问Android如何在显示软键盘时调整全屏模式的布局

EN

     AndroidBug5497Workaround.assistActivity(this);

public class AndroidBug5497Workaround {

    // For more information, see https://issuetracker.google.com/issues/36911528
    // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.

    public static void assistActivity (Activity activity) {
        new AndroidBug5497Workaround(activity);
    }

    private View mChildOfContent;
    private int usableHeightPrevious;
    private FrameLayout.LayoutParams frameLayoutParams;

    private AndroidBug5497Workaround(Activity activity) {
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                possiblyResizeChildOfContent();
            }
        });
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }

    private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            if (heightDifference > (usableHeightSansKeyboard/4)) {
                // keyboard probably just became visible
                frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
            } else {
                // keyboard probably just became hidden
                frameLayoutParams.height = usableHeightSansKeyboard;
            }
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }

    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top);
    }
}

getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION /* If you want to hide navigation */
                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE)

/**
 * Implements an effect similar to {@code android:fitsSystemWindows="true"} on Lollipop or higher,
 * except ignoring the top system window inset. {@code android:fitsSystemWindows="true"} does not
 * and should not be set on this layout.
 */
public class FitsSystemWindowsExceptTopFrameLayout extends FrameLayout {

    public FitsSystemWindowsExceptTopFrameLayout(Context context) {
        super(context);
    }

    public FitsSystemWindowsExceptTopFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FitsSystemWindowsExceptTopFrameLayout(Context context, AttributeSet attrs,
                                                 int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
    public FitsSystemWindowsExceptTopFrameLayout(Context context, AttributeSet attrs,
                                                 int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public WindowInsets onApplyWindowInsets(WindowInsets insets) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            setPadding(insets.getSystemWindowInsetLeft(), 0, insets.getSystemWindowInsetRight(),
                    insets.getSystemWindowInsetBottom());
            return insets.replaceSystemWindowInsets(0, insets.getSystemWindowInsetTop(), 0, 0);
        } else {
            return super.onApplyWindowInsets(insets);
        }
    }
}

<com.example.yourapplication.FitsSystemWindowsExceptTopFrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Your original layout here -->
</com.example.yourapplication.FitsSystemWindowsExceptTopFrameLayout>

mRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener(){
            public void onGlobalLayout() {
                checkHeightDifference();
            }
    });

private void checkHeightDifference(){
    // get screen frame rectangle 
    Rect r = new Rect();
    mRootView.getWindowVisibleDisplayFrame(r);
    // get screen height
    int screenHeight = mRootView.getRootView().getHeight();
    // calculate the height difference
    int heightDifference = screenHeight - (r.bottom - r.top);

    // if height difference is different then the last height difference and
    // is bigger then a third of the screen we can assume the keyboard is open
    if (heightDifference > screenHeight/3 && heightDifference != mLastHeightDifferece) {
        // keyboard visiblevisible
        // get root view layout params
        FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mRootView.getLayoutParams();
        // set the root view height to screen height minus the height difference
        lp.height = screenHeight - heightDifference;
        // call request layout so the changes will take affect
        .requestLayout();
        // save the height difference so we will run this code only when a change occurs.
        mLastHeightDifferece = heightDifference;
    } else if (heightDifference != mLastHeightDifferece) {
        // keyboard hidden
        PFLog.d("[ChatroomActivity] checkHeightDifference keyboard hidden");
        // get root view layout params and reset all the changes we have made when the keyboard opened.
        FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mRootView.getLayoutParams();
        lp.height = screenHeight;
        // call request layout so the changes will take affect
        mRootView.requestLayout();
        // save the height difference so we will run this code only when a change occurs.
        mLastHeightDifferece = heightDifference;
    }
}