Android 长按网页选中文字的弹出菜单的自定义

如果想定制Android 长按网页选中文字的弹出菜单；可以使用下面方法。
在Android WebView中定制长按网页选择文字的菜单，需要使用到Android的ActionMode和ActionMode.Callback。以下是一个基本的示例，展示了如何通过重写WebView的startActionMode方法来实现自定义的选择菜单：

创建一个自定义的WebView类，重写startActionMode方法。

package acr.browser.lightning;

import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;

import androidx.annotation.RequiresApi;

import acr.browser.lightning.utils.ComUtils;

public class CustomWebView extends WebView {
    public CustomWebView(Context context) {
        super(context);
    }

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

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


    @Override
    public ActionMode startActionMode(ActionMode.Callback callback, int type) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            ActionMode.Callback wrappedCallback = new CustomActionModeCallback(callback);
            return super.startActionMode(wrappedCallback, type);
        } else {
            return super.startActionMode(callback, type);
        }
    }


    @RequiresApi(api = Build.VERSION_CODES.M)
    private class CustomActionModeCallback extends ActionMode.Callback2 {
        private final ActionMode.Callback originalCallback;

        @Override
        public void onGetContentRect(ActionMode mode, View view, Rect outRect) {
            if (originalCallback instanceof ActionMode.Callback2) {
                ((ActionMode.Callback2) originalCallback).onGetContentRect(mode, view, outRect);
            }
        }

        public CustomActionModeCallback(ActionMode.Callback originalCallback) {
            this.originalCallback = originalCallback;
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            // 自定义菜单可以用这下方法
//            menu.clear();
//            menu.add(0, Menu.FIRST, 0, "自定义项1");
//            return true;
            // 返回false表示不创建任何菜单项，返回true表示接受原始菜单项
            return originalCallback.onCreateActionMode(mode, menu);
        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return originalCallback.onPrepareActionMode(mode, menu);
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            Log.i("TAG", "onActionItemClicked: item id:"
                    + item.getItemId() + "; " + item.getTitle()+"; "
                    +ComUtils.getContext().getResources().getResourceEntryName(item.getItemId())
                    +"; "+ComUtils.getContext().getResources().getResourcePackageName(item.getItemId()));

            if (item.getItemId() == ComUtils.getContext().getResources().getIdentifier("select_action_menu_share","id", "com.google.android.webview")) {
                ComUtils.showMsg("分享文字");
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    evaluateJavascript("(function(){return window.getSelection().toString();})()",
                            value -> Log.i("TAG", "onReceiveValue: html:"+ value.substring(1,value.length()-1)));
                }
                mode.finish();
                return true;
            }
            return originalCallback.onActionItemClicked(mode, item);
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            originalCallback.onDestroyActionMode(mode);
        }
    }


    // 解码JSON字符串并去除引号
    private static String unescapeJavaString(String st) {
        StringBuilder sb = new StringBuilder(st.length());
        for (int i = 1; i < st.length() - 1; i++) {
            char ch = st.charAt(i);
            if (ch == '\\' && i < st.length() - 1) {
                char nextChar = st.charAt(i + 1);
                if (nextChar == 'u') {
                    // 读取unicode字符
                    sb.append((char) Integer.parseInt(st.substring(i + 2, i + 6), 16));
                    i += 5;
                } else {
                    // 对于其他转义字符，直接添加它们的字面值
                    sb.append(nextChar);
                    i++;
                }
            } else {
                sb.append(ch);
            }
        }
        return sb.toString();
    }
}