FoamyGuy的第一个答案是正确的，但我有一些补充;低声誉不允许我发表评论。如果由于某些原因您的页面加载失败，请确保您设置了一个标记来记录失败，然后在onBackPressed覆盖上检查它。否则，你的canGoBack()将永远执行而不前往实际的back活动，如果它在那里:

//flag with class wide access 
public boolean ploadFailFlag = false;

//your error handling override
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
    onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
    ploadFailFlag = true;       //note this change 
    .....
    .....
}

//finally to the answer to this question:
@Override
public void onBackPressed() {
    if(checkinWebView.canGoBack()){
        //if page load fails, go back for web view will not go back - no page to go to - yet overriding the super 
        if(ploadFailFlag){
            super.onBackPressed();
        }else {
            checkinWebView.goBack();
        }
    }else {
        Toast.makeText(getBaseContext(), "super:", Toast.LENGTH_LONG).show();
        super.onBackPressed();
    }
}

我想我有点晚了，但根据android文档，你可以有自定义反向导航在碎片内完成以下一段代码。

 requireActivity().onBackPressedDispatcher.addCallback(this) {
            // Handle the back button event
            if (binding.webView.canGoBack()){
                binding.webView.goBack()
            } else {
                findNavController().popBackStack()
            }
        }

你可以自定义什么做，当你的webView不能返回根据你的需要。

完整的参考下一个按钮和进度条:放回和下一个按钮在webview

如果你想在点击手机的后退按钮时回到后退页，使用这个:

@Override
public void onBackPressed() {
    if (webView.canGoBack()) {
        webView.goBack();
    } else {
        super.onBackPressed();
    }
} 

你也可以像这样创建自定义后退按钮:

btnback.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            if (wv.canGoBack()) {
                wv.goBack();
            }
        }
    }); 

下面是Kotlin的解决方案:

override fun onKeyUp(keyCode: Int, event: KeyEvent?): Boolean {
    if (event?.action != ACTION_UP || event.keyCode != KEYCODE_BACK) {
        return super.onKeyUp(keyCode, event)
    }

    if (mWebView.canGoBack()) {
        mWebView.goBack()
    } else {
        finish()
    }
    return true
}

FoamyGuy的第一个答案是正确的，但我有一些补充;低声誉不允许我发表评论。如果由于某些原因您的页面加载失败，请确保您设置了一个标记来记录失败，然后在onBackPressed覆盖上检查它。否则，你的canGoBack()将永远执行而不前往实际的back活动，如果它在那里:

//flag with class wide access 
public boolean ploadFailFlag = false;

//your error handling override
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
    onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
    ploadFailFlag = true;       //note this change 
    .....
    .....
}

//finally to the answer to this question:
@Override
public void onBackPressed() {
    if(checkinWebView.canGoBack()){
        //if page load fails, go back for web view will not go back - no page to go to - yet overriding the super 
        if(ploadFailFlag){
            super.onBackPressed();
        }else {
            checkinWebView.goBack();
        }
    }else {
        Toast.makeText(getBaseContext(), "super:", Toast.LENGTH_LONG).show();
        super.onBackPressed();
    }
}

如果有人想在片段中处理webView的backPressed，那么他可以使用下面的代码。

Copy below code into your Activity class (that contains a fragment YourFragmmentName) @Override public void onBackPressed() { List<Fragment> fragmentList = getSupportFragmentManager().getFragments(); boolean handled = false; for(Object f: fragmentList) { if(f instanceof YourFragmentName) { handled = ((YourFragmentName)f).onBackPressed(); if(handled) { break; } } } if(!handled) { super.onBackPressed(); } } Copy this code in the fragment YourFragmentName public boolean onBackPressed() { if (webView.canGoBack()) { webView.goBack(); return true; } else { return false; } }

笔记

Activity应该替换为您正在使用的实际Activity类。 YourFragmentName应该替换为Fragment的名称。 在YourFragmentName中声明webView，以便可以从函数中访问它。