Android: Inhalt Höhe wird um einige Pixel nach der Rückkehr von Vollbild versetzt

Question

Ich benutze Android Studio, um eine Vollbild-App zu erstellen. Und ich habe die FullScreenActivity Vorlage von Android Studio verwendet.

Es kann den Vollbildmodus perfekt umschalten, außer dass der Inhalt des Inhalts oben um einige Pixel versetzt ist (ähnlich der Höhe der Statusleiste), wenn vom Vollbildmodus zurückgekehrt wird.

Hier sind Screenshots des Bildschirms in verschiedenen Phasen: vor dem Vollbild, im Vollbildmodus und Rückkehr vom Vollbildmodus. Und da ich die Anzeige der Layoutgrenzen aktiviert habe, können Sie die roten Rechtecke sehen, die Sichtbegrenzungen sind.

Vor dem ganzen Bildschirm, die Grenzen sind klar: Boden der Aktionsleiste überlappt Inhalt Top

im Vollbildmodus

Nach Rückkehr aus dem Vollbild: Unterseite der Aktionsleiste ist nicht überlappende Inhalt des oben, und hier ist das Problem, es scheint Inhalt oben nach oben bewegt werden.

Warum würde das passieren und wie könnte ich es lösen? bitte geben Sie mir eine Hand, dank

FullScreenActivity.java

import android.annotation.SuppressLint; 
import android.support.v7.app.ActionBar; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.view.MotionEvent; 
import android.view.View; 

/** 
* An example full-screen activity that shows and hides the system UI (i.e. 
* status bar and navigation/system bar) with user interaction. 
*/ 
public class FullscreenActivity extends AppCompatActivity { 
    /** 
    * Whether or not the system UI should be auto-hidden after 
    * {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds. 
    */ 
    private static final boolean AUTO_HIDE = true; 

    /** 
    * If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after 
    * user interaction before hiding the system UI. 
    */ 
    private static final int AUTO_HIDE_DELAY_MILLIS = 3000; 

    /** 
    * Some older devices needs a small delay between UI widget updates 
    * and a change of the status and navigation bar. 
    */ 
    private static final int UI_ANIMATION_DELAY = 300; 
    private final Handler mHideHandler = new Handler(); 
    private View mContentView; 
    private final Runnable mHidePart2Runnable = new Runnable() { 
     @SuppressLint("InlinedApi") 
     @Override 
     public void run() { 
      // Delayed removal of status and navigation bar 

      // Note that some of these constants are new as of API 16 (Jelly Bean) 
      // and API 19 (KitKat). It is safe to use them, as they are inlined 
      // at compile-time and do nothing on earlier devices. 
      mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE 
        | View.SYSTEM_UI_FLAG_FULLSCREEN 
        | View.SYSTEM_UI_FLAG_LAYOUT_STABLE 
        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY 
        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 
        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION); 
     } 
    }; 
    private View mControlsView; 
    private final Runnable mShowPart2Runnable = new Runnable() { 
     @Override 
     public void run() { 
      // Delayed display of UI elements 
      ActionBar actionBar = getSupportActionBar(); 
      if (actionBar != null) { 
       actionBar.show(); 
      } 
      mControlsView.setVisibility(View.VISIBLE); 
     } 
    }; 
    private boolean mVisible; 
    private final Runnable mHideRunnable = new Runnable() { 
     @Override 
     public void run() { 
      hide(); 
     } 
    }; 
    /** 
    * Touch listener to use for in-layout UI controls to delay hiding the 
    * system UI. This is to prevent the jarring behavior of controls going away 
    * while interacting with activity UI. 
    */ 
    private final View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() { 
     @Override 
     public boolean onTouch(View view, MotionEvent motionEvent) { 
      if (AUTO_HIDE) { 
       delayedHide(AUTO_HIDE_DELAY_MILLIS); 
      } 
      return false; 
     } 
    }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_fullscreen); 

     mVisible = true; 
     mControlsView = findViewById(R.id.fullscreen_content_controls); 
     mContentView = findViewById(R.id.fullscreen_content); 


     // Set up the user interaction to manually show or hide the system UI. 
     mContentView.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       toggle(); 
      } 
     }); 

     // Upon interacting with UI controls, delay any scheduled hide() 
     // operations to prevent the jarring behavior of controls going away 
     // while interacting with the UI. 
     findViewById(R.id.dummy_button).setOnTouchListener(mDelayHideTouchListener); 
    } 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 

     // Trigger the initial hide() shortly after the activity has been 
     // created, to briefly hint to the user that UI controls 
     // are available. 
//  delayedHide(100); 
    } 

    private void toggle() { 
     if (mVisible) { 
      hide(); 
     } else { 
      show(); 
     } 
    } 

    private void hide() { 
     // Hide UI first 
     ActionBar actionBar = getSupportActionBar(); 
     if (actionBar != null) { 
      actionBar.hide(); 
     } 
     mControlsView.setVisibility(View.GONE); 
     mVisible = false; 

     // Schedule a runnable to remove the status and navigation bar after a delay 
     mHideHandler.removeCallbacks(mShowPart2Runnable); 
     mHideHandler.postDelayed(mHidePart2Runnable, UI_ANIMATION_DELAY); 
    } 

    @SuppressLint("InlinedApi") 
    private void show() { 
     // Show the system bar 
     mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN 
       | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION); 
     mVisible = true; 

     // Schedule a runnable to display UI elements after a delay 
     mHideHandler.removeCallbacks(mHidePart2Runnable); 
     mHideHandler.postDelayed(mShowPart2Runnable, UI_ANIMATION_DELAY); 
    } 

    /** 
    * Schedules a call to hide() in [delay] milliseconds, canceling any 
    * previously scheduled calls. 
    */ 
    private void delayedHide(int delayMillis) { 
     mHideHandler.removeCallbacks(mHideRunnable); 
     mHideHandler.postDelayed(mHideRunnable, delayMillis); 
    } 
} 

activity_fullscreen.xml

<FrameLayout 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:background="#0099cc" 
    tools:context=".FullscreenActivity"> 

    <!-- The primary full-screen view. This can be replaced with whatever view 
     is needed to present your content, e.g. VideoView, SurfaceView, 
     TextureView, etc. --> 
    <TextView 
     android:id="@+id/fullscreen_content" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:gravity="center" 
     android:keepScreenOn="true" 
     android:text="@string/dummy_content" 
     android:textColor="#33b5e5" 
     android:textSize="50sp" 
     android:textStyle="bold" /> 

    <!-- This FrameLayout insets its children based on system windows using 
     android:fitsSystemWindows. --> 
    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:fitsSystemWindows="true"> 

     <LinearLayout 
      android:id="@+id/fullscreen_content_controls" 
      style="?metaButtonBarStyle" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_gravity="bottom|center_horizontal" 
      android:background="@color/black_overlay" 
      android:orientation="horizontal" 
      tools:ignore="UselessParent"> 

      <Button 
       android:id="@+id/dummy_button" 
       style="?metaButtonBarButtonStyle" 
       android:layout_width="0dp" 
       android:layout_height="wrap_content" 
       android:layout_weight="1" 
       android:text="@string/dummy_button" /> 

     </LinearLayout> 
    </FrameLayout> 

</FrameLayout> 

manifest.xml

... 
<application 
    android:name=".MyApplication" 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    ... 
    <activity 
     android:name=".FullscreenActivity" 
     android:configChanges="orientation|keyboardHidden|screenSize" 
     android:label="@string/title_activity_fullscreen" 
     android:theme="@style/FullscreenTheme"></activity> 
    ... 
</application> 
... 

Answer 1

entfernen android:fitsSystemWindows="true" und alles sollte in Ordnung sein