android 7 sdcard 写入,【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：