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我有一个小型演示聊天 UI 应用程序。此应用程序有一个底部导航栏。当键盘出现时，我需要隐藏底部导航栏。
正如您在 EditText 元素中单击时看到的那样，键盘出现但底部导航栏保持可见。我已经尝试过类似 这种测量方法 的方法，但是UI元素会 像这样 闪烁。
当键盘可见时，是否有适当的方法隐藏底部导航栏？
编辑： 在下面的活动中，您可以看到我在哪里设置键盘侦听器以在确定键盘可见时调整 UI 元素的位置。
这是我的活动代码，使用上面链接中的 setKeyboardListener 方法并将其设置在 onCreateView 中：
package uk.cal.codename.projectnedry.TeamChatFragment;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.Layout;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;
import com.roughike.bottombar.BottomBar;
import java.util.ArrayList;
import butterknife.BindView;
import butterknife.ButterKnife;
import uk.cal.codename.projectnedry.R;
import uk.cal.codename.projectnedry.TeamChatFragment.ListAdapter.TeamChatListAdapter;
import uk.demo.cal.genericmodelviewpresenter.GenericMvp.GenericMvpFragment;
import static android.view.View.GONE;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link TeamChatView.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link TeamChatView#newInstance} factory method to
* create an instance of this fragment.
*/
public class TeamChatView extends GenericMvpFragment implements TeamChatContract.RequiredViewOps {
private OnFragmentInteractionListener mListener;
@BindView(R.id.teamChatList)
RecyclerView mTeamChatRecyclerView;
@BindView(R.id.teamChatSendButton)
ImageButton mTeamChatSendButton;
@BindView(R.id.messageTextInput)
EditText mMessageTextInput;
TeamChatListAdapter mTeamChatListAdapter;
TeamChatListAdapter.ClickListener mTeamChatListClickListener;
private ArrayList<String> mTestMessageList;
public interface OnKeyboardVisibilityListener {
void onVisibilityChanged(boolean visible);
}
public final void setKeyboardListener(final OnKeyboardVisibilityListener listener) {
final View activityRootView = ((ViewGroup) getActivity().findViewById(android.R.id.content)).getChildAt(0);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
private boolean wasOpened;
private final int DefaultKeyboardDP = 100;
// From @nathanielwolf answer... Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
private final Rect r = new Rect();
@Override
public void onGlobalLayout() {
// Convert the dp to pixels.
int estimatedKeyboardHeight = (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());
// Conclude whether the keyboard is shown or not.
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
boolean isShown = heightDiff >= estimatedKeyboardHeight;
if (isShown == wasOpened) {
Log.d("Keyboard state", "Ignoring global layout change...");
return;
}
wasOpened = isShown;
listener.onVisibilityChanged(isShown);
}
});
}
public TeamChatView() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @return A new instance of fragment TeamChatView.
*/
public static TeamChatView newInstance() {
TeamChatView fragment = new TeamChatView();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@SuppressLint("MissingSuperCall")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(TeamChatPresenter.class, TeamChatModel.class, savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View view = inflater.inflate(R.layout.fragment_team_chat_view, container, false);
this.mUnbinder = ButterKnife.bind(this, view);
mTestMessageList = new ArrayList<>();
this.mTeamChatListAdapter = new TeamChatListAdapter(mTestMessageList);
this.mTeamChatRecyclerView.setAdapter(this.mTeamChatListAdapter);
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
this.mTeamChatRecyclerView.setLayoutManager(linearLayoutManager);
this.mTeamChatSendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(!String.valueOf(mMessageTextInput.getText()).equals("")) {
getSpecificImpOfGenericPresenter().sendMessage(String.valueOf(mMessageTextInput.getText()));
mMessageTextInput.setText("");
mTeamChatRecyclerView.smoothScrollToPosition(mTestMessageList.size());
}
}
});
setKeyboardListener(new OnKeyboardVisibilityListener(){
@Override
public void onVisibilityChanged(boolean visible) {
RelativeLayout contentFrame = (RelativeLayout) getActivity().findViewById(R.id.content_company_navigation);
BottomBar lowerNavigationBar = (BottomBar) getActivity().findViewById(R.id.bottomBar);
if (visible) { // if more than 100 pixels, its probably a keyboard...
lowerNavigationBar.setVisibility(GONE);
contentFrame.setPadding(0, 0, 0, 0);
mTeamChatRecyclerView.smoothScrollToPosition(mTestMessageList.size());
} else {
contentFrame.setPadding(0, 0, 0, convertDpToPixel(60, getContext()));
mTeamChatRecyclerView.smoothScrollToPosition(mTestMessageList.size());
lowerNavigationBar.setVisibility(View.VISIBLE);
}
}
});
return view;
}
/**
* This method converts dp unit to equivalent pixels, depending on device density.
*
* @param dp A value in dp (density independent pixels) unit. Which we need to convert into pixels
* @param context Context to get resources and device specific display metrics
* @return A float value to represent px equivalent to dp depending on device density
*/
public static int convertDpToPixel(float dp, Context context){
Resources resources = context.getResources();
DisplayMetrics metrics = resources.getDisplayMetrics();
int px = (int) (dp * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT));
return px;
}
public void addToTestMessageList(String str){
this.mTestMessageList.add(str);
this.mTeamChatListAdapter.notifyDataSetChanged();
}
@Override
public void onDestroyView() {
super.onDestroyView();
// getView().getViewTreeObserver().removeGlobalOnLayoutListener(test);
}
@Override
public TeamChatPresenter getSpecificImpOfGenericPresenter() {
return (TeamChatPresenter) this.mPresenter;
}
}
这是我的 XML 布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="uk.cal.codename.projectnedry.TeamChatFragment.TeamChatView">
<android.support.v7.widget.RecyclerView
android:layout_above="@+id/chatViewMessageEntryLayout"
android:id="@+id/teamChatList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:isScrollContainer="false"
android:paddingTop="10dp"
android:scrollbars="vertical" />
<RelativeLayout
android:id="@+id/chatViewMessageEntryLayout"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<View
android:id="@+id/chatViewMessageEntrySeperator"
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#e3e3e8" />
<EditText
android:id="@+id/messageTextInput"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_below="@+id/chatViewMessageEntrySeperator"
android:layout_toLeftOf="@+id/teamChatSendButton"
android:background="@android:color/transparent"
android:hint="Enter message"
android:inputType="textCapSentences|textMultiLine"
android:maxLength="1000"
android:maxLines="4"
android:paddingLeft="10dp" />
<ImageButton
android:id="@+id/teamChatSendButton"
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_gravity="center"
android:background="#00B9EF"
android:src="@drawable/ic_send_white_24dp" />
</RelativeLayout>
</RelativeLayout>
原文由 Calco 发布，翻译遵循 CC BY-SA 4.0 许可协议
java
android
我最终使用了高度测量方法，这似乎是 this answer 中描述的软键盘检测的标准方法。然而，我使用 了这个库的 实现，因为它仍然是相同的
ViewTreeObserver.OnGlobalLayoutListener方法，实现得很好，并允许我从我的应用程序主代码库中提取代码。当触发此键盘可见性侦听器时，我会隐藏/显示底部导航栏（我已 在此处 进行了解释）。