android读写sd卡文件

读写sd卡文件，只需要用普通Java io就可以了，Environment.getExternalStorageDirectory()为sd卡路径的File

注意：用模拟器运行时需要加载sd卡支持，否则会报read-only system

一，写文件

try {

File myfile = new File(Environment.getExternalStorageDirectory(), "MyDemo.txt");

OutputStream os = new FileOutputStream(myfile);

os.write("hello".getBytes());

os.flush();

os.close();

} catch (Exception e) {

e.printStackTrace();

}

二，读文件

try{

File myfile = new File(Environment.getExternalStorageDirectory(), "MyDemo.txt");

InputStream file = new FileInputStream(myfile);

byte[] b = new byte[(int)myfile.length()];

file.read(b);

Log.d(TAG, new String(b));

}catch(Exception e){

e.printStackTrace();

}

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