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Android 键盘适配优化与横竖屏切换问题解决方案

在开发Android应用时，键盘适配是一个常见的挑战，尤其是在横竖屏切换时可能会出现键盘显示异常的问题。本文将详细介绍一个针对键盘适配的优化方案，并探讨如何解决横竖屏切换后键盘无法正常弹出的问题。

键盘适配逻辑

本优化方案通过观察根视图（rootView）的显示状态，动态调整键盘布局，确保在不同屏幕方向和软键盘状态下应用程序能够正常显示。以下是主要实现步骤：

横竖屏切换后键盘无法弹出的问题

在某些情况下，特别是在横竖屏切换时，键盘可能无法正常弹出。经初步调查，这一问题可能与WebView的焦点丢失有关。以下是针对该问题的解决思路：

代码实现

以下是实现上述逻辑的关键代码片段：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    KeyBoardWorkaround keyBoardWorkaround = new KeyBoardWorkaround();
    keyBoardWorkaround.solve(this);
}

public class KeyBoardWorkaround {
    private static final String TAG = "KeyBoardWorkaround";
    private View rootView;
    private int rootViewVisibleHeight;
    private boolean hasInit = false;
    private int initHeight;
    private int initWidth;
    private FrameLayout.LayoutParams frameLayoutParams;
    private int statusBarHeight;
    public void solve(Activity activity) {
        // 获取根视图
        rootView = activity.getWindow().getDecorView();
        // 获取状态栏高度
        int resourceId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android");
        statusBarHeight = activity.getResources().getDimensionPixelSize(resourceId);
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        final View mChildOfContent = content.getChildAt(0);
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
        // 添加全局布局监听
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                Rect rect = new Rect();
                rootView.getWindowVisibleDisplayFrame(rect);
                int visibleHeight = rect.height();
                Log.e(TAG, "visibleHeight = " + visibleHeight);
                Log.e(TAG, "visibleWidth = " + rect.width());
                if (!hasInit) {
                    initHeight = rect.height();
                    initWidth = rect.width();
                    hasInit = !hasInit;
                }
                if (rootViewVisibleHeight == 0) {
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
                if (rootViewVisibleHeight == visibleHeight) {
                    return;
                }
                if (visibleHeight == initWidth) {
                    rootViewVisibleHeight = visibleHeight;
                    frameLayoutParams.height = initWidth;
                    frameLayoutParams.width = initHeight;
                    mChildOfContent.requestLayout();
                    hasRotate = true;
                    return;
                }
                if (hasRotate) {
                    rootViewVisibleHeight = visibleHeight;
                    frameLayoutParams.height = initHeight;
                    frameLayoutParams.width = initWidth;
                    hasRotate = false;
                    return;
                }
                if (rootViewVisibleHeight - visibleHeight > 200) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                        frameLayoutParams.height = visibleHeight + statusBarHeight;
                    } else {
                        frameLayoutParams.height = visibleHeight;
                    }
                    mChildOfContent.requestLayout();
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
                if (visibleHeight - rootViewVisibleHeight > 200) {
                    frameLayoutParams.height = initHeight;
                    mChildOfContent.requestLayout();
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
            }
        });
    }
}

注意事项

通过以上优化方案，可以有效解决键盘适配问题，确保应用程序在横竖屏切换时键盘能够正常弹出。

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