4th-android UI Action-button
Last Update:2016-02-18
Source: Internet
Author: User
<span id="Label3"></p><p><p>The Button class provides control button functionality, the button class belongs to the Android.wiget package and inherits the Android.widget.TextView class, and the button class provides methods and properties for manipulating control buttons.</p></p><p><p>Common methods and Functions:</p></p> <table style="height: 155px; width: 475px;" border="0" align="left"> <tbody> <tr> <td>Method</td> <td>Function description</td> </tr> <tr> <td>Button</td> <td>How to construct a button class</td> </tr> <tr> <td>Setonkeylistener</td> <td>Set Key monitoring</td> </tr> <tr> <td>Onkeylongpress</td> <td>The method is called when the user holds the key</td> </tr> <tr> <td>OnKeyUp</td> <td>This method is called when the user key is Bounced.</td> </tr> <tr> <td>Onkeymultiple</td> <td>When the user presses the key multiple times, the method is called</td> </tr> <tr> <td>OnKeyDown</td> <td>When the user presses the key, the method is called</td> </tr> </tbody> </table><p><p></p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p>Properties of the button tag (modified and set in XML)</p></p> <table style="height: 209px; width: 908px;" border="0" align="left"> <tbody> <tr> <td>Property name</td> <td>Describe</td> </tr> <tr> <td>Android:layout_height</td> <td>Set control height, Optional value (fill_parent/warp_contect/px Value)</td> </tr> <tr> <td>Android:layout_weight</td> <td>Set control width, Optional value (fill_parent/warp_contect/px Value)</td> </tr> <tr> <td>Android:text</td> <td>Set control name, Optional value (any String)</td> </tr> <tr> <td>Android:layout_gravity</td> <td>Set the position of the control in the layout, optional values (top/bottom/left/right/center_verticle/fill_verticle/fill_horizontal/center/fill/cilp_verticle)</td> </tr> <tr> <td>Android:layout_weight</td> <td>Set the weight of the control in the layout, optional values (any number)</td> </tr> <tr> <td>Android:textcolor</td> <td>Set text color, optional value (any color value, such as 0xFFFFFFFF)</td> </tr> <tr> <td>Android:buffertype</td> <td>Set the obtained text category, optional value (normal/spannable/editable)</td> </tr> <tr> <td>Android:hint</td> <td>Set the characters that appear when text is empty, optional values (any string such as "click Button")</td> </tr> </tbody> </table><p><p></p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p>Specific examples Show:</p></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span> <span style="color: #000000;"><span style="color: #000000;">ackage com.example.hello2;</span></span><span style="color: #008080;"><span style="color: #008080;">2</span></span> <span style="color: #008080;"><span style="color: #008080;">3</span></span> <span style="color: #000000;"><span style="color: #000000;">Import android.support.v7.app.ActionBarActivity;</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span> <span style="color: #000000;"><span style="color: #000000;">Import android.os.Bundle;</span></span><span style="color: #008080;"><span style="color: #008080;">5</span></span> <span style="color: #000000;"><span style="color: #000000;">Import android.view.Menu;</span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span> <span style="color: #000000;"><span style="color: #000000;">Import android.view.MenuItem;</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span> <span style="color: #000000;"><span style="color: #000000;">Import android.widget.TextView;</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span> <strong><strong><span style="color: #000000;"> <span style="background-color: #ff0000;">import Android.view.View</span>;</span></strong></strong><span style="color: #008080;"><span style="color: #008080;">9</span></span> <span style="color: #000000;"><span style="color: #000000;"> <span style="background-color: #ff0000;"><strong>import Android.widget.Button</strong></span>;</span></span><span style="color: #008080;"><span style="color: #008080;">Ten</span></span> <span style="color: #008080;"><span style="color: #008080;"></span> one</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span><span style="color: #000000;"><span style="color: #000000;">Mainactivity extends Actionbaractivity {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #0000ff;"><span style="color: #0000ff;">Private</span></span><span style="color: #000000;"><span style="color: #000000;">TextView mytextview;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff; background-color: #ff0000;"><span style="color: #0000ff; background-color: #ff0000;">Private</span></span><span style="color: #000000;"><span style="color: #000000;"> <span style="background-color: #ff0000;">Button mButton1</span>;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #0000ff;"><span style="color: #0000ff;">protected</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">onCreate (Bundle Savedinstancestate) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;">super.oncreate (savedinstancestate);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;">Setcontentview (r.layout.activity_main);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="background-color: #ff0000;"><span style="background-color: #ff0000;">mbutton1=</span></span><span style="color: #000000;"><span style="color: #000000;"> <span style="background-color: #ff0000;">(Button) Findviewbyid (r.id.mybutton1)</span>;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>mytextview=<span style="color: #000000;"><span style="color: #000000;">(TextView) Findviewbyid (r.id.mytextview);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="background-color: #ff0000;"><span style="background-color: #ff0000;">Mbutton1.setonclicklistener (<span style="color: #0000ff;">new</span> <span style="color: #000000;"> button.onclicklistener ()</span> </span></span><span style="color: #008080;"><span style="color: #008080;"></span> at</span> <span style="color: #000000;"><span style="color: #000000;"> {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">OnClick (View V)</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Mytextview.settext (<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">hi,everyone!!</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> in</span> <span style="color: #000000;"><span style="color: #000000;"> });</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> to</span> <span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span><span style="color: #000000;"><span style="color: #000000;">Boolean Oncreateoptionsmenu (menu menu) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Inflate the menu; this adds items to the action bar if it is Present.</span></span><span style="color: #008080;"><span style="color: #008080;"></span> *</span> <span style="color: #000000;"><span style="color: #000000;">getmenuinflater (). Inflate (r.menu.main, menu);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> $</span> <span style="color: #0000ff;"><span style="color: #0000ff;">return</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">true</span></span><span style="color: #000000;"><span style="color: #000000;">;</span></span><span style="color: #008080;"><span style="color: #008080;">Panax Notoginseng</span></span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span><span style="color: #000000;"><span style="color: #000000;">Boolean onoptionsitemselected (MenuItem Item) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Handle Action Bar Item clicks Here. The Action Bar</span> would</span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">automatically handle clicks on the Home/up button, so long</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;">As you <span style="color: #008000;">specify a the parent activity in Androidmanifest.xml.</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span>ID =<span style="color: #000000;"><span style="color: #000000;">Item.getitemid ();</span></span><span style="color: #008080;"><span style="color: #008080;"></span> $</span> <span style="color: #0000ff;"><span style="color: #0000ff;">if</span></span>(id = =<span style="color: #000000;"><span style="color: #000000;">R.id.action_settings) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> $</span> <span style="color: #0000ff;"><span style="color: #0000ff;">return</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">true</span></span><span style="color: #000000;"><span style="color: #000000;">;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;">return</span></span><span style="color: #000000;"><span style="color: #000000;">super.onoptionsitemselected (item);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>}</pre><p><p>Add the above code in the Java main program.</p></p><p><p>In the XML also to make the corresponding changes, it is necessary to mention, layout provides a visual layout, you can manually adjust the location (the code will be automatically modified in the xml).</p></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span><relativelayout xmlns:android=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">http://schemas.android.com/apk/res/android</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">2</span></span>xmlns:tools=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">Http://schemas.android.com/tools</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">3</span></span>Android:layout_width=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">match_parent</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span>android:layout_height=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">match_parent</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">5</span></span>Android:paddingbottom=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@dimen/activity_vertical_margin</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span>android:paddingleft=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@dimen/activity_horizontal_margin</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span>android:paddingright=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@dimen/activity_horizontal_margin</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span>android:paddingtop=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@dimen/activity_vertical_margin</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;">9</span></span>tools:context=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">com.example.hello2.MainActivity</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>><span style="color: #008080;"><span style="color: #008080;">Ten</span></span> <span style="color: #008080;"><span style="color: #008080;"></span> one</span><<span style="color: #000000;"><span style="color: #000000;">TextView</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span>Android:id=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@+id/mytextview</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Android:layout_width=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">wrap_content</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>android:layout_height=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">wrap_content</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span>android:text=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@string/hello</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>/><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008080;"><span style="color: #008080;"></span> -</span><<span style="color: #000000;"><span style="color: #000000;">Button</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Android:id=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@+id/mybutton1</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span>Android:layout_width=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">wrap_content</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>android:layout_height=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">wrap_content</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span>android:layout_alignleft=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@+id/mytextview</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span>android:layout_below=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">@+id/mytextview</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> at</span>android:layout_margintop=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">14DP</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>android:text=<span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #800000;"><span style="color: #800000;">Click</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>/><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008080;"><span style="color: #008080;"></span> -</span></RelativeLayout></pre><p><p>To add a Button's property setting</p></p><p><p>Final Effect:</p></p><p><p></p></p><p><p>After Clicking:</p></p><p><p></p></p><p><p>4th-android UI Action-button</p></p></span>
