Android 开发笔记 1.2 Button

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

mBtn1.setOnClickListener(new View.OnClickListener(){  //点击事件

    @Override
    public void onClick(View v) { //单击事件
        Intent intent = new Intent(MainActivity.this, ButtonActivity.class);  //跳转到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"

        />
    <!--设置填充颜色颜色-->

    <stroke
        android:width="2dp"
        android:color="#000000"
        />
    <!-- 设置边的颜色颜色-->

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

    <!--设置圆角的大小-->

</ 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