Android Development Notes 1.2 Button

mBtn1 = (Button)findViewById(R.id.mBtn1);  

mBtn1 .setOnClickListener ( new new View.OnClickListener () {   // click event 

    @Override
 public void onClick (View v) { // click event of 
        the Intent the Intent = new new the Intent (MainActivity. the this , ButtonActivity. class );   // Jump to ButtonActivity 
        startActivity (Intent);
    }
});    

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle"  
    >
    <solid
        android:color="#ff9999"

        />
     <! - set the filling color Color ->

    < Stroke
 Android : width = "2DP"
 Android : Color = "# 000000"
 />
 <- edge color of the color set -!>                            

    <corners
        android:radius="10dp"
        />

    <! - set the size of the fillet ->

</ shape>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="false">
        <shape>
            <solid android:color="#ff9999"/>
            <corners android:radius="10dp"/>
        </shape>

    </item>
    <!--设置未按压时的样式-->

    <item android:state_pressed="true">
        <shape>
            <solid android:color="#000000"/>
            <corners android:radius="10dp"/>
        </shape>
    </item>
    <!--设置按压时的样式-->
</selector>

android:background="@drawable/bg_btn"  引用格式