帮我实现 Android之实现长按Webview页面文字自定义复制、全选、分享、搜索、翻译功能完整代码

好的，以下是实现长按Webview页面文字自定义复制、全选、分享、搜索、翻译功能的完整代码。

首先，需要在AndroidManifest.xml中添加以下权限：

<uses-permission android:name="android.permission.INTERNET"/>

接着，在布局文件中添加一个WebView：

<WebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

然后，在Java代码中获取WebView并设置长按监听器：

WebView webView = findViewById(R.id.webview);
registerForContextMenu(webView);
webView.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View v) {
        WebView.HitTestResult result = ((WebView) v).getHitTestResult();
        if (result.getType() == WebView.HitTestResult.UNKNOWN_TYPE) {
            return false;
        }
        openContextMenu(v);
        return true;
    }
});

接着，重写onCreateContextMenu方法，自定义菜单：

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);

    WebView.HitTestResult result = ((WebView) v).getHitTestResult();
    if (result.getType() == WebView.HitTestResult.TEXT_TYPE) {
        String selectedText = result.getExtra();

        // 复制
        MenuItem copyItem = menu.add("复制");
        copyItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
                ClipData clip = ClipData.newPlainText("text", selectedText);
                clipboard.setPrimaryClip(clip);
                return true;
            }
        });

        // 全选
        MenuItem selectAllItem = menu.add("全选");
        selectAllItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                webView.selectAll();
                return true;
            }
        });

        // 分享
        MenuItem shareItem = menu.add("分享");
        shareItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                Intent intent = new Intent(Intent.ACTION_SEND);
                intent.setType("text/plain");
                intent.putExtra(Intent.EXTRA_TEXT, selectedText);
                startActivity(Intent.createChooser(intent, "分享"));
                return true;
            }
        });

        // 搜索
        MenuItem searchItem = menu.add("搜索");
        searchItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
                intent.putExtra(SearchManager.QUERY, selectedText);
                startActivity(intent);
                return true;
            }
        });

        // 翻译
        MenuItem translateItem = menu.add("翻译");
        translateItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                String url = "https://translate.google.com/#view=home&op=translate&sl=auto&tl=en&text=" + selectedText;
                webView.loadUrl(url);
                return true;
            }
        });
    }
}

这样，长按WebView页面文字时就会弹出自定义的菜单，包含复制、全选、分享、搜索、翻译功能。

完整代码如下：

import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private WebView webView;

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

        webView = findViewById(R.id.webview);
        registerForContextMenu(webView);
        webView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                WebView.HitTestResult result = ((WebView) v).getHitTestResult();
                if (result.getType() == WebView.HitTestResult.UNKNOWN_TYPE) {
                    return false;
                }
                openContextMenu(v);
                return true;
            }
        });

        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });

        webView.loadUrl("https://www.baidu.com");
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        WebView.HitTestResult result = ((WebView) v).getHitTestResult();
        if (result.getType() == WebView.HitTestResult.TEXT_TYPE) {
            String selectedText = result.getExtra();

            // 复制
            MenuItem copyItem = menu.add("复制");
            copyItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
                    ClipData clip = ClipData.newPlainText("text", selectedText);
                    clipboard.setPrimaryClip(clip);
                    return true;
                }
            });

            // 全选
            MenuItem selectAllItem = menu.add("全选");
            selectAllItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    webView.selectAll();
                    return true;
                }
            });

            // 分享
            MenuItem shareItem = menu.add("分享");
            shareItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    Intent intent = new Intent(Intent.ACTION_SEND);
                    intent.setType("text/plain");
                    intent.putExtra(Intent.EXTRA_TEXT, selectedText);
                    startActivity(Intent.createChooser(intent, "分享"));
                    return true;
                }
            });

            // 搜索
            MenuItem searchItem = menu.add("搜索");
            searchItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
                    intent.putExtra(SearchManager.QUERY, selectedText);
                    startActivity(intent);
                    return true;
                }
            });

            // 翻译
            MenuItem translateItem = menu.add("翻译");
            translateItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    String url = "https://translate.google.com/#view=home&op=translate&sl=auto&tl=en&text=" + selectedText;
                    webView.loadUrl(url);
                    return true;
                }
            });
        }
    }
}