relativelayout

第五次作业

 ̄綄美尐妖づ 提交于 2019-11-30 07:53:31
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.diwuci.MainActivity" android:id="@+id/ly1"> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content"

Android: Slow performance using a big image in ImageView

点点圈 提交于 2019-11-30 04:13:49
问题 I have an Activity where I have a background image in an ImageView, and nine transparent buttons on top of the image. http://i.stack.imgur.com/GGQqd.png When I tap any of the buttons I make a RelativeLayout appears in the top of the background. http://i.stack.imgur.com/JvKQK.jpg The problem is: When I use a big resolution image as a background in the layout the performance is very poor. I'm using a PNG image of 2048 x 1536 , and it's weight is about 500k. When I use a smaller image like 1024

Android Scrollview in RelativeLayout with ButtonBar

拥有回忆 提交于 2019-11-30 03:49:05
问题 I'm trying to implement a login view where several EditTexts and a logo are displayed on the screen with a ButtonBar at the bottom, something like this: alt text http://russellhaering.com/media/addAccount.png The problem is that on very small screens, especially when they are rotated sideways, the entire main view doesn't fit onto the screen. I currently have <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width=

第五次作业

廉价感情. 提交于 2019-11-29 19:51:00
---恢复内容开始--- 1.xml代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android=" http://schemas.android.com/apk/res/android" xmlns:tools=" http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="20dp" tools:context=".MainActivity" android:orientation="vertical" android:background="@mipmap/p30"> <LinearLayout android:layout_marginTop="55dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/text1" android:layout_width="0dp" android

Android UI布局

大憨熊 提交于 2019-11-29 18:36:29
Android UI----User Interface User Interface Layouts UI Overview 编写xml Android Layout Android 七大布局 Tips gravity和layout_gravity的区别 LinearLayout RelativeLayout FrameLayout TableLayout AbsoluteLayout GridLayout ConstraintLayout User Interface Layouts UI Overview 布局可定义应用的页面结构(如Activity的界面结构)。布局中的所有元素均使用View和ViewGroup对象的层次结构进行构建。View通常绘制用户可查看并进行交互的内容。然而,ViewGroup是不可见容器,用于定义View和其他ViewGroup对象的布局结构 View对象通常称为“微件”,可以是众多子类之一,如Button或TextView。ViewGroup对象通常称之为“布局”,可以是提供其他布局结构的众多类型之一,如:LinearLayout或ConstraintLayout。 声明布局的两种方式: 在xml中声明界面元素。 Android提供对应View类及其子类的简明xml词汇,如LinearLayout、TextView和Button等微件和布局的词汇

How to design spannable gridview using recyclerview (SpannableGridLayoutManager)

与世无争的帅哥 提交于 2019-11-29 13:04:33
I want to design grid view like below image provided. The first item should be bigger than the rest. Currently I am using RelativeLayout with GridLayoutManager check below code RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view1); RecyclerView.LayoutManager recyclerViewLayoutManager = new GridLayoutManager(context, 3); recyclerView.setLayoutManager(recyclerViewLayoutManager); recyclerView_Adapter = new RecyclerViewAdapter(context,numbers); recyclerView.setAdapter(recyclerView_Adapter); Dummy array for demo String[] numbers = { "one", "two", "three", "four", "five", "six

Android 给Button加个监听

和自甴很熟 提交于 2019-11-29 11:55:49
在 Android 开 发过程中,Button是常用的控件,用起来也很简单,你可以在界面xml描述文档中定义,也可以在程序中创建后加入到界面中,其效果都是一样的。不过最 好是在xml文档中定义,因为一旦界面要改变是话,直接修改一下xml就行了,不用修改Java程序,并且在xml中定义层次分明,一目了然。另一个是如 果在程序中定义,还要将其加入到界面中,有的还要设置高度宽度,样式之类的,会使程序变得臃肿,开发和维护都不方便。 我们先在程序中定义一个Button Button button = new Button(this);//定义一个button,其中this是上下文,这段代码是在一个Activity的onCreate中创建的。 button.setWidth(100);//一定要设置宽和高。不然会出错的。 button.setHeight(50); button.setText(“Click me”);//按钮上的文字 RelativeLayout relativeLayout = (RelativeLayout)findViewById(R.id.buttonLayout); relativeLayout.addView(button);//加到界面中 以下是在UI xml中定义的按钮。 android:orientation=”horizontal” android

Why am I getting a CircularDependencyException?

十年热恋 提交于 2019-11-29 11:31:44
Hey I am trying to make a notification for my file uploading notification. This is my XML: but it keeps giving me the error: Circular dependencies cannot exist in RelativeLayout. What am I doing wrong? I dont see anything wrong with it? I was also trying to make it look similar to the browser downloader <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp"> <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent"

Relative Layout get Width/Height return 0

那年仲夏 提交于 2019-11-29 10:56:10
I need to get width and height of Relative layout, however I do not know when the Relative Layout is ready to provide me these two attributes. My activity has several tabs and I call the getWidth() and getHeight() in onCreateView() after inflater.inflate(R.layout.fragment_pizza, container, false); , however it returns 0 for both of them, so they are not apparently ready. Is there some kind of event like afterCreateView() or something similar where I can call these two methods and get the actual width and height? Code: public class PizzaFragment extends Fragment { private static final String

[Android开发]LinearLayout与RelativeLayout异同深入探讨

﹥>﹥吖頭↗ 提交于 2019-11-29 10:53:54
Android初级工程师或者校招的面试过程中,很容易被问到LinearLayout与RelativeLayout区别,这是一个基础问题,由此可以引出例如ViewGroup和View绘制流程等问题,可以看出应聘者的掌握程度。 一般可以这么回答回答: LinearLayout为线性布局: 1. 分为垂直布局(vertical)和水平布局(horizontal)两种(android:orientation属性) 2. 可以通过设置控件的android:layout_weight属性以控制各个控件在布局中的相对大小,线性布局会根据该控件layout_weight值与其所处布局中所有控件layout_weight值之和的比值为该控件分配占用的区域。如果layout_weight指为0,控件会按原大小显示,不会被拉伸;对于其余layout_weight属性值大于0的控件,系统将会减去layout_weight属性值为0的控件的宽度或者高度,再用剩余的宽度或高度按相应的比例来分配每一个控件显示的宽度或高度。 3. android:baselineAligned,默认为true,即基准线对其。另外还有android:baselineAlignedChildIndex用于指定以哪个child为基准。 RelativeLayout为相对布局: 1. 允许子元素指定它们相对于其父元素或兄弟元素的位置