安卓：內容高度是由一些像素從全屏

Question

回來後，我使用Android Studio創建全屏應用程序偏移。 我使用由Android Studio提供的FullScreenActivity模板。

它可以完美地切換全屏模式不同的是活動內容的頂部被一些像素（類似於狀態欄的高度）向上偏移時，從全屏幕的回報。

這裏是屏幕在不同階段的屏幕截圖：全屏幕前，在全屏幕，並從全屏返回。當我打開佈局邊界設置的顯示時，可以看到紅色矩形是視圖邊界。

全屏之前，界限是明確的：動作條的底部重疊內容的頂級

在全屏

從全屏返回之後：動作條的底部是不重疊內容的頂部，這裏是問題，看起來內容的頂部向上移動。

爲什麼會出現這種情況，我怎麼能解決呢？ 請給我一隻手，感謝

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> 

的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

刪除android:fitsSystemWindows="true"，一切都應該罰款