【Android】向sdcard中写入文件

一，添加函数

try {

File saveFile=new File("/sdcard/zhzhg.txt");

FileOutputStream outStream = new FileOutputStream(saveFile);
try {
outStream.write("文件的读写".getBytes());
}

catch (IOException ex)

{
Logger.getLogger(DeviceListActivity.class.getName()).log(Level.SEVERE, null, ex);
}
try

{
outStream.close();
}

catch (IOException ex)

{
Logger.getLogger(DeviceListActivity.class.getName()).log(Level.SEVERE, null, ex);
}
}

catch (FileNotFoundException ex)

{
Logger.getLogger(DeviceListActivity.class.getName()).log(Level.SEVERE, null, ex);

}

二，设置向存储卡读写权限

在AndroidMainfest.xml文件中添加：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>