如何在Android中捕获"虚拟键盘显示/隐藏"事件？

在Android中，可以通过监听软键盘的显示和隐藏事件来捕获"虚拟键盘显示/隐藏"事件。以下是一种常用的方法：

创建一个继承自ViewTreeObserver.OnGlobalLayoutListener接口的监听器类，用于监听布局变化事件：

public class KeyboardVisibilityListener implements ViewTreeObserver.OnGlobalLayoutListener {
    private final View rootView;
    private final OnKeyboardVisibilityListener onKeyboardVisibilityListener;
    private boolean isKeyboardVisible = false;

    public interface OnKeyboardVisibilityListener {
        void onVisibilityChanged(boolean isVisible);
    }

    public KeyboardVisibilityListener(View rootView, OnKeyboardVisibilityListener onKeyboardVisibilityListener) {
        this.rootView = rootView;
        this.onKeyboardVisibilityListener = onKeyboardVisibilityListener;
    }

    @Override
    public void onGlobalLayout() {
        Rect r = new Rect();
        rootView.getWindowVisibleDisplayFrame(r);
        int screenHeight = rootView.getRootView().getHeight();

        // 计算屏幕高度和可见区域的差值，如果大于一定阈值，则认为键盘显示
        int heightDiff = screenHeight - (r.bottom - r.top);
        boolean isVisible = heightDiff > screenHeight * 0.15;

        if (isVisible != isKeyboardVisible) {
            isKeyboardVisible = isVisible;
            onKeyboardVisibilityListener.onVisibilityChanged(isVisible);
        }
    }
}

在需要监听键盘显示/隐藏事件的Activity中，使用上述监听器类：

public class MainActivity extends AppCompatActivity implements KeyboardVisibilityListener.OnKeyboardVisibilityListener {
    private View rootView;

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

        rootView = findViewById(android.R.id.content);
        KeyboardVisibilityListener keyboardVisibilityListener = new KeyboardVisibilityListener(rootView, this);
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(keyboardVisibilityListener);
    }

    @Override
    public void onVisibilityChanged(boolean isVisible) {
        if (isVisible) {
            // 虚拟键盘显示
            // 在此处添加处理逻辑
        } else {
            // 虚拟键盘隐藏
            // 在此处添加处理逻辑
        }
    }
}

通过上述方法，我们可以在Android中捕获"虚拟键盘显示/隐藏"事件，并在相应的回调方法中处理相关逻辑。

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