Very simple Android Open and Save dialog box features _android

There are no standard open and Save As dialog boxes on Android. In this code, I'll describe in detail a very simple implementation of the Open and Save dialog box, which is very useful for Android beginners, and dialog boxes are full screen active.

Main function:

1, access to any directory SD card
2, recursive access to the folder
3. Single File Selection
4, by pressing the Hardware Back button upgrade
5. Confirm File Select OK button

Activity_open_file.xml

<linearlayout xmlns:android= "<a href=" http://schemas.android.com/apk/res/android "rel=" nofollow "target=" _ Blank ">http://schemas.android.com/apk/res/android" </a> xmlns:tools= "<a href=" http:// Schemas.android.com/tools "" rel= "nofollow" target= "_blank" >http://schemas.android.com/tools "</a> Android 
    : layout_width= "match_parent" android:layout_height= "match_parent" android:orientation= "vertical" > <ListView Android:id= "@+id/lvlist" android:layout_width= "fill_parent" android:layout_height= "Fill_parent" android:l ayout_weight= "1" > </ListView> <linearlayout android:layout_width= "Match_parent" Android:layout_h eight= "wrap_content" android:orientation= "horizontal" > <button android:id= "@+id/btnok" Android : layout_width= "fill_parent" android:layout_height= "Wrap_content" android:layout_weight= "1" android:text=
    "OK"/> <button android:id= "@+id/btncancel"  Android:layout_width= "Fill_parent" android:layout_height= "Wrap_content" android:layout_weight= "1" Andr

 oid:text= "Cancel"/> </LinearLayout> </LinearLayout>

Openfileactivity.java

Package com.example.androidfiledialogs;
Import Java.io.File;
Import java.util.ArrayList;
Import java.util.Collections;
Import Java.util.Comparator;
Import android.app.Activity;
Import android.content.Intent;
Import Android.os.Bundle;
Import android.os.Environment;
Import Android.view.Menu;
Import Android.view.MenuItem;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.AdapterView;
Import Android.widget.AdapterView.OnItemClickListener;
Import Android.widget.AdapterView.OnItemLongClickListener;
Import Android.widget.AdapterView.OnItemSelectedListener;
Import Android.widget.ArrayAdapter;
Import Android.widget.Button;
Import Android.widget.ListView;
Import Android.widget.Spinner;


Import Android.widget.Toast;
  public class Openfileactivity extends activity implements Onclicklistener, Onitemclicklistener {ListView lvlist;
  arraylist<string> ListItems = new arraylist<string> ();
  Arrayadapter<string> adapter;
 Button Btnok; Button Btncancel;
  String currentpath = null; String selectedfilepath = null; /* Full path, i.e./mnt/sdcard/folder/file.txt */String selectedfilename = null; /* File Name only, i.e file.txt */@Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (s)
    Avedinstancestate);
    Setcontentview (R.layout.activity_open_file);
      try {/* initializing Widgets */lvlist = (ListView) Findviewbyid (r.id.lvlist);
      Btnok = (Button) Findviewbyid (R.id.btnok);    

      Btncancel = (Button) Findviewbyid (r.id.btncancel);
      /* Initializing Event Handlers * * Lvlist.setonitemclicklistener (this);
      Btnok.setonclicklistener (this);

      Btncancel.setonclicklistener (this);
    Setcurrentpath (Environment.getexternalstoragedirectory (). GetAbsolutePath () + "/");
          The catch (Exception ex) {Toast.maketext (this, "Error in Openfileactivity.oncreate:" + ex.getmessage (),
    Toast.length_short). Show ();

 }

  } void Setcurrentpath (String path) {arraylist<string> folders = new arraylist<string> ();
    arraylist<string> files = new arraylist<string> ();
    Currentpath = path;
    File Allentries = new file (path). Listfiles (); for (int i = 0; i < allentries.length i++) {if (Allentries.isdirectory ()) {Folders.Add (allentries.getn
      Ame ());
      else if (Allentries.isfile ()) {Files.add (Allentries.getname ()); } collections.sort (folders, new Comparator<string> () {@Override public int compare (String s1
      , String S2) {return s1.comparetoignorecase (S2);

     }
    });
        Collections.sort (Files, new comparator<string> () {@Override public int compare (string s1, string s2) {

      return s1.comparetoignorecase (S2);

    }

    });
    Listitems.clear ();
    for (int i = 0; i < folders.size (); i++) {Listitems.add (Folders.get (i) + "/"); for (int i = 0; I &lT Files.size ();

    i++) {Listitems.add (Files.get (i)); } adapter = new Arrayadapter<string> (this, Android.

    R.layout.simple_list_item_1, ListItems);

    

    Adapter.notifydatasetchanged ();

  Lvlist.setadapter (adapter); @Override public void onbackpressed () {if!currentpath.equals (environment.getexternalstoragedirector

    Y (). GetAbsolutePath () + "/") {Setcurrentpath (new File (Currentpath). GetParent () + "/");

    else {super.onbackpressed ();

    

    @Override public void OnClick (View v) {Intent Intent;

      Switch (V.getid ()) {Case r.id.btnok:intent = new Intent ();

      Intent.putextra ("FileName", Selectedfilepath);

      Intent.putextra ("ShortFileName", selectedfilename);

      

      Setresult (RESULT_OK, intent);

      

      This.finish ();

    Break

      Case r.id.btncancel:intent = new Intent (); Intent.putextra ("FileName "," ");

      Intent.putextra ("ShortFileName", "");

      

      Setresult (result_canceled, intent);

      

      This.finish ();

    Break

    @Override public void Onitemclick (adapterview<?> parent, view view, int position, long ID) {

    String entryname = (string) parent.getitematposition (position);

    if (Entryname.endswith ("/")) {Setcurrentpath (Currentpath + entryname);

      

      else {Selectedfilepath = Currentpath + entryname;

      

      Selectedfilename = EntryName;  This.settitle (This.getresources (). getString (R.string.title_activity_open_file) + "<span>[</span>" +

    EntryName + "]");

 }

  }

}

Activity_save_file.xml

<linearlayout xmlns:android= "<a href=" http://schemas.android.com/apk/res/android "rel=" nofollow "target=" _ Blank ">http://schemas.android.com/apk/res/android" </a> xmlns:tools= "<a href=" http:// Schemas.android.com/tools "" rel= "nofollow" target= "_blank" >http://schemas.android.com/tools "</a> Android : layout_width= "match_parent" android:layout_height= "match_parent" android:orientation= "vertical" > <ListVi

    EW android:id= "@+id/sfa_lvlist" android:layout_width= "fill_parent" android:layout_height= "Fill_parent" android:layout_weight= "1" > </ListView> <edittext android:id= "@+id/sfa_txtfilename" Android: Layout_width= "Match_parent" android:layout_height= "Wrap_content" android:ems= "ten" android:text= "file.txt" > <linearlayout android:layout_width= "match_parent" android:layout_height= "Wrap_content" Andro id:orientation= "Horizontal" > <button AndrOid:id= "@+id/sfa_btnok" android:layout_width= "fill_parent" android:layout_height= "Wrap_content" Andro id:layout_weight= "1" android:text= "OK"/> <button android:id= "@+id/sfa_btncancel" Android : layout_width= "fill_parent" android:layout_height= "Wrap_content" android:layout_weight= "1" android:te

 xt= "Cancel"/> </LinearLayout> </LinearLayout> </LinearLayout>

Savefileactivity.java

Package com.example.androidfiledialogs;
Import Java.io.File;

Import java.util.ArrayList;

Import java.util.Collections;


Import Java.util.Comparator;

Import android.app.Activity;

Import android.content.Intent;

Import Android.os.Bundle;

Import android.os.Environment;

Import Android.view.Menu;

Import Android.view.MenuItem;

Import Android.view.View;

Import Android.view.View.OnClickListener;

Import Android.widget.AdapterView;

Import Android.widget.ArrayAdapter;

Import Android.widget.Button;

Import Android.widget.EditText;

Import Android.widget.ListView;

Import Android.widget.Toast;


Import Android.widget.AdapterView.OnItemClickListener; 

    

    public class Savefileactivity extends activity implements Onclicklistener, Onitemclicklistener {ListView lvlist;

    

    arraylist<string> ListItems = new arraylist<string> ();

    

    Arrayadapter<string> adapter;

    

    EditText Txtfilename;

    Button Btnok;

    

    Button Btncancel;String currentpath = null;

    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);

    

    Setcontentview (R.layout.activity_save_file);

      try {/* initializing Widgets */lvlist = (ListView) Findviewbyid (r.id.sfa_lvlist);

      Txtfilename = (edittext) Findviewbyid (r.id.sfa_txtfilename);

      Btnok = (Button) Findviewbyid (R.id.sfa_btnok);

      

      Btncancel = (Button) Findviewbyid (r.id.sfa_btncancel);

      

      /* Initializing Event Handlers * * Lvlist.setonitemclicklistener (this);

      Btnok.setonclicklistener (this);

      

      Btncancel.setonclicklistener (this);

    Setcurrentpath (Environment.getexternalstoragedirectory (). GetAbsolutePath () + "/");

          The catch (Exception ex) {Toast.maketext (this, "Error in Savefileactivity.oncreate:" + ex.getmessage (),

    Toast.length_short). Show (); } void Setcurrentpath (StRing path) {arraylist<string> folders = new arraylist<string> ();

    

    arraylist<string> files = new arraylist<string> ();

    

    Currentpath = path;

    

    File Allentries = new file (path). Listfiles (); for (int i = 0; i < allentries.length i++) {if (Allentries.isdirectory ()) {Folders.Add (allentries.ge

      Tname ());

      else if (Allentries.isfile ()) {Files.add (Allentries.getname ()); } collections.sort (folders, new Comparator<string> () {@Override public int compare (

      String s1, string s2) {return s1.comparetoignorecase (S2);

    

    }

    }); Collections.sort (Files, new comparator<string> () {@Override public int compare (string s1, string s2)

      {return s1.comparetoignorecase (S2);

    

    }

    });

    

    Listitems.clear (); for (int i = 0; i < folders.size (); i++) {Listitems.add (FOLDERS.GET (i) + "/");

    for (int i = 0; i < files.size (); i++) {Listitems.add (Files.get (i)); } adapter = new Arrayadapter<string> (this, Android.

    R.layout.simple_list_item_1, ListItems);

    

    Adapter.notifydatasetchanged ();

  Lvlist.setadapter (adapter); @Override public void onbackpressed () {if!currentpath.equals (environment.getexternalstoragedirector

    Y (). GetAbsolutePath () + "/") {Setcurrentpath (new File (Currentpath). GetParent () + "/");

    else {super.onbackpressed ();

    

    @Override public void OnClick (View v) {Intent Intent;

      Switch (V.getid ()) {Case r.id.sfa_btnok:intent = new Intent ();

      Intent.putextra ("FileName", Currentpath + Txtfilename.gettext (). toString ());

      Intent.putextra ("ShortFileName", Txtfilename.gettext (). toString ());

      

      Setresult (RESULT_OK, intent);

      

  This.finish ();    Break

      Case r.id.sfa_btncancel:intent = new Intent ();

      Intent.putextra ("FileName", "");

      Intent.putextra ("ShortFileName", "");

      

      Setresult (result_canceled, intent);

      

      This.finish ();

    Break

    @Override public void Onitemclick (adapterview<?> parent, view view, int position, long ID) {

    String entryname = (string) parent.getitematposition (position);

    if (Entryname.endswith ("/")) {Setcurrentpath (Currentpath + entryname); else {this.settitle (This.getresources (). getString (R.string.title_activity_open_file) + "<span>[

      

      </span> "+ EntryName +"]);

    Txtfilename.settext (EntryName);

 }

  }

}

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