Android学习之——实现圆角Button

在drawable文件夹下新建btn_shape.xml文件:

 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
     <solid android:color="#ffffff"/>
     <corners
         android:topLeftRadius="8dip"
         android:topRightRadius="8dip
         android:bottomLeftRadius="8dip"
         android:bottomRightRadius="8dip"/>
 </shape>

先解释一下上面的代码：

1.shape用于定义形状，有四种形状(矩形rectangle| 椭圆oval | 直线line | 圆形ring)。

2.solid用于设置填充形状的颜色。

3.corners用于创建圆角（只用于形状是矩形）。

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topLeftRadius、topRightRadius、bottomLeftRadius、bottomRightRadius分别设置左上，右上，左下，右下圆角的半径。

使用方法：

android:background="@drawable/btn_shape"

   <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/button"
         android:background="@drawable/btn_shape"
         />

效果图：

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YtWqRWq7U3i27dumViYvL+++/XHjKmhP4qRWTurtDUfFVbWcWt82kbD8XPUeUdLy7Prai8ramq1GgqyitLCkpTr2TvPZw4Pzpnf+2hqagsC1L9W/snb7pgP21h7959TOe62my+aL81zP6T/1ibW5o6f229+aL92sD+IydbmFuaDptgPsWl9/3VOSU+Pj4uLi6f3jNz5kwLC4vnn3/+01q++uor7SO7taek2unTpx0dHV966SUrK6tz585Vf76oqOiHH3544403NmzYUFVVFRAQYGNjs2LFivLy8l27dvXr12///v137tzZs2dPp06dli5dmp+fX1lZuX79+meeeebs2bNMCf11O5u6obg8r/Y5cKss53zaDwfjPg1OXafMC8q6FZ1RFHH1us9J9Uq/BJfLWZ6ld2pema+qqiooTfVLcNH+yav8+jtOtXjP2eK/Z+4+D23jWbtRU8xHTbFYG9R/zdH+7063GDiqV+3qnJI9e/ZMnjx5bD3MmjXrxIkT1Ye0cuXKmTNnxsXF1TjUysrKAwcOWFlZjRs3rvqT8fHxQ4YMcXZ2vnHjRlVVVXJy8ty5cz///PP09PT09PRp06YtX778+vXrlZWVixYtsrS0jIuLKykp6dOnz4wZM2r/bWinZO/evSNHjrx8+ben8zEl1ATzif8s42Zknfewlt0pUuYdO5X83ZHEL30TPvdNmBegXHIubWNqYUjtZ6ZVVVVVaMrj8wI8oyc/4SHJvvXR6dOnfXx8rl+v+w3rr1+/rlKpqj8sLS2Ni4tLTEys/jAiIuLSpUva19qEh4erVCrtXSepqannzp3Tfv7SpUv5+fkPOoCYmJhdu3ZlZWVVf4YpoSbYL1GjQjO23SzL1lTV8T5AmipNyZ0buSWJmTcvZ968kl+qvl1RVOebDFRqKvJKVMfUy7ZHvPOEh8S7qBE1xgZ4xky5nO1ZdDvjsd/VvUJTlluiPJ+2sc5fPfeoMSVEjbIfwwZ4RE+6cG1Txs3Ikjs3HumX8lZoym+V5SQXnD2Z/O3Oy++JvFk0U0LUeBvwc+Rwn/i5F65tis7eH3vdp17lHLqc5Rmc8v3+2I+3RwyVetP52lOSU9x0fnlFFb+8gujPqfaUXCsKa9S/ePx+dypLTyWvqvMiMyVEktWekuicAw9699lGp6D0WoBycZ0XmSkhkqz2lAQoFxeX5zb0CMhQ5Z/0ipla50VmSogkqz0lv0SOSr4RXPtZuY1OcXlucOq62r8tiCkhkq/2lGwNsz8UPyenOK5R32NSVnErOueAe/T7D7rITAmRZHVOyY/hDn4JLtcKLz3SY9VPj+Ly3MvZe71ipv0Y5vCgi8yUEElW55RsDbP/Mdxhf+zH59N+SC0MKS7PawyborlTeftGaWrcdf9jSd/suTKhzh3ZypQQ/RE9aEq0/Rw5zDNm6qG4OX4JLocT5j/N+SW4+CbMO3B1xp4rE7aFP+x3szMlRPI9fEqaZEwJkXxMCREJxJQQkUBMCREJxJQQkUBMCREJxJQQkUB/3SnZefk9IpKqekoa/Ej+5Ius09BPzgWalOopaegD+fMwJYA8pgSAAKYEgACmBICA6in5q8WUAJIa/JRmSoCmoMFPaaYEQCPGlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABDAlAAQwJQAEMCUABCgkwYAT0wHAAAAAAAAAAAAAAAAAADgT6aoS0MfFPDXoFAo9PT0Gvspp1Ao9PX1n3/+eRMTEysrq759+1pZWRkbGz///PP6+vpN4NI9qoY+ZPyVKBSKF154Yfz48V9//bWTk9OLL77Y0Ef0OBQKRatWrSwtLT///PONGzd6eXn5+fkdOXLEz8/Py8tr48aNn3/+uaWlZatWrRrjCaYdev1Hp6ur2xgvLxoZhULRunVre3v7devWhYSEpKSkXLly5d13323VqlVDH9qj0dfX79y589KlS/39/a9evZqUlHTu3Dlvb293d/cDBw6cO3cuKSnp6tWr/v7+S5cu7dy5s76+fkMf8iNo1arV0KFD16xZs379+g2PYv369a6urr169WJN8AfS19fv0qXLP//5z6CgIKVSGRAQ4Ofnp1KpXFxc2rZt29BH9wgMDAysrKzc3d1jY2OjoqLWrFkzduxYa2vr7t27Gxsbd+/e3draeuzYsWvWrImKioqNjXV3d7eysjIwMGjoA6+vjh07Hj16NCUl5TFe9pqSkuLp6amnp9fQFwJNkfYWzfTp0w8cOHD16tXw8PCvv/7awsLiyy+/jI2NXbhw4XPPPdfQx1hfzZo1s7GxCQwMVCqVHh4egwcPbt++ffPmzWt8WfPmzV9++eXBgwd7eHgolcrAwEAbG5tmzZo1yDE/EoVC0bVr1+Tk5FOnTr333nvDH8WoUaOSk5MTExOfeeYZrphAkvYWjZ2d3U8//RQZGZmQkPDzzz8PGTLkxRdfbNas2ezZs2NiYhYtWmRoaNjQR1ovurq6nTp1CggIUCqVbm5uXbp0qT0i92vevLmRkZGbm5v2WlinTp10dXX/tKN9PLq6usbGxqmpqQcPHnzuuecMDAya1Y+BgUHr1q2TkpJUKtVzzz3HlECM9g6F5cuXh4SEqFSqoKCgKVOmdOjQQXv6KRSK2bNnR0dHN6IpadGihZubW1JS0p49ezp06FCfXdDV1e3QocOePXuSkpLc3NxatGjxJxznk6ieEm9v70e6cqFQKAwMDJgSSFIoFG3btnV2dj516pRSqYyKilqyZImRkVHr1q2r/wtrdFOiq6vbp0+f5OTkixcv9ujRo/7XL3R1dXv06HHx4sXk5OQ+ffo85VdMmBI8FRQKRbNmzWxtbQ8cOJCQkJCUlLRjxw4rK6tnnnmmxl1xjW5K9PT0tm/frlKpFi9e/KiPyOjr6y9evFilUm3fvv0pv0uSKUED0z5DqX379hs2bEhMTExJSTlz5szYsWOfffbZOk+8xjUlCoXC0NBQpVLFxMR07tz5Ua9Z6Orqdu7cOSYmRqVSGRoaPs2nGVOChqRQKJo3bz5jxozY2NjU1NSEhIQlS5a88MILD/m/d+OaEl1dXVtb26ysLD8/v8e7haKrq+vn55eVlWVra/s038ZhStCQXn755eDg4MzMzIyMDHd39zfffPN/PuuxcU2Jjo6Ok5PTtWvXXF1dH28IFAqFq6vrtWvXnJycnubTjClBg1EoFKtXr05NTY2IiBgxYkQ9X1nTuKZEoVAsWLAgNTV14cKFj3eSKBSKhQsXpqamzp8//2k+zZgSNBhdXd2vv/46OTk5Kipq4sSJbdq0qc+9ko1uSubPn5+WlrZo0aLHnpJFixalpaW5uLg8zacZU4IGo1AoXnrpJU9Pz7i4uPT0dG9v7z59+rRt2/bhD1U0rinR0dGZPn16enr6unXrHvsGzrp169LT06dNm/Y0n2ZMCRqS9m7XSZMmnTx5MiEhQalUfvvtt127dv3b3/72oP+kGteU6OrqWltbZ2RkBAQEPN6raQwMDAICAjIzM62srLjbFXgg7YPBL7300ldffXX+/PmkpKSQkJBPPvnktddeq/Mpno1rSrRPuouNjY2Nje3evfujnicKhaJ79+7ab2/btu3TfJoxJXgqKBQKfX19c3PzTZs2Xbp0SaVS7d27d+TIke3atatxB0rjmhIdHR09Pb3169er1eoVK1Y86vPfW7RosWLFCrVavX79ep6iBtSXQqF49tlnx48f7+XlFR0dHRMT4+rqamNjY2hoWH3dvtFNiUKh6NWrV3x8fHh4uK2tbf0XQU9Pz9bWNjw8PC4u7ul/Lw+mBE8dfX39Dh06zJs3z9/fPz4+/syZM1988UX37t1bt26t0winREdHp3nz5suXL1epVN7e3m+99VZ91kRPT++tt97y9vZOSkpatmzZw19J/DRgSvA0UigULVu27N2796pVq86ePZuQkODl5fX++++/9tprBgYGjW5KFApFhw4dPDw8VCrVL7/8Ymlp2bJly4d8fcuWLS0tLX/55ReVSuXp6dmhQ4en/wTTTklKSoq3t/ezzz6r9yhatGjBlOAPpH0Bi6Oj49atWyMjIy9fvrxhw4ahQ4d+9dVXjev9SnR0dPT19U1NTd3d3ZVKpa+v7+TJk42MjLRv4Ko9ebT/0KpVKyMjo8mTJ/v6+iqVSnd3d1NT00bxtowKhaJLly5qtfrs2bNOTk5TpkyZXG/Tpk1LTk6Oj4//v//7P6YEfxR9ff3XX3/dyclp79698fHxp0+fPn78uFqtnjdvXuN6Q8ZmzTPEDLUAAATzSURBVJr16NFjw4YNUVFRMTEx27dvnzt3rqOjY//+/a2trfv37+/o6Dh37tzt27fHxMRERUVt2LChR48ejeIt1LTat2+/d+/e5OTkR303xtTUVLVavXnz5qf8rmU0etrbO+bm5osXL9buSGho6NChQ5/+NwSqQU9P79VXX3V2dt61a1dUVJRarQ4LCwsMDPT19Q0MDAwLC1Or1VFRUbt27XJ2dn711Vcb16nVokULa2trFxeXfz26efPmGRsbN/QlwF+GoaGhg4ODs7Ozo6NjI7p1U0OLFi1MTEwmTpy4ZMkSNze33bt3e3l57d69283NbcmSJRMnTjQxMWl0K6mlfVC/5aN7mp99h6ZJ0VR+pZaenl6bNm06derUvXt3MzOz7t27d+rUqU2bNk3g0gH4U1Xf51rnhwAAAAAAAAAAAACeam+Pn2U6fpbZ+Fk9J8wynzCz98SZfT+YYTfpk4GTPxkyxXnYVKeRUz92nPbx6Gkfj57qNHqqs+PUTxynfuI4bYbjtJmO02aNnDZrxNRZw6bOGjp19qDJs+0nzbb9YLbN+7N7T5xlPmGW2fhZb4+b1WPcrO5jZ701dtZbY2e+NXZmt/cesTEzu42ZaXK3GY+U8X1Vf7LbmBk93pv59tiZZmNnmo+bZTVhVp+Js/u//6ndB58OmDTHYdKcgZPmDLqvgZM+dfhgtv37s+wmzrKdMNNm3IzeYz8xH+NsNsb57Xedu7/r3G20s/FoZ+PRzl1Hf/LAHO/W5bEyupvz3UbVyMlopJPRiI+Mhk/v8s7ULkMndxk8sevAcV3t3zXuP9K433Bj22Emfd8x6TPEpM9gE5vf6mYzuJvNoG42g0xsBplYDzS2Hmhs5dDVamBXq0FdrAZ1sRrcxWaoUd/hRraORnZj3rQf9+bAiW8OnvTm0KlvvjP9zWEfvjH8ozdGfPzGCCfhhjt1/q2P69Ww+vaP6t6RqdNvfXS3oY/Z60Me1Id1NPgxe63OBn342qDpj1HHgXfTORR33Sfuul9czuH4HP/47MCE7BPKrGBV1gV1Zqg6Mzw5IyolIzo1PSY1MyY1KyY1KyY1Jzbteuy1vKvp+XEZN2IzCmIyCqLTC6+kF0amF126VhSSVng2tfB0cuEJdWFQUkGAquCIssBfecNfeeNwYo3y/f53N+7r9/8q4WH53tf9nz+ckO+fmB+QeCNQeeOYquCkuuBscuGFlMJLaUXh125GXLsVlX7rcnrx5fTiy+m37nUz6lpRRFpheGrhpZSCEHX+WVXeaWXuicTcoITcgPhc/7jcw3G5fnG5vnG5vnF5PvXuUO2u5h26mnvoau7B+/KOvb/r3jHXD/yunAPROQeicw5cyTpwOd07Ms07PPngJdXBkPhD52N8gqN8Tof7nLrkczLU50SIz/ELPsfO+xw77xN03ifonE/QOZ+gs9oOBQYfCjxzMPCM99Ez3keDDxwNPhBwdn/g+X3HLu47Eb7vVNTeMzF7z8Z5XVB6hao9L6V6hqV5hqd7RGR4RGZ6RGR6RGR6RP6+iIfl/r/LqNF9357lEZnlqS0qyysqyysqe+9lbTn1ad8f2d6onL1R2XujsvdGZntFZntGZntGZHtEZHtEZLmHZ+0Jz9oTnrVbW1g9upRZz3bdq/7fUquM3ZcydmkL1Za+82L6zovpO0PSd4Zc+/V3pf164bf+H8Q/euU0a9XfAAAAAElFTkSuQmCC" alt="" />

 参考网址:
 http://developer.android.com/guide/topics/resources/drawable-resource.html#Shape