Click button through code

1. The effects of custom states can be implemented through code or styles defined in XML.

2. The following describes the code implementation and uses statelistdrawable to define the button background.

3. Because the pressed_enabled_state_set value in the View class is not a public constant, it is accessed through inheritance.

Note: The effects of other controls, such as imageview, can also be achieved through this method. However, because imageview does not have focus by default and cannot be clicked, you need to change it by yourself (you need to click to set Android: clickable = "true", you need to be able to select and set Android: focusable = "true ").

Java code:

01 package COM. test. testbutton; 02 03 import android. app. activity; 04 import android. content. context; 05 import android. graphics. drawable. drawable; 06 import android. graphics. drawable. statelistdrawable; 07 import android. OS. bundle; 08 import android. view. view; 09 import android. widget. button; 10 11 public class testbutton extends activity {12 @ override13 public void oncreate (bundle savedinstancestate) {14 super. onc Reate (savedinstancestate); 15 setcontentview (R. layout. main); 16 integer [] mbuttonstate = {R. drawable. defaultbutton, 17 R. drawable. focusedpressed, R. drawable. pressed}; 18 button mbutton = (button) findviewbyid (R. id. button); 19 mybutton = new mybutton (this); 20 mbutton. setbackgrounddrawable (mybutton. setbg (mbuttonstate); 21} 22 23 class mybutton extends view {24 25 public mybutton (context contex T) {26 super (context); 27} 28 29 // The following method can also pass your image array and set the image status with statelistdrawable, to display the states of the buttons. 30 // not selected, press to select the effect. 31 public statelistdrawable setbg (integer [] mimageids) {32 statelistdrawable BG = new statelistdrawable (); 33 drawable normal = This. getresources (). getdrawable (mimageids [0]); 34 drawable selected = This. getresources (). getdrawable (mimageids [1]); 35 drawable pressed = This. getresources (). getdrawable (mimageids [2]); 36 BG. addstate (view. pressed_enabled_state_set, pressed); 37 BG. addstate (view. enabled_focused_state_set, selected); 38 BG. addstate (view. enabled_state_set, normal); 39 BG. addstate (view. focused_state_set, selected); 40 BG. addstate (view. empty_state_set, normal); 41 return BG; 42} 43} 44}

Main. xml

01<?xml version=”1.0″ encoding=”utf-8″?>02<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android”03        android:orientation=”vertical”04        android:layout_width=”fill_parent”05        android:layout_height=”fill_parent”06        >07    <Button android:id=”@+id/btn”08            android:layout_width=”wrap_content”09            android:layout_height=”wrap_content”10            android:text=”@string/mybtn”11            android:background=”@drawable/mybutton_background” />12</LinearLayout>