文件读取权限

原创于 2016-02-16 11:43:29 发布 · 466 阅读

0 ·

CC 4.0 BY-SA版权

本文详细介绍了如何在Android中读取sdcard上的文件以及进行内存文件的读写操作，包括从sdcard读取文件的步骤、读取内存文件的方法以及如何往内存中写入文件的实践技巧。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

读取sdcard文件

String state = Environment.getExternalStorageState();
		if(Environment.MEDIA_MOUNTED.equals(state)){
			if(Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)){
				//只能读数据
			}else{
				String path = Environment.getExternalStorageDirectory().getPath();
				String path2 = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath();
			}
		}

读取内存文件

try {
			FileInputStream in = openFileInput("huaxin.txt");
			byte [] buffer = new byte[1024];
			int len;
			StringBuffer sb = new StringBuffer();
			while((len = in.read(buffer)) != -1){
				sb.append(new String(buffer,0,len,"UTF-8"));
			}
			System.out.println(sb.toString());
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

往内存写文件

try {
			FileOutputStream out = openFileOutput("huaxin.txt", Context.MODE_PRIVATE);
			out.write("I am huaxin".getBytes("UTF-8"));
			out.flush();
			out.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}