Android SD卡读写文件
一、从sdcard中去读文件:
首先要把文件通过\android-sdk-windows\tools\adb.exe,
把本地计算机上的文件copy到sdcard上去,adb.exe push e:/Y.txt /sdcard/, 不可以用adb.exe push e:\Y.txt \sdcard\
同样: 把仿真器上的文件copy到本地计算机上用: adb pull ./data/data/com.tt/files/Test.txt e:/
String fileName = "/sdcard/Y.txt"; //也可以用String fileName = "mnt/sdcard/Y.txt"; String res=""; try{ FileInputStream fin = new FileInputStream(fileName); //FileInputStream fin = openFileInput(fileName); //用这个就不行了,必须用FileInputStream int length = fin.available(); byte [] buffer = new byte[length]; fin.read(buffer); res = EncodingUtils.getString(buffer, "UTF-8"); fin.close(); }catch(Exception e){ e.printStackTrace(); } myTextView.setText(res);
二、写文件:
一般写在\data\data\com.test\files\里面,打开DDMS查看file explorer是可以看到仿真器文件存放目录的结构的
String fileName = "TEST.txt"; String message = "FFFFFFF11111FFFFF" ; writeFileData(fileName, message); public voidwriteFileData(String fileName,String message){ try{ FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE); byte [] bytes = message.getBytes(); fout.write(bytes); fout.close(); } catch(Exception e){ e.printStackTrace(); } }
三、写, 读sdcard目录上的文件,要用FileOutputStream, 不能用openFileOutput:
//写在/mnt/sdcard/目录下面的文件 public voidwriteFileSdcard(String fileName,String message){ try{ //FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE); FileOutputStream fout = newFileOutputStream(fileName); byte [] bytes = message.getBytes(); fout.write(bytes); fout.close(); } catch(Exception e){ e.printStackTrace(); } } //读在/mnt/sdcard/目录下面的文件 public String readFileSdcard(String fileName){ String res=""; try{ FileInputStream fin = new FileInputStream(fileName); int length = fin.available(); byte [] buffer = new byte[length]; fin.read(buffer); res = EncodingUtils.getString(buffer, "UTF-8"); fin.close(); } catch(Exception e){ e.printStackTrace(); } return res; }