Android：让WebView支持元素，实现文件上传
16lz
2021-01-25
最近在集成live800客服系统遇到了这样的问题：在h5页面点击“传送文件”按钮，没有任何反应。经过大量的资料查询，并与live800售后妹子沟通后，发现是Android原生webview控件的缺陷导致的。在Android中，当我们通过WebView打开一个页面时，如果里面有元素是类型的，WebView只能正常的显示样式，但是是无法点击的。要解决这个问题，我们需要重写WebChromeClient。
下面直接给出Demo代码：
public class MainActivity extends Activity{ private final String host = "demo.com"; private final String urlAddress = "http://" + host; private WebView web; private ProgressBar progressBar; private ValueCallback mUploadMessage; private final static int FILECHOOSER_RESULTCODE = 1; @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { if(requestCode == FILECHOOSER_RESULTCODE) { if(null == mUploadMessage) return; Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData(); mUploadMessage.onReceiveValue(result); mUploadMessage = null; } } /** * Called when the activity is first created. */ @SuppressLint("SetJavaScriptEnabled") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); web = (WebView) findViewById(R.id.webView1); progressBar = (ProgressBar) findViewById(R.id.progressBar1); WebSettings settings = web.getSettings(); settings.setJavaScriptEnabled(true); web.loadUrl(urlAddress); web.setWebViewClient(new MyWebViewClient()); web.setWebChromeClient(new WebChromeClient() { // 关键代码，以下函数是没有API文档的，所以在Eclipse中会报错，如果添加了@Override关键字在这里的话。 // For Android 3.0+ public void openFileChooser(ValueCallback uploadMsg) { mUploadMessage = uploadMsg; Intent i = new Intent(Intent.ACTION_GET_CONTENT); i.addCategory(Intent.CATEGORY_OPENABLE); i.setType("image/*"); MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE); } // For Android 3.0+ public void openFileChooser(ValueCallback uploadMsg, String acceptType) { mUploadMessage = uploadMsg; Intent i = new Intent(Intent.ACTION_GET_CONTENT); i.addCategory(Intent.CATEGORY_OPENABLE); i.setType("*/*"); MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE); } // For Android 4.1 public void openFileChooser(ValueCallback uploadMsg, String acceptType, String capture) { mUploadMessage = uploadMsg; Intent i = new Intent(Intent.ACTION_GET_CONTENT); i.addCategory(Intent.CATEGORY_OPENABLE); i.setType("image/*"); MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), MainActivity.FILECHOOSER_RESULTCODE); } }); // setContentView(web); } private class MyWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { if(Uri.parse(url).getHost().equals(host)) { // This is my web site, so do not override; let my WebView load // the page return false; } // Otherwise, the link is not for a page on my site, so launch // another Activity that handles URLs Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); startActivity(intent); return true; } @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { // TODO Auto-generated method stub super.onPageStarted(view, url, favicon); } @Override public void onPageFinished(WebView view, String url) { // TODO Auto-generated method stub super.onPageFinished(view, url); progressBar.setVisibility(View.GONE); } } // flipscreen not loading again @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); } // 捕捉"回退"按键，让WebView能回退到上一页，而不是直接关闭Activity。 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) { web.goBack(); return true; } return super.onKeyDown(keyCode, event); }}原文地址：http://www.szlive800.com/faq/20150323-allen/
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