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  • 获取Asset下文本内容和读取图片

      1  import android.content.Context;
      2 import android.content.res.AssetManager;
      3 import android.graphics.Bitmap;
      4 import android.graphics.BitmapFactory;
      5 
      6 import java.io.BufferedReader;
      7 import java.io.ByteArrayOutputStream;
      8 import java.io.IOException;
      9 import java.io.InputStream;
     10 import java.io.InputStreamReader;
     11 
     12 
     13 public class LocalFileUtils {
     14 
     15     /**
     16      * 获取Asset下文本内容
     17      * @param context
     18      * @param str
     19      * @return
     20      */
     21     public final static String getStringFormAsset(Context context, String str) {
     22         BufferedReader in = null;
     23         try {
     24             in = new BufferedReader(new InputStreamReader(context.getAssets().open(str)));
     25             String line;
     26             StringBuilder buffer = new StringBuilder();
     27             while ((line = in.readLine()) != null) {
     28                 buffer.append(line).append('
    ');
     29             }
     30             return buffer.toString();
     31         } catch (IOException e) {
     32             e.printStackTrace();
     33             return "";
     34         } finally {
     35             if (in != null) {
     36                 try {
     37                     in.close();
     38                     in = null;
     39                 } catch (IOException e) {
     40                     e.printStackTrace();
     41                 }
     42             }
     43         }
     44     }
     45 
     46     /**
     47      * @description 从Assets中读取图片
     48      *
     49      * @param context
     50      * @param fileName
     51      * @return 图片
     52      * @date 2015-6-11 15:00:55
     53      */
     54     public static Bitmap getImageFromAssetsFile(Context context, String fileName) {
     55         Bitmap image = null;
     56         AssetManager am = context.getAssets();
     57         InputStream is = null;
     58         try {
     59             is = am.open(fileName);
     60             image = BitmapFactory.decodeStream(is);
     61             return image;
     62         } catch (IOException e) {
     63             e.printStackTrace();
     64             return image;
     65         } finally {
     66             if(is != null) {
     67                 try {
     68                     is.close();
     69                     is = null;
     70                 } catch (IOException e) {
     71                     e.printStackTrace();
     72                 }
     73             }
     74         }
     75     }
     76 
     77     /**
     78      * 获取Raw下文本内容
     79      * @param context
     80      * @param rawId
     81      * @return
     82      */
     83     public final static String getStringFormRaw(Context context, int rawId) {
     84         ByteArrayOutputStream baos = null;
     85         InputStream in = context.getResources().openRawResource(rawId);
     86         try {
     87             baos = new ByteArrayOutputStream();
     88             byte[] buffer = new byte[1024];
     89             int len = 0;
     90             while ((len = in.read(buffer)) != -1) {
     91                 baos.write(buffer, 0, len);
     92             }
     93             baos.close();
     94             return baos.toString();
     95         } catch (Exception e) {
     96             e.printStackTrace();
     97             return "";
     98         } finally {
     99             if (baos != null) {
    100                 try {
    101                     baos.close();
    102                     baos = null;
    103                 } catch (IOException e) {
    104                     e.printStackTrace();
    105                 }
    106             }
    107         }
    108     }
    109 
    110 }
    1 long startTime4 = System.currentTimeMillis();
    2 String my_json = LocalFileUtils.getStringFormAsset(this, "testbean1.json");
    3 for (int n = 0; n < 100000; n++) {
    4    // 使用JSON 操作 工具将JSON字符串封装到实体类
    5    TestBean1 toBean = my_gson.fromJson(my_json, my_type); //JsonTool.toBean(json, TestBean1.class);
    6    System.out.println(toBean);
    7 }
    8 long endTime4 = System.currentTimeMillis() - startTime4;
    9 Log.i(TAG, "gson....." + endTime4);
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  • 原文地址:https://www.cnblogs.com/androidsj/p/5265266.html
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