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Android 自定义最大宽度，高度, 宽高比例 Layout

前言这篇博客主要介绍的是怎样自定义一个可以指定最大宽度，高度，以及宽高比的 Layout。原理其实很简单，就是通过重写 onMeasure 方法，重新制定 MeasureSpec。使用说明常用的自定义属性<attr name="ml_maxWidth" format="dimension".....

Android | 深入理解View.post()获取宽高、Window加载View原理

背景：如何在onCreate()中获取View的宽高？在某些场景下，需要我们在Activity的onCreate()中获取View的宽高，如果直接通过getMeasuredHeight()、getMeasuredWidth()去获取，得到的值都是0：2022-11-14 16:56:42.604 E...

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Android 通过图片url获取图片的宽高

订阅专栏 //获取图片真正的宽高 Glide.with(mContext).asBitmap().load(list.get(0).imagePath).into(new SimpleTarget<Bitmap>() { @Override public void onResourceR...

Android自定义Dialog以控制其位置和宽高

1.自定义Dialog类import android.app.Dialog; import android.content.Context; import android.view.Gravity; import android.view.View; import android.view.Wind...

Android获取包名版本号，获取屏幕宽高。

获取包名版本号：private String getAppInfo() { try { String pkName = this.getPackageName(); String versionName = this.getPackageManager().getPackageInfo(pkName...

Android中使控件保持固定宽高比的几种方式

前言我们在android开发过程中可能会遇到一种情况，一个组件需要保持固定的宽高比，但是组件本身大小却不定。比如我们需要让一个组件宽度与屏幕宽度一致，这样就无法确定宽度。那么如何让控件保持固定宽高比？有几种方法供大家选择。自定义View自定义view，重写onMeasure或onLayout等相关方...

【Android 内存优化】自定义组件长图组件 ( 获取图像宽高 | 计算解码区域 | 设置图像解码属性复用像素格式 | 图像绘制 )

文章目录一、获取图像真实宽高二、计算解码区域三、设置解码参数内存复用像素格式四、图像绘制五、执行效果六、源码及资源下载官方文档 API : BitmapRegionDecoder在【Android 内存优化】自定义组件长图组件 ( 自定义组件构造方法 ) 基础上继续开发 ;一、获取图像真实宽高显...

android 动态设定RelativeLayout 宽高总是运行失败?报错

在adapter的方法中，希望动态设定RelativeLayout的宽高，运行的时候，直接报错，更可气的是居然找不到错误原因，感觉这是设定不行 RelativeLayout.LayoutParams linearParams = (RelativeLayout.LayoutParams)...

Android中子View如何通知父容器子View的宽高已更改?报错

需要将自定义view在horizontalScrollView中显示, 先初始化自定义view(这时onMessure()已被父容器调用,宽高0,0), 然后将数据传递给自定义view, 绘制内容, 计算出宽高, 但是这时父容器已不会再调用onMessure了,认为自定义view宽高为0,0. 那么...

Android自定义Tablayout下划线指示器Indicator：设置宽高、圆角、渐变颜色

Android自定义Tablayout下划线指示器Indicator：设置宽高、圆角、渐变颜色 Android原生的Tablayout下面有一个指示器（指示线、下划线），如图所示：详情见附录1。但是Android原生的Tablayout指示器Indicator自定义空间很有限，能设置颜色，如果想把T...

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更新时间 2023-10-13 21:30:59

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