android - 如何以编程方式从右到左设置浮动操作按钮重力

Question

I have a floating action button. I want to change its gravity from right to left with help of my java code.

Answer 1

There is no any such methods to set the floating action button in left side. You can look at the http://developer.android.com/reference/android/support/design/widget/FloatingActionButton.html

Answer 2

If you are using RelativeLayout as parent you can set the gravity like this,

android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_gravity="start|bottom"

Answer 3

如果您使用的是CoordinatorLayout，则可以这样设置重力，

app:layout_anchorGravity="top|start"

Answer 4

I met the problem like you. And I solved it using LayoutParams. Here is the code.

CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) this.mFab.getLayoutParams();
layoutParams.gravity = Gravity.START | Gravity.BOTTOM;
this.mFab.setLayoutParams(layoutParams);