设置View只显示透明下边框、透明背景框、阴影背景框的方法

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

<solid android:color="@android:color/transparent" />

<stroke android:width="1dp" android:color="#FFFF0000" />

<corners android:radius="0dp" />
</shape>

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

<solid android:color="@android:color/transparent" />

<stroke android:width="1dp" android:color="#FFFF0000" />

<corners android:radius="0dp" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Bottom 2dp Shadow -->
<item>
<shape  android:shape="rectangle">
<solid android:color="#BBB" />
<corners android:radius="5dp" />
</shape>
</item>

<!-- White Top color -->
<item android:bottom="3px">
<shape  android:shape="rectangle">
<solid android:color="#FFE0EEEE" />
<corners android:radius="5dp" />
<padding
android:top="15dp"
android:right="15dp"
android:bottom="15dp"
android:left="15dp"/>
</shape>
</item>
</layer-list>

public void onClick(View v) {
switch (v.getId()) {
case R.id.btnShowCountTimer :
new MyCountTimer(120000, 1000, btnShowCountTimer).start();
break;
case R.id.btnBgBoard :
btnBgBoard.setBackgroundResource(R.drawable.board);
break;
case R.id.btnOnlyShowLineBottom :
btnOnlyShowLineBottom.setBackgroundResource(R.drawable.board_only_bottom_line);
break;
case R.id.btnShowLayers :
btnShowLayers.setBackgroundResource(R.drawable.board_layers);
break;
default :
break;
}
}