如何在Android中为布局设置固定宽高比

I am trying to set the width of the layout to "fill_parent" while having the height of the view just the same length, to make the layout a square.

我试图将布局的宽度设置为“fill_parent”,同时使视图的高度具有相同的长度,以使布局成为正方形。

Any suggestions will be appreciate, thanks in advance! :D

任何建议都会很感激,提前谢谢! :d

7 个解决方案

#1

With introduction of ConstraintLayout you don't have to write either a single line of code or use third-parties or rely on PercentFrameLayout which were deprecated in 26.0.0.

通过引入ConstraintLayout,您不必编写单行代码或使用第三方或依赖于26.0.0中不推荐使用的PercentFrameLayout。

Here's the example of how to keep 1:1 aspect ratio for your layout using ConstraintLayout:

以下是如何使用ConstraintLayout为布局保持1:1宽高比的示例:

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="0dp"
        android:layout_marginStart="0dp"
        android:layout_marginTop="0dp"
        android:background="@android:color/black"
        app:layout_constraintDimensionRatio="H,1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </FrameLayout>

</android.support.constraint.ConstraintLayout>

Or instead of editing your XML file, you can edit your layout directly in Layout Editor:

或者,您可以直接在布局编辑器中编辑布局,而不是编辑XML文件:

#2

In your build.gradle add:

在build.gradle中添加:

compile 'com.android.support:percent:23.1.1'

and in your layout.xml wrap whatever view or viewgroup you want to to follow a ratio inside a PercentFrameLayout where:

并在您的layout.xml中包装您想要遵循PercentFrameLayout内部比率的任何视图或视图组,其中:

android:layout_width="match_parent"
android:layout_height="wrap_content"

and then for the view or viewgroup you want to to follow a ratio replace android:layout_width and android:layout_height:

然后对于视图或视图组,你想要遵循一个比例替换android:layout_width和android:layout_height:

    app:layout_aspectRatio="178%"
    app:layout_widthPercent="100%"

and you have a view or viewgroup where the aspect ratio is 16:9 (1.78:1) with the width matching the parent and the height adjusted accordingly.

并且您有一个视图或视图组,其宽高比为16:9(1.78:1),宽度与父级匹配,相应地调整高度。

Note: It's important you remove the normal width and height properties. Lint will complain, but it'll work.

注意:删除正常的宽度和高度属性非常重要。 Lint会抱怨,但它会起作用。

#3

You might try initially setting the layout_height to wrap_content. But from there I think you have to go into code. Just to experiment, in your activity try something like:

您可以尝试将layout_height设置为wrap_content。但是从那里我认为你必须进入代码。只是为了实验,在你的活动中尝试类似:

@Override
public void onResume(){
    super.onResume();
    findViewById(R.id.squareView).getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override public void onGlobalLayout() {
            View squareView = findViewById(R.id.squareView);
            LayoutParams layout = squareView.getLayoutParams();
            layout.height = squareView.getWidth();
            squareView.setLayoutParams(layout);
            squareView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
        }
    });
}

Where R.id.squareView is the id of the view in question. And note, this code is wrapped in the onGlobalLayout call to ensure that squareView.getWidth() has a meaningful value.

其中R.id.squareView是相关视图的id。请注意,此代码包含在onGlobalLayout调用中,以确保squareView.getWidth()具有有意义的值。

#4

I created a layout library for similiar use case. Feel free to use it.

我为类似的用例创建了一个布局库。随意使用它。

RatioLayouts

Installation

Add this to the top of the file

将其添加到文件的顶部

repositories {
    maven {
        url  "http://dl.bintray.com/riteshakya037/maven" 
    }
}


dependencies {
    compile 'com.ritesh:ratiolayout:1.0.0'
}

Usage

Define 'app' namespace on root view in your layout

在布局中的根视图上定义“app”命名空间

xmlns:app="http://schemas.android.com/apk/res-auto"

Include this library in your layout

在您的布局中包含此库

<com.ritesh.ratiolayout.RatioRelativeLayout
        android:id="@+id/activity_main_ratio_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:fixed_attribute="WIDTH" // Fix one side of the layout 
        app:horizontal_ratio="2" // ratio of 2:3
        app:vertical_ratio="3">

#5

LinearLayout ll = (LinearLayout)findViewById(R.id.LL);


int width = ll.getWidth();
LinearLayout.LayoutParams ll_params = new LinearLayout.LayoutParams(width, width);
ll.setLayoutParams(ll_params);

#6

 final RelativeLayout rlMyList = findViewById(R.id.rlMyList);
 rlMyList.postDelayed(new Runnable() {
     @Override
     public void run() {
          int width = rlMyList.getWidth();
          LayoutParams lp = (LayoutParams) rlMyList.getLayoutParams();
          lp.width = width;
          lp.height = (int) (width * 0.67);// in my case ratio 3:2
          rlMyList.setLayoutParams(lp);
     }
 },500);

#7

set height as fill_parent, the width as wrap_content

将height设置为fill_parent,将width设置为wrap_content

and you fix the aspect ratio with android:adjustViewBounds="true"

并用android修改宽高比:adjustViewBounds =“true”