android - Why i can't lock DrawerLayout with layout gravity -

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i use drawerlayout , want change gravity of listview in drawerlayout. after change gravity of listview android:layout_gravity="start|bottom"from android:layout_gravity="start", drawerlayout can't lock 

mdrawer.setdrawerlockmode(drawerlayout.lock_mode_locked_closed);

setdrawerlockmode() work with;

<android.support.v4.widget.drawerlayout  xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" >  <relativelayout     android:layout_width="match_parent"     android:layout_height="match_parent" > </relativelayout>  <listview     android:id="@+id/drawer_list"     android:layout_width="320dp"     android:layout_height="match_parent"     android:layout_gravity="start"     android:background="#f3f3f4"     android:choicemode="singlechoice" > </listview>

but doesn't lock with;

<android.support.v4.widget.drawerlayout  xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" >  <relativelayout     android:layout_width="match_parent"     android:layout_height="match_parent" > </relativelayout>  <listview     android:id="@+id/drawer_list"     android:layout_width="320dp"     android:layout_height="match_parent"     android:layout_gravity="start|bottom"     android:background="#f3f3f4"     android:choicemode="singlechoice" > </listview>

`

any clues of why can't use lock mode other gravities?

thanks!

based on documentation, only available gravities can used gravity.left, gravity.right or gravitycompat.start, gravitycompat.end.

(emphasis mine):

drawer positioning , layout controlled using android:layout_gravity attribute on child views corresponding side of view want drawer emerge from: left or right. (or start/end on platform versions support layout direction.)

looking @ source code

public void setdrawerlockmode(int lockmode, int edgegravity) {   final int absgrav = gravitycompat.getabsolutegravity(edgegravity,                                                        viewcompat.getlayoutdirection(this));   if (absgrav == gravity.left) {     mlockmodeleft = lockmode;   } else if (absgrav == gravity.right) {     mlockmoderight = lockmode;   }   if (lockmode != lock_mode_unlocked) {     // cancel interaction in progress     final viewdraghelper helper = absgrav == gravity.left ? mleftdragger : mrightdragger;     helper.cancel();   }   switch (lockmode) {     case lock_mode_locked_open:       final view toopen = finddrawerwithgravity(absgrav);       if (toopen != null) {         opendrawer(toopen);       }       break;     case lock_mode_locked_closed:       final view toclose = finddrawerwithgravity(absgrav);       if (toclose != null) {         closedrawer(toclose);       }       break;       // default: nothing   } }

the method checks if gravity left or right (but uses gravitycompat method, start , end should appropriately translated).

this mean setting gravity of "start|bottom", you're introducing invalid gravity, causes setdrawerlockmode() nothing.


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