WebView复制粘贴文本

第一步，将下面的两个类复制到项目中：

    1.接口类：

/**
 * author: wu
 * date: on 2018/5/30.
 * describe:webView复制接口
 */

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

    2.工具类：

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 com.miaomi.miaomiao.interfaces.ActionSelectListener;

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

/**
 * author: wu
 * date: on 2018/5/30.
 * describe:webView复制文字
 */

public class CustomActionWebView extends WebView {

    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
     */
    private void getSelectedData(String title) {

        String js = "(function getSelectedText() {" +
                "var txt;" +
                "var title = \"" + title + "\";" +
                "if (window.getSelection) {" +
                "txt = window.getSelection().toString();" +
                "} else if (window.document.getSelection) {" +
                "txt = window.document.getSelection().toString();" +
                "} else if (window.document.selection) {" +
                "txt = window.document.selection.createRange().text;" +
                "}" +
                "JSInterface.callback(txt,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 value, final String title) {
            if(mActionSelectListener != null) {
                mActionSelectListener.onClick(title, value);
            }
        }
    }
}

第二步：xml 文件中应用：

<com.miaomi.miaomiao.utils.home.CustomActionWebView
    android:id="@+id/webView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

最后一步：在代码中添加：

List<String> list = new ArrayList<>();
list.add("复制");
webView.setWebViewClient(new CustomWebViewClient());
//设置item
webView.setActionList(list);
//链接js注入接口，使能选中返回数据
webView.linkJSInterface();
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setDisplayZoomControls(false);
//使用javascript
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setDomStorageEnabled(true);
//增加点击回调
webView.setActionSelectListener(new ActionSelectListener() {
    @Override
    public void onClick(String title, String selectText) {
        ToastUtil.show(mContext, "复制成功");
        // 为了兼容低版本我们这里使用旧版的android.text.ClipboardManager，虽然提示deprecated，但不影响使用。
        ClipboardManager cm = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
        // 将文本内容放到系统剪贴板里。
        cm.setText(selectText);
    }
});
webView.loadUrl(url);

private class CustomWebViewClient extends WebViewClient {

    private boolean mLastLoadFailed = false;

    @Override
    public void onPageFinished(WebView webView, String url) {
        super.onPageFinished(webView, url);
        if (!mLastLoadFailed) {
            CustomActionWebView customActionWebView = (CustomActionWebView) webView;
            customActionWebView.linkJSInterface();
        }
    }

    @Override
    public void onPageStarted(WebView webView, String url, Bitmap favicon) {
        super.onPageStarted(webView, url, favicon);
    }

    @Override
    public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
        super.onReceivedError(view, request, error);
        mLastLoadFailed = true;
    }
}

@Override
protected void onPause() {
    super.onPause();
    if(webView != null) {
        webView.dismissAction();
    }
}