[移动开发]WebView长按选中获取内容

修改webview

package com.whsz.mywebtest;

import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.JavascriptInterface;
import android.webkit.WebView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by guoshuyu on 2017/6/16.
 */

public class CustomActionWebView extends WebView {

    static String TAG = "CustomActionWebView";

    ActionMode mActionMode;

    List<String> mActionList = new ArrayList<>();

    ActionSelectListener mActionSelectListener;

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

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

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


    /**
     * 处理item，处理点击
     * @param actionMode
     */
    private ActionMode resolveActionMode(ActionMode actionMode) {
        if (actionMode != null) {
            final Menu menu = actionMode.getMenu();
            mActionMode = actionMode;
            menu.clear();
            for (int i = 0; i < mActionList.size(); i++) {
                menu.add(mActionList.get(i));
            }
            for (int i = 0; i < menu.size(); i++) {
                MenuItem menuItem = menu.getItem(i);
                menuItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        getSelectedData((String) item.getTitle());
                        releaseAction();
                        return true;
                    }
                });
            }
        }
        mActionMode = actionMode;
        return actionMode;
    }

    @Override
    public ActionMode startActionMode(ActionMode.Callback callback) {
        ActionMode actionMode = super.startActionMode(callback);
        return resolveActionMode(actionMode);
    }

    @Override
    public ActionMode startActionMode(ActionMode.Callback callback, int type) {
        ActionMode actionMode = super.startActionMode(callback, type);
        return resolveActionMode(actionMode);
    }

    private void releaseAction() {
        if (mActionMode != null) {
            mActionMode.finish();
            mActionMode = null;
        }
    }

    /**
     * 点击的时候，获取网页中选择的文本，回掉到原生中的js接口
     * @param title 传入点击的item文本，一起通过js返回给原生接口
     *IE9以下支持：document.selection 　　
     * IE9、Firefox、Safari、Chrome和Opera支持：window.getSelection()
     */
    private void getSelectedData(String title) {

        String js = "(function getSelectedText() {" +
                "var txt1 =window.getSelection().getRangeAt(0).startContainer.data;" +
                "var txt2 =window.getSelection().toString();" +
                "var title = \"" + title + "\";" +
                "JSInterface.callback(txt1,txt2,title);" +
                "})()";
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            evaluateJavascript("javascript:" + js, null);
        } else {
            loadUrl("javascript:" + js);
        }
    }

    public void linkJSInterface() {
        addJavascriptInterface(new ActionSelectInterface(this), "JSInterface");
    }

    /**
     * 设置弹出action列表
     * @param actionList
     */
    public void setActionList(List<String> actionList) {
        mActionList = actionList;
    }

    /**
     * 设置点击回掉
     * @param actionSelectListener
     */
    public void setActionSelectListener(ActionSelectListener actionSelectListener) {
        this.mActionSelectListener = actionSelectListener;
    }

    /**
     * 隐藏消失Action
     */
    public void dismissAction() {
        releaseAction();
    }


    /**
     * js选中的回掉接口
     */
    private class ActionSelectInterface {

        CustomActionWebView mContext;

        ActionSelectInterface(CustomActionWebView c) {
            mContext = c;
        }

        @JavascriptInterface
        public void callback(final String parentText, final String value, final String title) {
            if(mActionSelectListener != null) {
                mActionSelectListener.onClick(title, value,parentText);
            }
        }
    }
}

package com.whsz.mywebtest;

public interface ActionSelectListener {
    void onClick(String title,String parentText, String selectText);
}

使用

package com.whsz.mywebtest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {


    CustomActionWebView mWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWebView = findViewById(R.id.webview);

        List<String> list = new ArrayList<>();
//        list.add("复制");
//        list.add("分享");
        list.add("批注");
        //设置item
        mWebView.setActionList(list);

        //链接js注入接口，使能选中返回数据
        mWebView.linkJSInterface();

        //增加点击回调
        mWebView.setActionSelectListener((title, selectText,parent) -> {
            String info = "内容: " + selectText+ "。\n段落: " + parent;
            Toast.makeText(this, info, Toast.LENGTH_LONG).show();
        });

// 开启javascript 渲染
        WebSettings webSettings = mWebView.getSettings();


        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);

        webSettings.setUseWideViewPort(true);//关键点

        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);

        webSettings.setDisplayZoomControls(false);

        webSettings.setJavaScriptEnabled(true); // 设置支持javascript脚本

        webSettings.setAllowFileAccess(true); // 允许访问文件

        webSettings.setBuiltInZoomControls(true); // 设置显示缩放按钮

        webSettings.setSupportZoom(true); // 支持缩放

        webSettings.setLoadWithOverviewMode(true);


        mWebView.setWebViewClient(new WebViewClient());

        // 载入内容
//        mWebView.loadUrl("file:///android_asset/111.html");

        mWebView.loadData("qweweeeeeeeeeeqewq","text/html","utf-8");
    }

}

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