35.Android with the Delete button EditText learning

Today implements the EditText with the delete function in Android, the effect is as follows:

When you enter content, EditText changes to an edit box with a Delete function button.

Implementation code is very simple, directly on the code,

Layout file xml:

1 <?XML version= "1.0" encoding= "Utf-8"?>2 <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Android:layout_width= "Match_parent"4 Android:layout_height= "Match_parent"5 Android:background= "#000000"6 android:orientation= "vertical" >7 8     <LinearLayout9         Android:layout_width= "Match_parent"Ten Android:layout_height= "Wrap_content" One Android:background= "@drawable/back"  A Android:layout_marginbottom= "5DP" - Android:layout_marginleft= "5DP" - Android:layout_marginright= "5DP" the Android:layout_margintop= "5DP" > -  -         <ImageView -             Android:id= "@+id/search_img" + Android:layout_width= "Wrap_content" - Android:layout_height= "Wrap_content" + Android:paddingtop= "7DP" A android:src= "@drawable/search" /> at  -         <EditText -             Android:id= "@+id/cleartext" - Android:layout_width= "Fill_parent" - Android:layout_height= "Wrap_content" - Android:layout_weight= "1" in Android:background= "@null" - Android:hint= "Search" to android:imeoptions= "Actiondone" + Android:singleline= "true" > -         </EditText> the  *         <Button $             Android:id= "@+id/clear_btn"Panax Notoginseng Android:layout_width= "40DP" - Android:layout_height= "40DP" the Android:background= "@drawable/clear" /> +     </LinearLayout> A  the </LinearLayout>

Activity code:

1  PackageCom.example.cleartextdemo;2 3 Importandroid.app.Activity;4 ImportAndroid.os.Bundle;5 Importandroid.text.Editable;6 ImportAndroid.text.TextWatcher;7 ImportAndroid.view.View;8 ImportAndroid.widget.Button;9 ImportAndroid.widget.EditText;Ten  One  Public classMainactivityextendsActivity { A  -     PrivateEditText Clearedittext; -     PrivateButton clearbtn; the  - @Override -     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); + Setcontentview (r.layout.activity_main); -  +Clearedittext =(EditText) Findviewbyid (r.id.cleartext); ACLEARBTN =(Button) Findviewbyid (R.ID.CLEAR_BTN); atClearbtn.setonclicklistener (NewView.onclicklistener () { - @Override -              Public voidOnClick (View v) { -Clearedittext.settext (""); -             } -         }); in  - Clearedittext.addtextchangedlistener (mtextwatcher); to  +     } -  theTextwatcher Mtextwatcher =NewTextwatcher () { *  $ @OverridePanax Notoginseng          Public voidBeforetextchanged (Charsequence S,intStartintCount, -                 intAfter ) { the             //TODO auto-generated Method Stub +  A         } the  + @Override -          Public voidOnTextChanged (Charsequence S,intStartintbefore, $                 intcount) { $             //TODO auto-generated Method Stub -  -         } the  - @OverrideWuyi          Public voidaftertextchanged (Editable s) { the             if(Clearedittext.gettext (). toString ()! =NULL -&&!clearedittext.gettext (). toString (). Equals ("")) { Wu clearbtn.setvisibility (view.visible); -}Else { About clearbtn.setvisibility (view.invisible); $             } -  -         } -  A     }; +  the}

Post-run input information

Pressing the Delete control changes to:

35.Android with the Delete button EditText learning