Android Display directory under picture

Knowledge points

1. Grid view

2. Reading files

Mainacitvity

 PackageCom.test.gridview;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.os.Bundle;ImportAndroid.view.View;ImportAndroid.widget.AdapterView;ImportAndroid.widget.GridView;ImportAndroid.widget.Toast; Public classMainactivityextendsappcompatactivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); GridView GridView=(GridView) Findviewbyid (R.id.gridview); Gridview.setadapter (NewImageadapter ( This)); Gridview.setonitemclicklistener (NewAdapterview.onitemclicklistener () { Public voidOnitemclick (adapterview<?>Parent, View V,intPositionLongID) {toast.maketext (mainactivity. This, "" +position, Toast.length_short). Show ();    }        }); }}

View Code

Imageadapter

 PackageCom.test.gridview;ImportAndroid.content.Context;ImportAndroid.graphics.Bitmap;Importandroid.graphics.BitmapFactory;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.widget.BaseAdapter;ImportAndroid.widget.GridView;ImportAndroid.widget.ImageView;Importjava.util.List;ImportJava.util.Map;/*** Created by 1 on 2016/4/17.*/ Public classImageadapterextendsBaseadapter {PrivateContext Mcontext;  PublicImageadapter (Context c) {Mcontext=C; }     Public intGetCount () {returnimagepath.size (); }     PublicObject GetItem (intposition) {        return NULL; }     Public LongGetitemid (intposition) {        return0; }    //Create a new ImageView for each item referenced by the Adapter     PublicView GetView (intposition, View Convertview, ViewGroup parent)        {ImageView ImageView; if(Convertview = =NULL) {            //if it ' s not recycled, initialize some attributesImageView =NewImageView (Mcontext); Imageview.setlayoutparams (NewGridview.layoutparams (85, 85));            Imageview.setscaletype (ImageView.ScaleType.CENTER_CROP); Imageview.setpadding (8, 8, 8, 8); } Else{ImageView=(ImageView) Convertview; } Bitmap Bitmap=Bitmapfactory.decodefile (imagepath.get (position). Get (Fileutils.image_path));        Imageview.setimagebitmap (bitmap); returnImageView; }    Privatelist<map<string, string>> ImagePath =fileutils.getfiles (Fileutils.sdpath);}

View Code

FileUtils

 PackageCom.test.gridview;Importandroid.os.Environment;ImportJava.io.File;Importjava.util.ArrayList;ImportJava.util.HashMap;Importjava.util.List;ImportJava.util.Map;/*** Created by 1 on 2016/4/17.*/ Public classFileUtils { Public StaticString[] Imageformatset = {"JPG", "png", "GIF"};  Public StaticString Sdpath = environment.getexternalstoragedirectory () + "/00meeting/";  Public StaticString image_name = "ImageName";  Public StaticString image_path = "ImagePath"; /*** Determine if it is a picture file * *@paramPath *@return     */     Public Static Booleanisimagefile (String path) { for(String format:imageformatset) {if(Path.endswith (format)) {return true; }        }        return false; }     Public StaticList<map<string, string>>getFiles (String path) {List<map<string, string>> pathList =NewArraylist<>(); File File=NewFile (path); file[] Files=File.listfiles ();  for(File f:files) {if(F.isdirectory ()) {GetFiles (F.getabsolutepath ()); } Else {                if(Isimagefile (F.getpath ())) {Map<string, string> map =NewHashmap<>();                    Map.put (Fileutils.image_name, F.getname ());                    Map.put (Fileutils.image_path, F.getpath ());                Pathlist.add (map); }            }        }        returnpathList; }}

View Code

Android Display Directory slice