Android ListView Usage

Write a simple example to illustrate the use of the ListView: Given a word, there are four meanings below, to find the correct one, whether or not successful, will jump to the next word;
The main uses of knowledge are: Findviewbyid (), ListView, Adapterview, Anonymous inner class, ArrayList some usage:

The following main look at the code, the code inside the comment is very detailed, will not be too much to repeat:
Xml:

1 <?XML version= "1.0" encoding= "Utf-8"?>2 <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Xmlns:tools= "Http://schemas.android.com/tools"4 Android:layout_width= "Match_parent"5 Android:layout_height= "Match_parent"6 android:orientation= "vertical">7 8     <TextView9         Android:layout_width= "Wrap_content"Ten Android:layout_height= "Wrap_content" One Android:id= "@+id/wordtextview" A Android:text= "word" - android:textsize= "26DP" - android:layout_gravity= "Center"/> the     <ListView -         Android:layout_width= "Match_parent" - Android:layout_height= "Match_parent" - Android:id= "@+id/definitions_listview"> +  -     </ListView> +  A </LinearLayout>

Java files:

Setonitemclicklistener This is the monitor method of the ListView;

1  PackageCom.chenye.dictionarychange;2 3 Importandroid.support.v7.app.AppCompatActivity;4 ImportAndroid.os.Bundle;5 ImportAndroid.view.View;6 ImportAndroid.widget.AdapterView;7 ImportAndroid.widget.ArrayAdapter;8 ImportAndroid.widget.ListView;9 ImportAndroid.widget.TextView;Ten ImportAndroid.widget.Toast; One  A ImportOrg.w3c.dom.Text; -  - Importjava.util.ArrayList; the Importjava.util.Collection; - Importjava.util.Collections; - ImportJava.util.HashMap; - ImportJava.util.Scanner; +  -  Public classMainactivityextendsappcompatactivity { +  A     PrivateHashmap<string, String> dictionary;//A dictionary that stores words-meaning of words at     PrivateArraylist<string> chosenwords;//Store all the words in Chosenwords -     PrivateString Word;//Word -     PrivateArraylist<string> definations;//meaning list -     PrivateArrayadapter<string>adapter; -  - @Override in     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); to Setcontentview (r.layout.activity_main); + readalldefination (); -          This. Chosenwords =NewArraylist<> ( This. Dictionary.keyset ());//get all the words and exist in ArrayList the          This. definations =NewArraylist<>(); *          This. adapter =NewArrayadapter<> ( ThisAndroid. R.layout.simple_list_item_1, This. definations);//Initialize Arrayadapter $         //randomly select 5 words meaningPanax Notoginseng pick4definations (); -         //Add a list to adapter theListView Defnlistview =Findviewbyid (r.id.definitions_listview); +Defnlistview.setadapter ( This. adapter); A         //listen to this list and use the anonymous inner class the        Defnlistview.setonitemclicklistener (New Adapterview.onitemclicklistener () { + @Override -              Public voidOnitemclick (adapterview<?> adapterview, view view,intILongl) { $ListView Defnlistview =Findviewbyid (r.id.definitions_listview); $String Choosedefntext = defnlistview.getitematposition (i). toString ();//get the click position of the string, I is the position of the list, in most cases I and L (List of the first few lines) is the same -String correctdefn = mainactivity. This. Dictionary.get (Word);//get an explanation of the corresponding word -                 //If the selection is consistent with the correct result: the                 if(Correctdefn.equals (Choosedefntext)) { -Toast.maketext (mainactivity. This, "Correct", Toast.length_short). Show ();Wuyi}Else{ theToast.maketext (mainactivity. This, "wrong", Toast.length_short). Show (); -                 } Wu                 //after selecting the list again after re-refreshing, that is to pick a word again and the meaning of 5 words - pick4definations (); About  $             } -         }); -     } -      Public voidpick4definations () { A  +Collections.shuffle ( This. chosenwords);//disrupt the placement of words the          This. Word = This. Chosenwords.get (0);//gets the first word in the list that holds the word -TextView Wordtext =Findviewbyid (r.id.wordtextview); $Wordtext.settext ( This. Word);//Show Words the          This. Definations.clear ();//prevent results from having dirty data, clear the list of word meanings the          for(inti = 0; I < 4; i++){ theString defn = This. Dictionary.get ( This. Chosenwords.get (i));//get to the meaning of the word the              This. Definations.add (defn); -         } inCollections.shuffle ( This. definations);//Disrupt Results the          This. adapter.notifydatasetchanged ();//Notify Adpter Change the     } About     //put all the words and their meanings in the Dictionary of Dictionary the     Private voidreadalldefination () { theScanner Scanner =NewScanner (Getresources (). Openrawresource (R.raw.gre_words)); the         if( This. Dictionary = =NULL){ +              This. Dictionary =NewHashmap<>(); -         } the          while(Scanner.hasnext ()) {BayiString line =scanner.nextline (); thestring[] spiece = line.split ("\ t"); the              This. Dictionary.put (Spiece[0], spiece[1]); -         } -     } the}

Android ListView Usage