设置View只显示透明下边框、透明背景框、阴影背景框的方法

下面的代码是实现一个带边框的xml，很常见

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="https://schemas.android.com/apk/res/android">       <solid android:color="@android:color/transparent" />    <stroke android:width="1dp" android:color="#FFFF0000" />     <corners android:radius="0dp" /> </shape>

下面是只显示下边框的xml

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="https://schemas.android.com/apk/res/android">       <solid android:color="@android:color/transparent" />    <stroke android:width="1dp" android:color="#FFFF0000" />     <corners android:radius="0dp" /> </shape>

下面是显示阴影效果的背景

<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="https://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>

点击设置他们的背景颜色吧：

 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;   }  }