显示键盘时，viewpager片段中的Scrollview不滚动 [英] Scrollview inside a viewpager fragment doesnt scroll when keyboard is shown
问题描述
我有一个活动，其中的布局内容如下:
I have an activity which has a layout content as follows:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
style="@style/ToolBarStyle.Event" />
<com.mypackage.corecode.ui.view.SlidingTabLayout
android:id="@+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/primary_color" />
<android.support.v4.view.ViewPager
android:id="@+id/vendor_main_tabview_pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
在viewpager中，我有一个具有以下布局的片段:
And inside viewpager, I have a fragment which has the following layout:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:weightSum="3"
android:orientation="horizontal">
<EditText
android:theme="@style/ScrollableContentThemeNoActionBar"
android:id="@+id/edit_text_vendor_sms_phone_number"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="wrap_content"
android:inputType="number" />
<Button
android:id="@+id/button_send_sms"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
/>
</LinearLayout>
</LinearLayout>
</ScrollView>
当片段内的内容不适合屏幕时，滚动视图允许用户查看屏幕下方的内容.(按预期工作)
When the content inside the fragment doesn't fit the screen, the scrollview allows the user to see the content which is below the screen. (Works as expected)
问题是当编辑文本成为焦点时，键盘与编辑文本区域重叠，而不是滚动视图导致内容滚动.
The problem is when the edittext gets focus, the keyboard overlaps the edittext area, rather than the scrollview causing the content to scroll.
我希望该片段能够处理显示的键盘和滚动视图以适合屏幕上的键盘.
I expect the fragment to handle keyboard shown and scrollview to fit the keyboard on the screen.
还是我做错了，活动是由键盘引起的吗?由于活动布局中的根视图是线性布局，因此是否限制了扩展?
Or am I wrong and is activity responsible for the keyboard? Since the root view in activity layout is linearlayout, is it restricting the expansion?
我尝试用滚动视图包装活动布局的全部内容，但是如果我不给定大小，则这次viewpager不会出现在屏幕上.即使这样做，我最终还是在片段中包含了一个滚动视图，该片段位于主布局的滚动视图下方，而键盘仍悬停在edittext上.
I tried wrapping the whole content of the activity layout with a scrollview, but this time viewpager doesnt appear on the screen if I don't give it a fixed size. Even when I do, I end up having a scrollview inside the fragment which is under the scrollview of the main layout and still keyboard is hovering over the edittext.
我在这里有点迷失了，我的目标是能够在编辑文本成为焦点时滚动片段内容，但是键盘当前与编辑文本重叠.
I'm a bit lost here, my objective is to be able to scroll the fragment content when the edittext gets focused, but rather the keyboard overlaps the edittext currently.
推荐答案
我可能会犯错，但这可能是由于已知的Android错误所致，您所需要做的只是向项目添加下一个类:
I may mistake, but it's probably because of known Android bug, all you need is to add next class to your project:
public class AndroidBug5497Workaround {
// 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 AndroidBug5497Workaround(activity);
}
private View mChildOfContent;
private int usableHeightPrevious;
private FrameLayout.LayoutParams frameLayoutParams;
private AndroidBug5497Workaround(Activity activity) {
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;
}
mChildOfContent.requestLayout();
usableHeightPrevious = usableHeightNow;
}
}
private int computeUsableHeight() {
Rect r = new Rect();
mChildOfContent.getWindowVisibleDisplayFrame(r);
return (r.bottom - r.top);
}
}
然后通过在您的Activity中调用 assistActivity()方法来简单地使用它，该方法保存 ViewPager 和 SlidingTabLayout :
And then simply use it by calling assistActivity() method in your Activity that holds ViewPager and SlidingTabLayout:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(...);
AndroidBug5497Workaround.assistActivity(this);
...
}
有关更多背景信息，请参见此线程.
For more background check this thread.
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