无法隐藏软输入键盘 - getWindowToken（）始终为null

时间：2017-06-09 06:22:03

标签： android android-fragments

我有一个带有ViewPager设置的Tabs的Activity，在其中一个片段中有一个EditText，它在Activity启动时打开软输入键盘，这不是我想要的。我一直试图隐藏它但是当我试图获取一个WindowToken它总是为null - 在EditText本身，在Fragment的根视图上，在父活动的ContentView上（我试过{{1}在带有findViewById(android.R.id.content)的ContentView上获取的每个视图上，有和没有getDecorView()，有和没有getRootView()）。 getChildAt()也返回null。 此外，我尝试从getCurrentFocus()和我保留在Application类中的引用中获取父Activity，它们的工作方式相同。

我的最终目标是隐藏键盘，或者根本不显示键盘，除非用户明确地调用它。如果我必须找到一种方法来获得一个WindowToken，我想这样做，但如果有另一种隐藏键盘的方法，我也很乐意尝试。

我想知道为什么这个问题被低估了。如果我不知道原因，我无法改善它。

相关代码的比特：

activity_main.xml中：

getActivity()

app_bar_main.xml：

<android.support.v4.widget.DrawerLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:background="@color/windowBackground"
    tools:openDrawer="start">

<include
    layout="@layout/app_bar_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<include
    layout="@layout/drawer" />

</android.support.v4.widget.DrawerLayout>

（在任何人说什么之前，Scroll不是我的想法）

content_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:fresco="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.company.app.activities.MainActivity">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:elevation="4dp"
    android:theme="@style/AppTheme.AppBarOverlay">

    ...

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/underline_grey"
        app:tabMode="scrollable"
        app:tabGravity="center"
        app:popupTheme="@style/AppTheme.PopupOverlayBg"/>

</android.support.design.widget.AppBarLayout>
<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:scrollbars="vertical"
    android:orientation="vertical"
    app:layout_anchor="@+id/appbar_layout"
    android:fillViewport="true">
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <include
            layout="@layout/bg"
            android:layout_width="match_parent"
            android:layout_height="800dp" />
    <include
        android:id="@+id/pager_frame"
        layout="@layout/content_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/></FrameLayout>
</ScrollView>
</android.support.design.widget.CoordinatorLayout>

fragment_get_bonuses.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.company.app.activities.MainActivity"
tools:showIn="@layout/app_bar_main">

<android.support.v4.view.ViewPager
    android:id="@+id/main_page_pager"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

MainActivity.java：

<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:orientation="vertical"
android:gravity="center"
tools:context="com.company.app.fragments.GetBonusesFragment">

...

<android.support.v7.widget.CardView
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/guideline50"
app:layout_constraintBottom_toTopOf="@+id/guideline70"
card_view:contentPadding="4dp"
card_view:cardUseCompatPadding="true"
card_view:cardElevation="4dp"
card_view:cardCornerRadius="10dp"
card_view:cardBackgroundColor="@color/windowBackground"
android:layout_span="6">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:padding="4dp"
    android:gravity="center"
    android:weightSum="1">
    <EditText
        android:id="@+id/bonuses_code_edit"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:layout_weight=".5"
        android:padding="8dp"
        android:layout_marginRight="4dp"
        android:background="@drawable/border_grey"
        android:hint="xxxx-xxxx-xxxx"
        android:maxLines="1"
        android:lines="1"
        android:inputType="text"
        android:nextFocusForward="@+id/bonuses_code_card"/>
    <android.support.v7.widget.CardView
        android:id="@+id/bonuses_code_card"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginLeft="4dp"
        card_view:contentPadding="0dp"
        card_view:cardUseCompatPadding="false"
        card_view:cardElevation="4dp"
        card_view:cardCornerRadius="10dp"
        card_view:cardBackgroundColor="@color/pinkAcivateCode"
        android:layout_weight=".5"
        android:clickable="true"
        android:onClick="onMenuButtonsClick">
        <TextView
            android:id="@+id/bonuses_code_button"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/activate_code"
            android:textColor="@color/textColorPrimary"
            android:lines="2"
            android:padding="8dp" />
    </android.support.v7.widget.CardView>
</LinearLayout>
</android.support.v7.widget.CardView>
...

<android.support.constraint.Guideline
android:id="@+id/guideline50"
android:layout_width="1dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.5"
tools:layout_editor_absoluteY="0dp"
tools:layout_editor_absoluteX="0dp" />

<android.support.constraint.Guideline
android:id="@+id/guideline70"
android:layout_width="1dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.7"
tools:layout_editor_absoluteY="0dp"
tools:layout_editor_absoluteX="0dp" />

...

</android.support.constraint.ConstraintLayout>

}

申请类：

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

AppCompatActivity context;

...

TabLayout mainPageTabs;

View pagerView;
ViewPager mainPagePager;
MainPageTabsAdapter adapter;

TextView tabBonuses;
...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Fresco.initialize(this);
    setContentView(R.layout.activity_main);
    context = this;
    App.getContext().setCurrent(context); // saves reference to currently running Activity in Application class
    ...

    pagerView = findViewById(R.id.pager_frame);
    mainPageTabs = (TabLayout) findViewById(R.id.tabs);
    ...
    setupMainTabs();
}

public void setupMainTabs(){
    if (mainPagePager == null) mainPagePager = (ViewPager) findViewById(R.id.main_page_pager);
    if (mainPageTabs == null) mainPageTabs = (TabLayout) findViewById(R.id.tabs);
    setupMainPageViewPager(mainPagePager);
    mainPageTabs.setupWithViewPager(mainPagePager,true);
    ...

    tabBonuses = (TextView) LayoutInflater.from(this).inflate(R.layout.tab_item, null); // TextView with a background
    tabBonuses.setText(getText(R.string.collect_bonuses));
    ...
    mainPageTabs.getTabAt(0).setCustomView(tabBonuses);
    ...
//        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
//        imm.hideSoftInputFromWindow(findViewById(R.id.pager_frame).getWindowToken(), 0);
}

private void setupMainPageViewPager(ViewPager viewPager) {
    adapter = new MainPageTabsAdapter(getSupportFragmentManager(),this);
    viewPager.setAdapter(adapter);
    viewPager.setOffscreenPageLimit(2);
}

...

@Override
protected void onResume() {
    super.onResume();
    App.getContext().setCurrent(context);
    ...
//        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
//        imm.hideSoftInputFromWindow(findViewById(R.id.pager_frame).getWindowToken(), 0);
}

...

MainPageTabsAdapter.java：

...
private static App context;
private AppCompatActivity current;
...
@Override
public void onCreate() {
    super.onCreate();
    if (context == null) context = (DreamClub) getApplicationContext();
    ...
}
...

public void setCurrent(AppCompatActivity a) {
    current = a;
}

public Activity getCurrent(){return current;}
...

public static App getContext() {
    if (context == null) context = new DreamClub();
    return context;
}

GetBonusesFragment.java：

public class MainPageTabsAdapter extends FragmentPagerAdapter {

Context context;

ArrayList<Fragment> fragmList;
ArrayList<String> titleList;

public MainPageTabsAdapter(FragmentManager fm, Context context) {
    super(fm);
    this.context = context;
    fragmList = new ArrayList<>();
    fragmList.add(new GetBonusesFragment());
    ...
    titleList = new ArrayList<>();
    titleList.add(context.getString(R.string.collect_bonuses));
    ...
}

@Override
public Fragment getItem(int position) {
    return fragmList.get(position);
}

...

@Override
public CharSequence getPageTitle(int position) {
    return titleList.get(position);
}
}

2 个答案:

答案 0 :(得分：1)

只需在清单活动

中添加此内容即可
  

机器人：windowSoftInputMode =＆＃34; stateHidden＆＃34; 

<activity
            android:name=".activity.SignupActivity"

            android:windowSoftInputMode="stateHidden" />

答案 1 :(得分：0)

在清单文件中添加

 <activity android:name="com.your.package.ActivityName"
  android:windowSoftInputMode="stateHidden"  />

或尝试

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)‌;

但是如果您的要求像按钮上的隐藏keyborad点击或backPressed那么就像这样使用

public static void HideKeyboard(Context context, View view) {
    if (view == null) {
        return;
    }
    InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
    if (!imm.isActive()) {
        return;
    }
    imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}

请更多关注此链接

How to hide Soft Keyboard when activity starts

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