如何设置的LinearLayout的重力和布局重心编程 [英] How to set both gravity and layout gravity of a LinearLayout programatically

问题描述

我冒着写一个重复的问题，但我研究的答案另一个SO质疑 ，我意识到，我无法找到一个简单的问题和答案，其中包括设置重力和一个的LinearLayout 的layout_gravity。另外，我是困惑，当说起的ViewGroup ，而不仅仅是一个观点它们之间的区别。我在下面回答我的问题。

I am risking writing a duplicate question, but as I was researching the answer to another SO question, I realized that I couldn't find a simple question and answer that included setting both gravity and layout_gravity of a LinearLayout. Also, I was confused as to the difference between them when talking about a ViewGroup rather than just a view. I am answering my question below.

下面是一些其他的问题，我认为：

Here are some of the other questions I viewed:

• 如何设置重力布局编程？
• 设置重力的LinearLayout编程
• <一个href="http://stackoverflow.com/questions/9678785/android-setting-layoutparams-programmatically">android - 设置的LayoutParams编程
• 的LayoutParams比重不工作
• layout_gravity线性布局
• <一个href="http://stackoverflow.com/questions/4948914/problem-with-setlayoutparams-method-in-android-ui">Problem与setLayoutParams在Android的UI
方法
• <一个href="http://stackoverflow.com/questions/5715612/how-to-set-setlayoutparams-for-linear-layout-elements">how设置setLayoutParams线性布局元素
• <一个href="http://stackoverflow.com/questions/5151056/is-it-possible-to-change-the-layout-width-and-height-in-android-at-run-time">Is有可能改变布局宽度和高度的Andr​​oid在运行时？

• How to set gravity to layout programmatically?
• Set gravity for LinearLayout programmatically
• android - setting LayoutParams programmatically
• LayoutParams gravity not working
• layout_gravity in linear layout
• Problem with setLayoutParams method in android UI
• how to set setLayoutParams for linear layout elements
• Is it possible to change the layout width and height in Android at run time?

推荐答案

previously，我已经'重力'和'layout_gravity'之间的差别为布局中的观点解释

Background

Previously, I have explained the difference between 'gravity' and `layout_gravity' for views within a layout.

设置的的LinearLayout 本身的变化范围内它的意见位置重力。设置的layout_gravity一个的LinearLayout 如何改变的的LinearLayout 被安排其父布局中。

Setting the gravity of a LinearLayout itself changes the location of the views within it. Setting the layout_gravity of a LinearLayout changes how the LinearLayout is arranged within its parent layout.

此图显示了一个的LinearLayout （棕色）在的FrameLayout （白色）。该的LinearLayout 的重力设置为 center_horizo​​ntal 及其 layout_gravity 设置为右|。底部

This image shows a LinearLayout (brown) within a FrameLayout (white). The LinearLayout's gravity is set to center_horizontal and its layout_gravity is set to right|bottom.

下面是XML：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
    android:id="@+id/llExample"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:layout_gravity="right|bottom"
    android:background="#e3e2ad"
    android:gravity="center_horizontal"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:background="#bcf5b1"
        android:text="TextView 1" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:background="#aacaff"
        android:text="TextView 2" />
</LinearLayout>

</FrameLayout>

更改的事情编程

下面code说明了如何同时更改的<$ C引力和 layout_gravity $ C>的LinearLayout 。

Changing things programmatically

The following code shows how to change both the gravity and the layout_gravity of the LinearLayout.

public class LinearLayoutGravity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.linear_layout_gravity);

    // Change the gravity (not layout_gravity) of the LinearLayout
    LinearLayout ll = (LinearLayout) findViewById(R.id.llExample);
    ll.setGravity(Gravity.CENTER);

    // Change the layout_gravity (not gravity) of the LinearLayout      
    FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(400, 400);
    params.gravity = Gravity.TOP;
    params.gravity = Gravity.RIGHT;
    ll.setLayoutParams(params);
}
}

这里是结果：

And here is the result:

这篇关于如何设置的LinearLayout的重力和布局重心编程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！