问题描述
长安，先生！我有一个带有TabLayout + ViewPager和2个片段的活动.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结果，并且没有RecyclerView.setVisibility(GONE)).所以有我的Fragment.xml:
Good day, sirs!I have an Activity with a TabLayout+ViewPager and 2 Fragments in it. In the first Fragment I have a RecyclerView with some items and the SearchView in the Toolbar. I want to show the placeholder when your search query makes RecyclerView disappear (I mean you found no results and RecyclerView.setVisibility(GONE)). So there's my 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_width="match_parent"
android:layout_height="match_parent"
android:background="@color/pale_grey">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_results"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:scrollbarThumbVertical="@android:color/darker_gray"
android:scrollbarSize="4dp"/>
<LinearLayout
android:id="@+id/ll_no_categories"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_below="@+id/toolbar"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone"
android:fitsSystemWindows="true">
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginBottom="24dp"
android:visibility="visible"
app:srcCompat="@drawable/vector_search_big" />
<TextView
android:id="@+id/tv_no_categories"
android:layout_width="match_parent"
android:layout_height="wrap_content"
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时，我将RecyclerView设置为GONE，将LinearLayout设置为VISIBLE.我遇到的问题:我的活动清单中的adjustResize不适用于该活动中的Fragment-占位符仍在键盘下方一半.我在不带片段的活动中做了同样的事情，而我唯一做的是-在活动清单中设置adjustResize.如何使用Fragment处理此问题?
So when my ItemList.size = 0 I set RecyclerView to GONE and LinearLayout to VISIBLE. The problem I got: adjustResize in Manifest of my Activity doesn't work for Fragment in this Activity - placeholder still under the keyboard by half. I did the same thing in the Activity without Fragment and the only thing I did - set adjustResize in Activity Manifest. How to deal with this problem with Fragment?
UPD:好吧，我找到了调整片段大小的解决方案-我在Activity的根元素中添加了fitsSystemWindows = true-但它破坏了我的状态栏...
UPD: Well, I found the solution that resizes my Fragment - I added fitsSystemWindows=true in the root element of my Activity - but it breaks my statusbar...
推荐答案
好的，现在我有了一个可行的解决方案.如果您使用的是SDK< 21，则调整大小效果很好，没有任何问题，但是如果要在SDK> 21上调整大小，只需使用自定义类:
Okay, now I have a working solution. If you are using SDK<21 the resize works fine without any problem, but if you want to resize on SDK>21 just use custom class:
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:
Then in the onCreate() method of Activity that you need to resize:
if(Build.VERSION.SDK_INT >= 21) {
AdjustResizeHelper.assistActivity(this);
}
对我来说很棒.祝你好运！
It works awesome for me. Good luck!
这篇关于android-片段的AdjustResize的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！