为什么我不能用重力布局锁定DrawerLayout

问题描述

我用DrawerLayout，最近我想改变的ListView的重心在drawerLayout。但之后，我改变的ListView重力的android：layout_gravity =开始|底从的android：layout_gravity =开始，drawerLayout不能锁定到

I use DrawerLayout and recently i want to change gravity of listView in drawerLayout. But after i change gravity of listView to android:layout_gravity="start|bottom"from android:layout_gravity="start", drawerLayout can't be lock to

mDrawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);

setDrawerLockMode（）一起工作;

<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>

不过，这并不与锁定;

<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>

`

为什么我不能用锁定模式与其他比重任何线索？

Any clues of why can't I use lock mode with other gravities?

谢谢！

推荐答案

根据在,在仅的可使用的可用比重为 Gravity.LEFT ， Gravity.RIGHT 或 GravityCompat.START ， GravityCompat.END 。

Based on the documentation, the only available gravities that can be used are Gravity.LEFT, Gravity.RIGHT or GravityCompat.START, GravityCompat.END.

（重点煤矿）：

抽屉定位和布局是使用控制
  安卓：对孩子的看法layout_gravity属性对应于
  视图的一面你想要的抽屉，从出现：左或右。
  （或开始/结束在支持布局方向平台版本）

纵观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: do nothing
  }
}

该方法本身只检查是否重力左或右（但使用 GravityCompat 方法，因此开始和 END 应适当翻译）。

The method itself only checks if the gravity is LEFT or RIGHT (but uses a GravityCompat method, so START and END should be appropriately translated).

这将意味着，通过设置的引力开始|底，你推出一个无效的严重性，这将导致 setDrawerLockMode（） 什么都不做。

This would mean that by setting a gravity of "start|bottom", you're introducing an invalid gravity, which causes setDrawerLockMode() to do nothing.

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