Android detects memory cards and the amount of space left on the phone (based on Environment,statfs and DecimalFormat) _android

This article is an example of how Android detects memory cards and the amount of space left in the phone. Share to everyone for your reference, specific as follows:

Android environment can be used to detect whether a phone has a memory card installed and a file storage path. Statfs can get the size of the memory card and the amount of space remaining. DecimalFormat can be achieved by dividing the number into a certain format.

The specific procedures are as follows:

Import Java.io.File;
Import Java.text.DecimalFormat;
Import android.app.Activity;
Import Android.os.Bundle;
Import android.os.Environment;
Import Android.os.StatFs;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.Button;
Import Android.widget.ProgressBar;
Import Android.widget.TextView; public class A08activity extends activity {Private TextView tv;//used to display memory card private Button b;//trigger detect memory card event private Progr The Essbar pb;//uses ProgressBar to display the status of the memory card/** called when the "activity is".
    * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main);
    tv= (TextView) Findviewbyid (r.id.tv);
    b= (Button) Findviewbyid (R.id.button);
    pb= (ProgressBar) Findviewbyid (R.ID.PB); B.setonclicklistener (New Onclicklistener () {@Override public void OnClick (View v) {//TODO auto-generated Method St
  UB Showsize ();//To detect storage card storage}}); } protected void Showsize (){//TODO auto-generated Method stub Tv.settext ("");
 Pb.setprogress (0);
  Used to detect if the memory card exists if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//If the memory card exists, get the path to the stored file
  File path=environment.getexternalstoragedirectory (); Statfs sf=new Statfs (Path.getpath ());//Create Statfs Object long blocksize=sf.getblocksize ();//Get blockSize long totalblock=
  Sf.getblockcount ();//Get all block long availableblock=sf.getavailableblocks ();//Get available block//string array to store block information
  String[] Total=filesize (totalblock*blocksize);
  String[] Available=filesize (availableblock*blocksize);
  Displays the size of the available space in ProgressBar int a=integer.parseint (available[0]);
  Pb.setprogress (a);
  String s= "SD card space in total:" +total[0]+total[1]+ "\ n";
  s+= "Remaining space size:" +available[0]+available[1];
 Tv.settext (s);
 else if (environment.getexternalstoragestate (). Equals (environment.media_removed)) {tv.settext ("SD card has been removed");
 }///used to define storage space display format public string[] FileSize (long size) {String s= "";
  if (size>1024) {s= "KB"; size/= 1024;
  if (size>1024) {s= "MB";
  size/=1024;
 } DecimalFormat df=new DecimalFormat ();
 Df.setgroupingsize (3);
 String[] Result=new string[3];
 Result[0]=df.format (size);
 Result[1]=s;
 return result;

 }
}

More interested readers of Android-related content can view this site: "The summary of Android controls usage" and "Android Development introduction and Advanced Course"

I hope this article will help you with the Android program.