drwx
read
write
excute
openFileOutput(name,drwx); 用系统api读取文件
设置文件生成的权限： public static boolean saveInfo( Context context, String userName, String userPass, int mode){
try { FileOutputStream fos; switch (mode) { case 0: fos = context.openFileOutput( "private.txt", Context.MODE_PRIVATE); fos.write((userName+"##"+userPass).getBytes()); fos.close(); break; case 1: fos = context.openFileOutput( "readable.txt", Context.MODE_WORLD_READABLE); fos.write((userName+"##"+userPass).getBytes()); fos.close(); break; case 2: fos = context.openFileOutput( "writeable.txt", Context.MODE_WORLD_WRITEABLE); fos.write((userName+"##"+userPass).getBytes()); fos.close(); break; case 3: fos = context.openFileOutput( "public.txt", Context.MODE_WORLD_READABLE+Context.MODE_WORLD_WRITEABLE); fos.write((userName+"##"+userPass).getBytes()); fos.close(); break; default: break; } return true; } catch (Exception e) { e.printStackTrace(); return false; } }
下面是读取文件和写入文件的程序代码：读取文件： public void readInfo(View view){ File file = new File("/data/data/com.aaron.login/files/public.txt"); FileInputStream fis; try { fis = new FileInputStream(file); BufferedReader br = new BufferedReader(new InputStreamReader(fis)); String result = br.readLine(); Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Toast.makeText(MainActivity.this, "读取文件失败", Toast.LENGTH_LONG).show(); } }
写入文件： public void writeInfo(View view){ File file = new File("/data/data/com.aaron.login/files/public.txt"); FileOutputStream fos; try { fos = new FileOutputStream(file); fos.write("hahaha".getBytes()); fos.close(); Toast.makeText(MainActivity.this, "写入文件成功", Toast.LENGTH_LONG).show(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Toast.makeText(MainActivity.this, "写入文件失败", Toast.LENGTH_LONG).show(); }
}