws IOException{
         long totalBytesSkipped = 0L;
         while (totalBytesSkipped < n){
            long bytesSkipped = in.skip(n -totalBytesSkipped);
            if (bytesSkipped == 0L) {
               int b = read();
               if (b < 0) {
                  break; // we reached EOF
               } else {
                  bytesSkipped = 1; // we read one byte
               }
            }
            totalBytesSkipped += bytesSkipped;
         }
         return totalBytesSkipped;
      }
   }
}