Android - 在本机加载图像

Question

我想加载图像，以便我可以使用它们作为纹理。我有libpng，但如何找到一个图像的路径？将它放入.apk是不是一个好主意？有没有更好的办法？

Answer 1

这似乎有这样做的两种方式。我可以完成Simon N.提出的建议，也可以将图像转换为C数组并将其编译到源代码中。我选择做后者，因为我可以轻松地在本地进行。我甚至创建了一个用于将png文件转换为c数组头文件和源文件的python（v3.2）。它要求PyPNG

#!/usr/bin/env python 

import png 
import re 
import itertools 

def grouper(n, iterable, fillvalue=None): 
    args = [iter(iterable)] * n 
    return itertools.zip_longest(fillvalue=fillvalue, *args) 

def expand(array): 
    new_array = []; 
    for row in array: 
     for v in row: 
      new_array.append(v) 
    return new_array 

def c_array_name(filename): 
    '''converts the filename to the c array name''' 
    return re.sub(r'\W', '_', filename) 

def c_array_header_filename(filename): 
    '''converts the filename to the c array header filename''' 
    return "{0}.h".format(filename) 

def c_array_source_filename(filename): 
    '''converts the filename to the c array source filename''' 
    return "{0}.cpp".format(filename) 

def c_array_header(filename): 
    '''returns a string that is the c array header, 
    where 
     filename is the png file''' 
    name = c_array_name(filename) 
    return """ 
#ifndef __{0}__ 
#define __{0}__ 

#include <stdint.h> 

extern uint_least32_t const {1}[]; 

#endif /* __{0}__ */ 
""".format(name.upper(), name) 

def c_array_source(filename, header_filename, array_string): 
    '''returns a string that is the c array source, 
    where 
     name is the value from c_array_name 
     array_string''' 
    name = c_array_name(filename) 
    return """ 
#include "{0}" 

uint_least32_t const {1}[] = {{ 
{2} 
}}; 
""".format(header_filename, name, array_string) 

def convert_data_array_string(data): 
    '''returns a string of hexes of bytes, 
    where 
     data is a map of bytes''' 
    return ", ".join(["0x{:02x}{:02x}{:02x}{:02x}".format(a, b, g, r) 
     for r, g, b, a in grouper(4, expand(data), 0)]) 

def png_data_from_file(path): 
    '''returns a map of bytes of the png file''' 
    with open(path, 'rb') as file: 
     reader = png.Reader(file = file) 
     data = reader.read(); 
     return list(data[2]); 

if __name__ == '__main__': 
    import sys 
    import os 
    if len(sys.argv) != 2: 
     sys.stdout.write("{0} image_path".format(sys.argv[0])) 
     exit() 
    path = sys.argv[1] 
    filename = os.path.split(path)[1] 
    header_filename = c_array_header_filename(filename) 
    sys.stdout.write("Creating header file '{}'... ".format(header_filename)) 
    with open(header_filename, 'w') as header_file: 
     header_file.write(c_array_header(filename)) 
    sys.stdout.write("done\n") 
    source_filename = c_array_source_filename(filename) 
    sys.stdout.write("Creating source file '{}'... ".format(source_filename)) 
    data = png_data_from_file(path) 
    with open(source_filename, 'w') as source_file: 
     source_file.write(c_array_source(filename, header_filename, convert_data_array_string(data))) 
    del data 
    sys.stdout.write("done\n") 

Answer 2

看一看这样的：
http://www.anddev.org/ndk_opengl_-_loading_resources_and_assets_from_native_code-t11978.html