android的Java方法：layout_gravity

Java method for android:layout_gravity

提问by André Leit?o

I would like to know if is there a way to call android:layout_gravityproperty from a Java method. I didn't found any method in Android documentation to do it. This is the picture of the layout I want to implement:

我想知道是否有办法android:layout_gravity从 Java 方法调用属性。我没有在 Android 文档中找到任何方法来做到这一点。这是我要实现的布局的图片：

http://www.anddev.org/resources/image/2234

http://www.anddev.org/resources/image/2234

I know to do it through XML, as following:

我知道通过 XML 来做，如下：

<FrameLayout
    xlmns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

      <Button
         android:layout_gravity="left|center_vertical"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="<" />


      <Button
         android:layout_gravity="right|center_vertical"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text=">" />
</FrameLayout>

But in my situation, I need to do it through Java code, because I'll implement another layout views dynamically. To avoid merging XML layout with Java code, I would prefer make all layout using Java.

但在我的情况下，我需要通过 Java 代码来完成，因为我将动态实现另一个布局视图。为了避免将 XML 布局与 Java 代码合并，我更愿意使用 Java 进行所有布局。

采纳答案by Nikolay Ivanov

Well as far as I understand you looking for thisIt is for FrameLayout for other layout see appropriate LayoutParams classes. For setting gravity like in your XML use something like:

好吧，据我所知，你正在寻找这个它是用于其他布局的 FrameLayout，请参阅适当的 LayoutParams 类。要在 XML 中设置重力，请使用以下内容：

FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,Gravity.LEFT | Gravity.CENTER_VERTICAL)

followed by addViewwith newly constructed LayoutParams

其次是addView新建LayoutParams

回答by André Leit?o

Maybe I misunderstand you, but here it is:

也许我误解了你，但它是：

http://developer.android.com/reference/android/widget/TextView.html#setGravity(int)

http://developer.android.com/reference/android/widget/TextView.html#setGravity(int)

回答by Dimitry K

Watchout! This wouldn't work with LinearLayout though. Because LinearLayout.LayoutParams(...) constructor is different from FrameLayout.LayoutParams(...) constructor. The third parameter is not gravity but weight.

小心！但这不适用于 LinearLayout。因为 LinearLayout.LayoutParams(...) 构造函数不同于 FrameLayout.LayoutParams(...) 构造函数。第三个参数不是重力而是重量。

     LinearLayout.LayoutParams(int width, int height, float weight)

as opposed to

与

     FrameLayout.LayoutParams(int width, int height, int gravity)

and this call, despite not producingcompiler error is actually wrong:

而这个调用，尽管没有产生编译器错误实际上是错误的：

lparams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, Gravity.LEFT);

回答by all-ok

button.setBackgroundResource(R.drawable.sound_on);
        button.setText("On");
        button.setGravity(Gravity.CENTER_VERTICAL| Gravity.RIGHT);
        button.invalidate();

回答by Lekensteyn

To change the layout_gravityattribute for an existing view:

要更改layout_gravity现有视图的属性：

Button button = (Button) findViewById(R.id.some_button);
FrameLayout.LayoutParams params;
params = (LayoutParams) button.getLayoutParams();

params.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;
button.setLayoutParams(params);

The button is contained in a FrameLayoutwhich has a gravityattribute corresponding to the layout_gravityXML attribute. Documentation link.

该按钮包含在FrameLayout具有gravity与layout_gravityXML 属性对应的属性的 a 中。文档链接。

回答by Ali Vizcaya

before adding the button, you should change the orientation of your layout

在添加按钮之前，您应该更改布局的方向

yourbutton.setGravity(Gravity.RIGHT);
LayoutParams layout = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, Gravity.RIGHT);
layout.gravity = Gravity.RIGHT;
yourbutton.setLayoutParams(layout);


yourlayout.setGravity(Gravity.RIGHT);
yourlayout.addView(yourbutton);