android - 调整片段大小
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【中文标题】android - 调整片段大小【英文标题】:android - AdjustResize for Fragment 【发布时间】:2017-12-22 21:13:40 【问题描述】:早安,先生们!
我有一个带有 TabLayout+ViewPager 和 2 个片段的 Activity。在第一个片段中,我有一个带有一些项目的 RecyclerView 和工具栏中的 SearchView。当您的搜索查询使 RecyclerView 消失时,我想显示占位符(我的意思是您没有找到任何结果和RecyclerView.setVisibility(GONE)
)。所以这是我的 Fragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_
android:layout_
android:background="@color/pale_grey">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_results"
android:layout_
android:layout_
android:scrollbars="vertical"
android:scrollbarThumbVertical="@android:color/darker_gray"
android:scrollbarSize="4dp"/>
<LinearLayout
android:id="@+id/ll_no_categories"
android:layout_
android:layout_
android:layout_alignParentBottom="true"
android:layout_below="@+id/toolbar"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone"
android:fitsSystemWindows="true">
<ImageView
android:layout_
android:layout_
android:layout_marginBottom="24dp"
android:visibility="visible"
app:srcCompat="@drawable/vector_search_big" />
<TextView
android:id="@+id/tv_no_categories"
android:layout_
android:layout_
android:gravity="center_horizontal"
android:text="@string/activity_home_services_category_list_empty"
android:textColor="@color/black_40"
android:textSize="16sp"/>
</LinearLayout>
</RelativeLayout>
所以当我的ItemList.size = 0
我将 RecyclerView 设置为 GONE
和 LinearLayout
设置为 VISIBLE
。我遇到的问题:我的活动清单中的adjustResize
不适用于此活动中的片段 - 占位符仍在键盘下方一半。我在没有 Fragment 的 Activity 中做了同样的事情,我唯一做的事情是在 Activity Manifest 中设置 adjustResize
。 Fragment如何处理这个问题?
UPD:嗯,我找到了调整 Fragment 大小的解决方案 - 我在 Activity 的根元素中添加了 fitSystemWindows=true - 但它破坏了我的状态栏...
【问题讨论】:
【参考方案1】:UPD 03.03.2021:我的问题是半透明状态栏,没有它,adjustResize
in Manifest
没有任何自定义类,一切正常。
好的,现在我有一个可行的解决方案。如果您使用 SDK21 上调整大小,只需使用自定义类:
package YOUR_PACKAGE_NAME;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Build;
import android.view.Display;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import android.widget.FrameLayout;
import java.lang.reflect.InvocationTargetException;
public class AdjustResizeHelper
private boolean mHasBackKey = false;
private boolean mHasMenuKey = false;
// For more information, see https://code.google.com/p/android/issues/detail?id=5497
// To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
public static void assistActivity(Activity activity)
new AdjustResizeHelper(activity);
private View mChildOfContent;
private int usableHeightPrevious;
private FrameLayout.LayoutParams frameLayoutParams;
private int mNavBarHeight = 0;
private AdjustResizeHelper(Activity activity)
mHasMenuKey = ViewConfiguration.get(activity).hasPermanentMenuKey();
mHasBackKey = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
mNavBarHeight = getNavigationBarSize(activity).y;
FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
mChildOfContent = content.getChildAt(0);
mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener()
public void onGlobalLayout()
possiblyResizeChildOfContent();
);
frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
private void possiblyResizeChildOfContent()
int usableHeightNow = computeUsableHeight();
if (usableHeightNow != usableHeightPrevious)
int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
int heightDifference = usableHeightSansKeyboard - usableHeightNow;
if (heightDifference > (usableHeightSansKeyboard / 4))
// keyboard probably just became visible
frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
else
// keyboard probably just became hidden
frameLayoutParams.height = usableHeightSansKeyboard - mNavBarHeight;
mChildOfContent.requestLayout();
usableHeightPrevious = usableHeightNow;
public static Point getNavigationBarSize(Context context)
Point appUsableSize = getAppUsableScreenSize(context);
Point realScreenSize = getRealScreenSize(context);
// navigation bar on the right
if (appUsableSize.x < realScreenSize.x)
return new Point(realScreenSize.x - appUsableSize.x, appUsableSize.y);
// navigation bar at the bottom
if (appUsableSize.y < realScreenSize.y)
return new Point(appUsableSize.x, realScreenSize.y - appUsableSize.y);
// navigation bar is not present
return new Point();
public static Point getAppUsableScreenSize(Context context)
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
return size;
public static Point getRealScreenSize(Context context)
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
if (Build.VERSION.SDK_INT >= 17)
display.getRealSize(size);
else if (Build.VERSION.SDK_INT >= 14)
try
size.x = (Integer) Display.class.getMethod("getRawWidth").invoke(display);
size.y = (Integer) Display.class.getMethod("getRawHeight").invoke(display);
catch (IllegalAccessException e) catch (InvocationTargetException e) catch (NoSuchMethodException e)
return size;
private int computeUsableHeight()
Rect r = new Rect();
mChildOfContent.getWindowVisibleDisplayFrame(r);
return r.bottom;
然后在Activity的onCreate()
方法中需要调整大小:
if(Build.VERSION.SDK_INT >= 21)
AdjustResizeHelper.assistActivity(this);
它对我来说很棒。祝你好运!
【讨论】:
好东西,但是页面布局在底部边缘爬行,请修复此问题(Pixel 3a A11) 老实说这个答案已经过时了,因为我的问题是半透明状态栏。没有这个自定义类,Manifest 中的 adjustResize 一切正常。以上是关于android - 调整片段大小的主要内容,如果未能解决你的问题,请参考以下文章