Android Learning Note--button

<span id="Label3"></p><p><p>The function of the project is to implement the display of a textview and a button in the activity</p></p><p><p></p></p><p><p>The following code is the code in mainactivity</p></p><pre><span style="color: #0000ff;"><span style="color: #0000ff;"></span> package</span><span style="color: #000000;"><span style="color: #000000;">com.example.button;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.app.Activity;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.os.Bundle;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.view.Menu;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.view.MenuItem;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.widget.Button;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.widget.TextView;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span>Mainactivity<span style="color: #0000ff;"><span style="color: #0000ff;">extends</span></span><span style="color: #000000;"><span style="color: #000000;">Activity {@Override</span></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: #0000ff;"><span style="color: #0000ff;">Super</span></span><span style="color: #000000;"><span style="color: #000000;">. OnCreate (savedinstancestate); Setcontentview (r.layout.activity_main); TextView Mytextview</span></span>=<span style="color: #000000;"><span style="color: #000000;">(TextView) Findviewbyid (r.id.mytextview); Button MyButton</span></span>=<span style="color: #000000;"><span style="color: #000000;">(Button) Findviewbyid (r.id.mybutton); Mytextview.settext (</span></span>"my First textview."<span style="color: #000000;"><span style="color: #000000;">); Mybutton.settext (</span></span>"my First button."<span style="color: #000000;"><span style="color: #000000;">); }}</span></span></pre><p><p></p></p><p><p>The following code is the code in Activity_main</p></p><pre><relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"<span style="color: #000000;"><span style="color: #000000;">Xmlns:tools</span></span>= "http://schemas.android.com/tools"<span style="color: #000000;"><span style="color: #000000;">Android:layout_width</span></span>= "match_parent"<span style="color: #000000;"><span style="color: #000000;">Android:layout_height</span></span>= "match_parent"<span style="color: #000000;"><span style="color: #000000;">Tools:context</span></span>= "${relativepackage}.${activityclass}" > <<span style="color: #000000;"><span style="color: #000000;">TextView Android:id</span></span>= "@+id/mytextview"<span style="color: #000000;"><span style="color: #000000;">Android:layout_width</span></span>= "wrap_content"<span style="color: #000000;"><span style="color: #000000;">Android:layout_height</span></span>= "wrap_content"<span style="color: #000000;"><span style="color: #000000;">Android:text</span></span>= "@string/hello_world"/> <<span style="color: #000000;"><span style="color: #000000;">Button Android:id</span></span>= "@+id/mybutton"<span style="color: #000000;"><span style="color: #000000;">Android:layout_width</span></span>= "fill_parent"<span style="color: #000000;"><span style="color: #000000;">Android:layout_height</span></span>= "wrap_content"/></relativelayout></pre><p><p></p></p><p><p>Android Learning Note--button</p></p></span>