导航栏后面的内容

Posted 2023-04-18

【中文标题】导航栏后面的内容

【英文标题】：Content going behind Navigation Bar

【发布时间】：2016-06-11 07:19:37

【问题描述】：

我在使用 android 5.0 及更高版本时遇到问题。每当我将任何视图与父底部对齐时，内容都会隐藏在软导航按钮后面。

以上是从 Android Studio 1.5 创建新项目后生成的屏幕截图。我刚刚在片段底部添加了一个编辑文本。

如您所见，一半的编辑文本位于导航栏后面。

虽然代码是由 Android Studio 自动生成的，但我仍然在下面发布代码。

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.trial.exps.tabbedtrial">
    <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    </application>
</manifest>

activity_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"
    android:id="@+id/main_content"
    android:layout_
    android:layout_
    android:fitsSystemWindows="true"
    tools:context="com.trial.exps.tabbedtrial.MainActivity">

    <android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_
    android:layout_
    android:paddingTop="@dimen/appbar_padding_top"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_
        android:layout_
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">

    </android.support.v7.widget.Toolbar>

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_
        android:layout_ />

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_
    android:layout_
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_
    android:layout_
    android:layout_gravity="end|bottom"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

fragment_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.trial.exps.tabbedtrial.MainActivity$PlaceholderFragment">

    <TextView
    android:id="@+id/section_label"
    android:layout_
    android:layout_ />
    <EditText
    android:layout_
    android:layout_
    android:hint="Put Some Text"
    android:layout_alignParentBottom="true"
    android:background="@drawable/curved_edges"/>

</RelativeLayout>

curved_edges.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#fff" />
    <stroke android: android:color="#454545" />
    <padding android:left="6dp" android:top="6dp" android:right="6dp" android:bottom="6dp" />
    <corners android:radius="6dp" />
</shape>

MainActivity.java

package com.trial.exps.tabbedtrial;

import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity 

    /**
     * The @link android.support.v4.view.PagerAdapter that will provide
     * fragments for each of the sections. We use a
     * @link FragmentPagerAdapter derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * @link android.support.v4.app.FragmentStatePagerAdapter.
     */
    private SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The @link ViewPager that will host the section contents.
     */
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        
    );

    


    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
    

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) 
        return true;
    

    return super.onOptionsItemSelected(item);
    

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment 
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    public PlaceholderFragment() 
    

    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) 
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        TextView textView = (TextView) rootView.findViewById(R.id.section_label);
        textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
        return rootView;
    
    

    /**
     * A @link FragmentPagerAdapter that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter 

    public SectionsPagerAdapter(FragmentManager fm) 
        super(fm);
    

    @Override
    public Fragment getItem(int position) 
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return PlaceholderFragment.newInstance(position + 1);
    

    @Override
    public int getCount() 
        // Show 3 total pages.
        return 3;
    

    @Override
    public CharSequence getPageTitle(int position) 
        switch (position) 
            case 0:
                return "SECTION 1";
            case 1:
                return "SECTION 2";
            case 2:
                return "SECTION 3";
        
        return null;
    
    

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    </style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

</resources>

附：如果删除或更换可绘制是您解决方案的一部分，那么我已经尝试过了。而且我在 Android 指南中也找不到任何合适的解决方案。

【问题讨论】：

这里有什么解决办法吗？我有类似的问题...

@bashan 问题在于工具栏的滚动标志。它在滚动工具栏时将 UI 向下推以将其拉起。您可以将其关闭以使 UI 正常。

【参考方案1】：

这是解决方案。

大多数布局都可以通过在 value-21 style.xml 中添加这些属性来解决

    <item name="android:windowTranslucentStatus">true</item>
    <item name="android:windowTranslucentNavigation">true</item>
    <item name="android:fitsSystemWindows">true</item>

对于其他人，我已经计算了导航栏的高度并为我的视图添加了边距。

 public static int getSoftButtonsBarSizePort(Activity activity) 
// getRealMetrics is only available with API 17 and +
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) 
    DisplayMetrics metrics = new DisplayMetrics();
    activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
    int usableHeight = metrics.heightPixels;
    activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
    int realHeight = metrics.heightPixels;
    if (realHeight > usableHeight)
        return realHeight - usableHeight;
    else
        return 0;

return 0;

【参考方案2】：

android:fitsSystemWindows="true"

这对我有用。视图不再与软导航重叠。

【参考方案3】：

我没有现成的解决方案，但这可能会有所帮助。 activity_main.xml 根元素声明它应该适合系统窗口：android:fitsSystemWindows="true"。

我想你必须找到一种方法来检测底部导航栏是否在屏幕上，如果是，请在活动布局中添加额外的 margin-bottom。

【讨论】：

该标签没有任何区别，只要键盘弹出，它就会重新调整屏幕大小。

【参考方案4】：

android:fitsSystemWindows="true" 没有解决我的布局问题。我必须为部分隐藏的顶部和底部视图添加相应的属性。

android:paddingTop="?android:attr/actionBarSize" android:paddingBottom="?android:attr/actionBarSize"

例如在顶部：

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main"
    android:layout_
    android:layout_>

    <ScrollView
        android:id="@+id/myid"
        android:layout_
        android:layout_
        app:layout_constraintTop_toTopOf="parent"
        android:paddingTop="?android:attr/actionBarSize">
...

【讨论】：

这种解决方法效率不高。可能您需要进行更多调试才能弄清楚为什么该标志不适合您。