Android 訪問assets下的文件

assets下經常可以放一些比較大的資源，對於這些資源我們如何訪問。

步驟

1.獲取AssetManager。
AssetManager am = getResources().getAssets();
2.利用AssetManager的open（String filePath）方法打開對應的輸入流。
InputStream is = am.open(assetsFileName);

讀取圖片文件保存到SD卡示例代碼

public  boolean saveToSDCard(String localFilePath, String fileName,
            Bitmap bitmap) {
        String extraPath = Environment.getExternalStorageDirectory().toString();
        // 使用絕對路徑
        extraPath = extraPath + "/" + "PaperCut"+"/"+localFilePath;
        // String path = null;
        File file = new File(extraPath);
        if (!file.exists())
            file.mkdirs();
        try {
            filePath = file.getPath() + "/" + fileName + ".png";
            File newFile = new File(filePath);
            if (newFile.exists()) {
                Toast.makeText(getApplicationContext(), R.string.finishTips1, // 已經保存過啦親
                        Toast.LENGTH_SHORT).show();
                return true;
            }else {
                FileOutputStream fileOutputStream = new FileOutputStream(filePath);
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
                // 另一種格式的結尾
                // bitmap.compress(CompressFormat.PNG, 50, fileOutputStream);
                fileOutputStream.flush();
                fileOutputStream.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
            // System.out.println(e.toString());
            return false;
        }
        return true;
    }
    private Bitmap getImageFromAssetsFile(int  position)  
      {  
          //Bitmap image = null;
          Bitmap image = null;
          String assetsFileName = null;
          assetsFileName = "album/"+is.imageMyChooseName.get(position)+"/1.png";
          //AssetManager從assets文件夾中獲取資源
          AssetManager am = getResources().getAssets();           
          try  
          {  
              InputStream is = am.open(assetsFileName); 
              //從InputStream解碼生成image
              image = BitmapFactory.decodeStream(is);  
              is.close();  
          }  
          catch (IOException e)  
          {  
              e.printStackTrace();  
          }  
          return image;  
      }
      //調用
          saveToSDCard("album","filePath"),getImageFromAssetsFile(position));