Android Development Note ___ Image button __imagebutton

IMAGEBUTTON

It is actually derived from the image view, not derived from the button. , image view has properties and methods that are owned by the image button, except that ImageButton has a default button appearance.

• Image button can only display graphics
• ImageButton the picture above can be stretched proportionally
• Only one graphic can be displayed in the background, but two pictures are displayed in the foreground and background, and the effect of picture overlay is achieved.

• In the input method cannot enter the character and the special font display string, is suitable uses ImageButton, first transduction again displays

• To place a picture around text, you can use a button that is based on the text view,
• The following properties are set specifically in XML:
  • Drawabletop: Specify a picture above the text
  • Drawablebottom: Specify a picture below the text
  • Drawableleft: Specifies the graphic to the left of the text
  • Drawableright: Specifies the picture to the right of the text
  • Drawablepadding: Specify graphic text spacing
• In the code:
  • Setcompounddrawables: Set the text around the graphic, up or down
  • Setcompounddrawablepadding: Pitch

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:orientation= "vertical">6 7     <Button8         Android:id= "@+id/btn_icon"9 Android:layout_width= "Wrap_content"Ten Android:layout_height= "Wrap_content" One Android:layout_margintop= "10DP" A android:layout_gravity= "Center" - Android:drawableleft= "@mipmap/ic_launcher" - android:drawablepadding= "5DP" the Android:text= "Warm welcome" - Android:textcolor= "#000000" - android:textsize= "17SP" /> -  +     <LinearLayout -         Android:layout_width= "Match_parent" + Android:layout_height= "Wrap_content" A Android:layout_margintop= "10DP" at android:orientation= "Horizontal"> -  -         <Button -             Android:id= "@+id/btn_left" - Android:layout_width= "0DP" - Android:layout_height= "Wrap_content" in Android:layout_weight= "1" - Android:text= "icon in left" to Android:textcolor= "#000000" + android:textsize= "15SP" /> -  the         <Button *             Android:id= "@+id/btn_top" $ Android:layout_width= "0DP"Panax Notoginseng Android:layout_height= "Wrap_content" - Android:layout_weight= "1" the Android:text= "icon on top" + Android:textcolor= "#000000" A android:textsize= "15SP" /> the  +         <Button -             Android:id= "@+id/btn_right" $ Android:layout_width= "0DP" $ Android:layout_height= "Wrap_content" - Android:layout_weight= "1" - Android:text= "icon in right" the Android:textcolor= "#000000" - android:textsize= "15SP" />Wuyi  the         <Button -             Android:id= "@+id/btn_bottom" Wu Android:layout_width= "0DP" - Android:layout_height= "Wrap_content" About Android:layout_weight= "1" $ Android:text= "icon in the bottom" - Android:textcolor= "#000000" - android:textsize= "15SP" /> -  A     </LinearLayout> +  the </LinearLayout>

Java

1  PackageCom.example.alimjan.hello_world;2 3 ImportAndroid.content.Context;4 Importandroid.content.Intent;5 Importandroid.graphics.drawable.Drawable;6 ImportAndroid.os.Bundle;7 Importandroid.support.v7.app.AppCompatActivity;8 ImportAndroid.view.View;9 ImportAndroid.widget.Button;Ten  One /** A * Created by Alimjan on 7/1/2017. -  */ -  the  -  Public classClass__2_3_4extendsAppcompatactivityImplementsView.onclicklistener { -     PrivateButton Btn_icon; -     Privatedrawable drawable; +  - @Override +     protected voidonCreate (Bundle savedinstancestate) { A         Super. OnCreate (savedinstancestate); at Setcontentview (r.layout.code_2_3_4); -Btn_icon =(Button) Findviewbyid (R.id.btn_icon); -drawable =getresources (). getdrawable (R.mipmap.ic_launcher); -         //the picture size must be set or the picture will not be displayed -Drawable.setbounds (0, 0, Drawable.getminimumwidth (), Drawable.getminimumheight ()); -Button Btn_left =(Button) Findviewbyid (r.id.btn_left); inButton Btn_top =(Button) Findviewbyid (r.id.btn_top); -Button btn_right =(Button) Findviewbyid (r.id.btn_right); toButton Btn_bottom =(Button) Findviewbyid (r.id.btn_bottom); +Btn_left.setonclicklistener ( This); -Btn_top.setonclicklistener ( This); theBtn_right.setonclicklistener ( This); *Btn_bottom.setonclicklistener ( This); $     }Panax Notoginseng  - @Override the      Public voidOnClick (View v) { +         if(V.getid () = =r.id.btn_left) { ABtn_icon.setcompounddrawables (drawable,NULL,NULL,NULL); the}Else if(V.getid () = =r.id.btn_top) { +Btn_icon.setcompounddrawables (NULL, Drawable,NULL,NULL); -}Else if(V.getid () = =r.id.btn_right) { $Btn_icon.setcompounddrawables (NULL,NULL, Drawable,NULL); $}Else if(V.getid () = =R.id.btn_bottom) { -Btn_icon.setcompounddrawables (NULL,NULL,NULL, drawable); -         } the     } - Wuyi      Public Static voidstarthome (Context mcontext) { theIntent Intent =NewIntent (Mcontext, Class__2_3_4.class); - mcontext.startactivity (intent); Wu     } -}

Android Development Note ___ Image button __imagebutton