Android WebView 上传图片文件有坑

转自：http://blog.csdn.net/dsb2008dsb/article/details/71713465

首先说下这个坑是怎么来的，本来要在项目中集成一个第三方提供的功能，但是第三方没有SDK，只给了个H5的页面，只能用webview给套进去了，本来以为事情很简单，分分钟的事情，可是页面里面竟然有图片上传的功能，这也没啥，网上找了段代码加上就OK了，可是本人的手机就是掉不起来文件选择对话框，谷歌和百度一番之后，坑出现了，并且对我这个情况无解，那就是安卓版本4.4、4.4.1、4.4.2这几个版本不被支持，除非H5是自己写的，可以Cordova实现，挖坑的就是谷歌这货自己。谁看到了这个文章，并且有解决办法，可以回复我，本人感激不尽。最后，上点源码，调试过的，谁想用可以直接拿去（包含了cookie处理），但是记得判断安卓版本号，源码如下：

 public class KengActivity extends BaseActivity implements View.OnClickListener {

     private WebView webView;
     private ImageView ivBack;
     private String url;

     public final static int FILECHOOSER_RESULTCODE = 1;
     public final static int FILECHOOSER_RESULTCODE_FOR_ANDROID_5 = 2;
     public ValueCallback mUploadMessage;
     public ValueCallback mUploadMessageForAndroid5;

     @Override
     public void onCreateActivity() {
         setContentView(R.layout.activity_lanjingling_pay);
     }

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         EventBus.getDefault().register(this);
         url = getIntent().getExtras().getString("url");
         initView();
         initData();
     }

     private void initView() {
         webView = (WebView) findViewById(R.id.webView);
         ivBack = (ImageView) findViewById(R.id.ivBack);
     }

     private void initData() {

         WebSettings webViewSettings = webView.getSettings();
         webViewSettings.setJavaScriptEnabled(true);
         webViewSettings.setSupportZoom(false);
         webViewSettings.setBuiltInZoomControls(false);
         webViewSettings.setAppCacheEnabled(false);
         webViewSettings.setLoadWithOverviewMode(true);
         webView.canGoBack();
         webView.setWebChromeClient(new MyWebChromeClient());
         /**
          * 设置webview支持https
          */
         webView.setWebViewClient(new WebViewClient() {
             public boolean shouldOverrideUrlLoading(WebView view, String url) {
                 return super.shouldOverrideUrlLoading(view, url);
             }

             @Override
             public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
                 handler.proceed();
             }
         });

         /**
          *  给webview跳转的url添加cookie
          */
         CookieSyncManager.createInstance(context);
         CookieManager cookieManager = CookieManager.getInstance();
         cookieManager.setAcceptCookie(true);

         PersistentCookieStore myCookieStore = new PersistentCookieStore(context);
         List cookies = myCookieStore.getCookies();
         for (int i = 0; i < cookies.size(); i++) {
             HttpCookie httpCookie = cookies.get(i);
             if (httpCookie.getName().equals("PHPSESSID")) {
                 cookieManager.setCookie(url, httpCookie.getName() + "=" + httpCookie.getValue());
             }
         }
         CookieSyncManager.getInstance().sync();
         webView.loadUrl(url);
         LoadingDialog.showProgressDialog(context);
     }


     private class MyWebChromeClient extends WebChromeClient {
         @Override
         public void onProgressChanged(WebView view, int newProgress) {
             if (newProgress == 100) {
                 LoadingDialog.closeProgressDialog();
             }
             super.onProgressChanged(view, newProgress);
         }

         public void openFileChooser(ValueCallback uploadMsg) {

             mUploadMessage = uploadMsg;
             Intent i = new Intent(Intent.ACTION_GET_CONTENT);
             i.addCategory(Intent.CATEGORY_OPENABLE);
             i.setType("image/*");
             KengActivity.this.startActivityForResult(
                     Intent.createChooser(i, "File Chooser"),
                     FILECHOOSER_RESULTCODE);

         }

         public void openFileChooser(ValueCallback uploadMsg,
                                     String acceptType) {
             mUploadMessage = uploadMsg;
             Intent i = new Intent(Intent.ACTION_GET_CONTENT);
             i.addCategory(Intent.CATEGORY_OPENABLE);
             i.setType("*/*");
             KengActivity.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/*");
             KengActivity.this.startActivityForResult(
                     Intent.createChooser(i, "File Chooser"),
                     FILECHOOSER_RESULTCODE);

         }

         @Override
         public boolean onShowFileChooser(WebView webView,
                                          ValueCallback filePathCallback,
                                          FileChooserParams fileChooserParams) {
             openFileChooserImplForAndroid5(filePathCallback);
             return true;//重要，没有这个会报错
         }
     }

     private void openFileChooserImplForAndroid5(ValueCallback uploadMsg) {
         mUploadMessageForAndroid5 = uploadMsg;
         Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
         contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
         contentSelectionIntent.setType("image/*");
         Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
         chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
         chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
         startActivityForResult(chooserIntent,
                 FILECHOOSER_RESULTCODE_FOR_ANDROID_5);
     }

     @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();
             if (result == null) {
                 mUploadMessage.onReceiveValue(result);
                 mUploadMessage = null;
                 return;
             }

             Bitmap bm = null;
             //外界的程序访问ContentProvider所提供数据 可以通过ContentResolver接口
             ContentResolver resolver = getContentResolver();
             try {
                 Uri originalUri = intent.getData(); // 获得图片的uri
                 bm = MediaStore.Images.Media.getBitmap(resolver, originalUri);
                 // 这里开始的第二部分，获取图片的路径：
                 String[] proj = {MediaStore.Images.Media.DATA};
                 // 好像是android多媒体数据库的封装接口，具体的看Android文档
                 Cursor cursor = managedQuery(originalUri, proj, null, null,null);
                 // 按我个人理解 这个是获得用户选择的图片的索引值
                 int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                 // 将光标移至开头 ，这个很重要，不小心很容易引起越界
                 cursor.moveToFirst();
                 // 最后根据索引值获取图片路径
                 String path = cursor.getString(column_index);
                 Uri uri = Uri.fromFile(new File(path));
                 mUploadMessage.onReceiveValue(uri);
             } catch (IOException e) {
                 Log.e("TAG-->Error", e.toString());
             }
         } else if (requestCode == FILECHOOSER_RESULTCODE_FOR_ANDROID_5) {
             if (null == mUploadMessageForAndroid5)
                 return;
             Uri result = (intent == null || resultCode != RESULT_OK) ? null: intent.getData();
             if (result != null) {
                 mUploadMessageForAndroid5.onReceiveValue(new Uri[]{result});
             } else {
                 mUploadMessageForAndroid5.onReceiveValue(new Uri[]{});
             }
             mUploadMessageForAndroid5 = null;
         }
     }
 }