Four ways to click on the Android button

<span style= "font-family:arial, Helvetica, Sans-serif; Background-color:rgb (255, 255, 255); " >1) Click the Implementation class interface of the button; Disadvantages, more buttons, code redundancy;</span>

1.findViewByID ();
2.btn.setonclicklistener (New Myonclicklistener ());//interface for implementing classes;
3.class Myonclicklistener implements onclicklistener{
public void OnClick (View v) {
Toast.maketext (mainactivity, "Print ...", 0). Show ();
}
}

2), the method of implementing the class interface in the class, using the current pass this to implement the OnClick () method, and add a switch case inside to determine the button to operate;


Very many buttonsPublic class Mainactivity extends actionbaractivity implements Onclicklistener



1.findViewByID ();//Get ID
2.btn.setonclicklistener (this);//Set button listener;
3.public void OnClick (View v) {
Switch (V.getid ()) {
Case R.ID.BTN1:
Toast.maketext (This, "Print ...", 0). Show ();
}
}


3) Under the button listener directly new an anonymous inner class//This anonymous inner class can be an interface
Btn.setonclicklistener (New onclicklistener{
Public OnClick (View v) {
Toast.maketext (Mainactivity.this, "string ....", 0). Show ();
}
});


4) No need to define the ID of the button at this time only for demo example
1. Using the XML layout file
android:onclick= "haha"
2. Automatically generate a "haha" method in the Java implementation logic method
public void haha (View v) {
Toast.maketext (mainactivity.this, "input ....", 0). Show ();

}

Attach source code Mainactivity.java in Low:

Package Com.weibo.onclick;import Android.support.v7.app.actionbaractivity;import Android.support.v7.app.ActionBar ; Import Android.support.v4.app.fragment;import Android.os.bundle;import Android.view.layoutinflater;import Android.view.menu;import Android.view.menuitem;import Android.view.view;import Android.view.View.OnClickListener; Import Android.view.viewgroup;import android.widget.button;import android.widget.toast;import android.os.Build; public class Mainactivity extends Actionbaractivity implements Onclicklistener {@Override protected void onCreate (B        Undle savedinstancestate) {super.oncreate (savedinstancestate);                        Setcontentview (R.layout.fragment_main);        Button Btn_click1 = (button) Findviewbyid (R.ID.BTN_CLICK1);        Button Btn_click2 = (button) Findviewbyid (R.ID.BTN_CLICK2);        Button Btn_click3 = (button) Findviewbyid (R.ID.BTN_CLICK3);                Button Btn_click4 = (button) Findviewbyid (R.ID.BTN_CLICK4); /*//1. Inner class method Get button        Btn_click1.setonclicklistener (New Myoncliklistener ());        Btn_click2.setonclicklistener (New MyOnClikListener2 ());      Btn_click3.setonclicklistener (New MyOnClikListener3 ()); */*//2. Anonymous inner class implementation Btn_click1.setonclicklistener (new Onclicklistener () {@Overridepublic void O                Nclick (View v) {toast.maketext (Mainactivity.this, button button 1, 0). Show ();}); Btn_click2.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {Toast.maketext ( Mainactivity.this, "button button 2", 0). Show ();}});        */*//3. Use the switch method to implement Btn_click1.setonclicklistener (this);        Btn_click2.setonclicklistener (this);        Btn_click3.setonclicklistener (this); Btn_click4.setonclicklistener (this); */} Class Myoncliklistener implements onclicklistener{@Overridepubl        IC void OnClick (View v) {toast.maketext (Mainactivity.this, "press button 1", 0). Show (); } class MyOnClikListener2 implements onclicklistener{@Overridepublic void OnClick (View v) {toast.maketext (Mainactivity.this, "press button 2", 0). Show (); } class MyOnClikListener3 implements onclicklistener{@Overridepublic void OnClick (View v) {Toast.maketext (mainactiv        Ity.this, "press button 3", 0). Show (); } @Overridepublic void OnClick (View v) {switch (V.getid ()) {R.id.btn_click1:toast.maketext (this, "BT1", 0). Show (); Break;case R.id.btn_click2:toast.maketext (This, "BT2", 0). Show (); Break;case R.id.btn_click3:toast.maketext (This, " BT3 ", 0). Show (); Break;default:toast.maketext (This," Bt4 ", 0). Show ();}} public void haha (View v) {Toast.maketext (this, "haha", 0). Show ();   public void Point (View v) {Toast.maketext (this, "dot", 0). Show (); }

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Four ways to click on the Android button