A Safe Path to External Storage

Question

For my app, I have a fairly large database that needs to be stored on the user\'s device. I plan to change this in the future. For now, however, I\'d like to store it to the

Answer 1

I have a samsung galaxy s3 (running android 4.1.2) and my internal memory is named sdCard0 and My external sd card named as extSdCard.

So Environment.getExternalStorageDirectory() returned the path of sdCard0 which my internal phone memory

In such cases you can use the following to get the actual path of the external storage. However this is not recommended. I suggest you follow the docs

http://developer.android.com/guide/topics/data/data-storage.html

String externalpath = new String();
String internalpath = new String();

public  void getExternalMounts() {
Runtime runtime = Runtime.getRuntime();
try
{
Process proc = runtime.exec("mount");
InputStream is = proc.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
String line;

BufferedReader br = new BufferedReader(isr);
while ((line = br.readLine()) != null) {
    if (line.contains("secure")) continue;
    if (line.contains("asec")) continue;

    if (line.contains("fat")) {//external card
        String columns[] = line.split(" ");
        if (columns != null && columns.length > 1) {
            externalpath = externalpath.concat("*" + columns[1] + "\n");
        }
} 
        else if (line.contains("fuse")) {//internal storage
        String columns[] = line.split(" ");
        if (columns != null && columns.length > 1) {
            internalpath = internalpath.concat(columns[1] + "\n");
        }
    }
}
}
catch(Exception e)
{
    e.printStackTrace();
}
System.out.println("Path  of sd card external............"+externalpath);
System.out.println("Path  of internal memory............"+internalpath);
}

The above works in most cases

 File dir = new File(externalpath + "/MyFolder");
 if(!dir.exists)
 {
 dir.mkdirs();
 dir.setReadOnly();
 }

Don't forget to add permission in manifest file

Also you should check if the sdcard is mounted on your device

  if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)
  {
       // sdcard mounted
  }