Go: two ways to respond to button in Android
Last Update:2015-07-11
Source: Internet
Author: User
<span id="Label3"></p><p><p><strong>1.</strong></p></p> <p><p><strong>Add a listener name to the button in the layout file</strong></p></p> <p><p><strong>android:onclick= "buttononclick"</strong></p></p> <p><p><strong>For example:</strong></p></p> <p><p><button</p></p> <p><p>android:id=<em>"@+id/button2"</em></p></p> <p><p>Android:layout_width=<em>"wrap_content"</em></p></p> <p><p>android:layout_height=<em>"wrap_content"</em></p></p> <p><p>android:layout_alignright=<em>"@+id/button1"</em></p></p> <p><p>android:layout_below=<em>"@+id/textview2"</em></p></p> <p><p>android:layout_margintop=<em>"28dp"</em></p></p> <p><p><u>android:text=<em>"button"</em></u></p></p> <p><p>android:onclick=<em>"buttononclick" </em>/><strong></strong></p></p> <p><p><strong></strong></p></p> <p><p><strong>function to create a response in activity</strong></p></p> <p><p><strong>publicvoid</strong> Buttononclick (view view) {</p></p> <p><p>Mytext1.settext ("hello!"); /set the display of the document</p></p> <p><p>}</p></p> <p><p><strong>2.</strong></p></p> <p><p><strong>Write in the OnCreate function</strong></p></p> <p><p><strong>Mybutton = (Button) Findviewbyid (r.id. <em> Button1</em>);</strong></p></p> <p><p>Mybutton.setonclicklistener (<strong>new</strong> onclicklistener () {</p></p> <p><p>@Override</p></p> <p><p><strong>publicvoid</strong> OnClick (View v) {</p></p> <p><p><strong>TODO</strong> auto-generated Method stub</p></p> <p><p>Mytext.settext ("hello!"); /set the display of the document</p></p> <p><p>}</p></p> <p><p>});</p></p> <p><p>3. <strong>write in the OnCreate function</strong></p></p> <p><p>Findviewbyid (r.id. <em> Btn_title_popmenu</em>). setonclicklistener (<strong></strong>this);</p></p> <p><p>Findviewbyid (r.id. <em> Button1</em>). Setonclicklistener (<strong></strong>this);</p></p> <p><p>Again</p></p> <p><p><strong>publicvoid</strong> OnClick (View v) {</p></p> <p><p><strong>if</strong> (v.getid () = = R.id. <em>Btn_title_popmenu</em>) {</p></p> <p><p>Popmenu.showasdropdown (v);</p></p> <p><p>}<strong>ElseIf</strong>(v.getid () ==r.id. <em> Button1</em>)</p></p> <p><p>{</p></p> <p><p>Popmenu1.showasdropdown (v);</p></p> <p><p>}</p></p> <p><p>}</p></p> <p><p>The Prerequisites are:</p></p> <p><p><strong></strong> public <strong>class</strong> Mainactivity <strong>extends</strong> Activity <strong>implements</strong> onclicklistener{}</p></p> <p><p>An example of the third method:</p></p> <p><p><strong>Publicclass</strong> Mainactivity <strong>extends</strong> Activity <strong>implements</strong> onclicklistener{</p></p> <p><p><strong>Private</strong> TextView Mytext = <strong>null</strong>;</p></p> <p><p><strong>Private</strong> TextView MYTEXT1 = <strong>null</strong>;</p></p> <p><p>@Override</p></p> <p><p>Run when activity is run for the first time</p></p> <p><p><strong>protectedvoid</strong> onCreate (Bundle Savedinstancestate) {</p></p> <p><p><strong>Super</strong>. OnCreate (savedinstancestate);</p></p> <p><p>Setcontentview (r.layout. <em> Activity_main</em>);//set The control to be displayed</p></p> <p><p>Findviewbyid (r.id. <em> Button1</em>). Setonclicklistener (<strong></strong>this);</p></p> <p><p>Findviewbyid (r.id. <em> Button2</em>). setonclicklistener (<strong></strong>this);</p></p> <p><p>Mytext = (TextView) Findviewbyid (r.id. <em> TextView1</em>);</p></p> <p><p>Mytext1 = (TextView) Findviewbyid (r.id. <em> TextView2</em>);</p></p> <p><p>}</p></p> <p><p>@Override</p></p> <p><p><strong>publicvoid</strong> OnClick (View arg0) {</p></p> <p><p><strong>TODO</strong> auto-generated method stubs</p></p> <p><p><strong>if</strong> (arg0.getid () ==r.id. <em>button1</em>) {</p></p> <p><p>Mytext.settext ("hello!"); /set the display of the document</p></p> <p><p>}</p></p> <p><p><strong>ElseIf</strong> (arg0.getid () ==r.id. <em>button2</em>) {</p></p> <p><p>Mytext1.settext ("hello!"); /set the display of the document</p></p> <p><p>}</p></p> <p><p>}</p></p> <p><p>Examples of the first two methods:</p></p> <p><p><strong>public class Mainactivity extends Activity {</strong></p></p> <p><p><strong>Private Button Mybutton = null;</strong></p></p> <p><p><strong>Private Button Mybutton1 = null;</strong></p></p> <p><p><strong>Private TextView Mytext = null;</strong></p></p> <p><p><strong>Private TextView Mytext1 = null;</strong></p></p> <p><p><strong>@Override</strong></p></p> <p><p><strong>Run when activity is run for the first time</strong></p></p> <p><p><strong>protected void OnCreate (Bundle Savedinstancestate) {</strong></p></p> <p><p><strong>Super.oncreate (savedinstancestate);</strong></p></p> <p><p><strong>Setcontentview (r.layout.activity_main);//set the control to display</strong></p></p> <p><p><strong>Mybutton = (Button) Findviewbyid (r.id.button1);</strong></p></p> <p><p><strong>Mytext = (TextView) Findviewbyid (r.id.textview1);</strong></p></p> <p><p><strong>Mytext1 = (TextView) Findviewbyid (r.id.textview2);</strong></p></p> <p><p><strong>The second method of</strong></p></p> <p><p><strong>Mybutton.setonclicklistener (new Onclicklistener () {</strong></p></p> <p><p><strong>@Override</strong></p></p> <p><p><strong>public void OnClick (View V) {</strong></p></p> <p><p><strong>TODO auto-generated Method Stub</strong></p></p> <p><p><strong>Mytext.settext ("hello!"); /set the display of the document</strong></p></p> <p><p><strong>}</strong></p></p> <p><p><strong>});</strong></p></p> <p><p><strong>}</strong></p></p> <p><p><strong>The first of these methods</strong></p></p> <p><p><strong>public void Button2onclick (view View) {</strong></p></p> <p><p><strong>Mytext1.settext ("hello!"); /set the display of the document</strong></p></p> <p><p><strong>}</strong></p></p> <p><p><strong>//first method to set</strong> android:onclick=<em>"buttononclick"</em> in the Button's layout file</p></p><p><p>Go: two ways to respond to button in Android</p></p></span>
