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Android Webview upload 图片上传

导读:

Android HTML 打开相册上传照片

扩充 webview 防止js注入

解决 android webview 在4.4系统上无法使用情况

文章分为3部分: android 4.4 系统 、 非android 4.4 系统 和 代码混淆

第一部分 通用解决方法

1 在使用web view的activity类中添加onActivityResult

public static final int REQUEST_SELECT_FILE = 100;    public final static int FILECHOOSER_RESULTCODE = 1;    public ValueCallback
   
     uploadMessage;    public ValueCallback
    
      mUploadMessage;    public ProgressBar mWebLoadingProgressBar;    @SuppressLint("NewApi")    @Override    public 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;        } else if (requestCode == REQUEST_SELECT_FILE) {            if (uploadMessage == null) return;            uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));            uploadMessage = null;        }    }
    
   

2  设置webview 的 WebViewClient

mWebView.setWebChromeClient(new SafeWebViewClient());

3  扩展WebViewClient 的 SafeWebViewClient 

public class SafeWebViewClient extends WebViewClient {        @Override        public void onProgressChanged(WebView view, int newProgress) {            super.onProgressChanged(view, newProgress);            activity.mWebLoadingProgressBar.setProgress(newProgress);            if (newProgress >= 90 && activity.mWebLoadingProgressBar.getVisibility() == View.VISIBLE) {                activity.mWebLoadingProgressBar.setVisibility(View.GONE);            }        }        //The undocumented magic method override        //Eclipse will swear at you if you try to put @Override here        // For Android 3.0+        public void openFileChooser(ValueCallback
   
     uploadMsg) {            activity.mUploadMessage = uploadMsg;            Intent i = new Intent(Intent.ACTION_GET_CONTENT);            i.addCategory(Intent.CATEGORY_OPENABLE);            i.setType("image/*");            activity.startActivityForResult(Intent.createChooser(i, "File Chooser"), activity.FILECHOOSER_RESULTCODE);        }        // For Android 3.0+        public void openFileChooser(ValueCallback uploadMsg, String acceptType) {            activity.mUploadMessage = uploadMsg;            Intent i = new Intent(Intent.ACTION_GET_CONTENT);            i.addCategory(Intent.CATEGORY_OPENABLE);            i.setType("*/*");            activity.startActivityForResult(Intent.createChooser(i, "File Browser"), activity.FILECHOOSER_RESULTCODE);        }        //For Android 4.1        public void openFileChooser(ValueCallback
    
      uploadMsg, String acceptType, String capture) {            activity.mUploadMessage = uploadMsg;            Intent i = new Intent(Intent.ACTION_GET_CONTENT);            i.addCategory(Intent.CATEGORY_OPENABLE);            i.setType("image/*");            activity.startActivityForResult(Intent.createChooser(i, "File Chooser"), activity.FILECHOOSER_RESULTCODE);        }        //For Android 5.0        @TargetApi(Build.VERSION_CODES.LOLLIPOP)        public boolean onShowFileChooser(WebView webView, ValueCallback
     
       filePathCallback, FileChooserParams fileChooserParams) {            // make sure there is no existing message            if (activity.uploadMessage != null) {                activity.uploadMessage.onReceiveValue(null);                activity.uploadMessage = null;            }            activity.uploadMessage = filePathCallback;            Intent intent = fileChooserParams.createIntent();            try {                activity.startActivityForResult(intent, activity.REQUEST_SELECT_FILE);            } catch (ActivityNotFoundException e) {                activity.uploadMessage = null;                return false;            }            return true;        }    }
     
    
   

第二部分 Android 4.4 系统

Android 4.4系统的webview 被禁掉了 需要使用js和android接口互调的形式

JS通过接口调用 android native的方法 , 由android 上传图片 ,成功后获取服务器返回的URL地址 ,

再由android webview调用JS接口 将图片的URL 传给JS显示

如图:

第三部分 代码混淆

在混淆文件中添加

-keepclassmembers class * extends android.webkit.WebChromeClient {   public void openFileChooser(...);}

Android studio 用户混淆文件:    proguard-rules.pro 

eclipse 用户混淆文件:                proguard-android.txt 

附:

JavaScript 调用android图片上传例子:

   
    File to upload: 
      
     to upload the file!
   

参考技术贴:

http://stackoverflow.com/questions/5907369/file-upload-in-webview/

Demo下载地址:

http://download.csdn.net/detail/aaawqqq/9485280

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