layer-list方式自定义progressbar

来源：互联网发布：git for windows 64 编辑：程序博客网时间：2024/05/17 03:52

先上布局：

<ProgressBar            android:id="@+id/pb"            style="@android:style/Widget.ProgressBar.Horizontal"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:progressDrawable="@drawable/bg_progressbar"            android:max="100"            />

progressDrawable是重点，根标签是layer-list，看下代码：

<?xml version="1.0" encoding="utf-8"?><!-- Copyright (C) 2008 The Android Open Source Project     Licensed under the Apache License, Version 2.0 (the "License");     you may not use this file except in compliance with the License.     You may obtain a copy of the License at          http://www.apache.org/licenses/LICENSE-2.0     Unless required by applicable law or agreed to in writing, software     distributed under the License is distributed on an "AS IS" BASIS,     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.     See the License for the specific language governing permissions and     limitations under the License.--><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:id="@android:id/background">        <shape>            <corners android:radius="5dip" />            <solid android:color="@color/color_e7e7e7"/>        </shape>    </item>    <item android:id="@android:id/secondaryProgress">        <clip>            <shape>                <corners android:radius="5dip" />                <solid android:color="@color/color_f04726"/>            </shape>        </clip>    </item>    <item android:id="@android:id/progress">        <clip>            <shape>                <corners android:radius="5dip" />                <solid android:color="@color/color_f04726"></solid>            </shape>        </clip>    </item></layer-list>

这里介绍一下clip标签，<clip>标签使用了如下的3个属性来控制如何截取图像。

android:drawable：指定要剪切的原图像，这里用的不是图片，用的是shape。

android:clipOrientation：截取的方向。可取的值：horizontal和vertical。分别表示水平和垂直方向截取图像。

android:gravity：表示如何截取图像。例如，left表示从左侧截取图像，right表示从右侧截取图像。

这样出来的进度是直角的，如果想要进度也是圆角的，布局如下：

?xml version="1.0" encoding="utf-8"?><!-- Copyright (C) 2008 The Android Open Source Project     Licensed under the Apache License, Version 2.0 (the "License");     you may not use this file except in compliance with the License.     You may obtain a copy of the License at          http://www.apache.org/licenses/LICENSE-2.0     Unless required by applicable law or agreed to in writing, software     distributed under the License is distributed on an "AS IS" BASIS,     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.     See the License for the specific language governing permissions and     limitations under the License.--><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:id="@android:id/background">        <shape>            <corners android:radius="5dip" />            <solid android:color="@color/color_e7e7e7"/>        </shape>    </item>    <item android:id="@android:id/secondaryProgress">        <clip>            <shape>                <corners android:radius="5dip" />                <solid android:color="@color/color_f04726"/>            </shape>        </clip>    </item>    <item android:id="@android:id/progress">        <scale            android:scaleWidth="100%" >        <shape>            <corners android:radius="5dip" />            <solid android:color="@color/color_f04726"></solid>        </shape>        </scale>    </item></layer-list>

关键点是将clip标签替换为scale标签，scaleWidth设置为100%。

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