android - 从 webview INPUT 字段上传相机照片和文件选择器

Question

我的应用程序是基于网络的，我需要上传来自 INPUT 野外营地的图片。我有两种情况，因为我不知道另一种方法，具体取决于页面，我根据其 URL 请愿书选择一个或另一个带有“boolean boolFileChoser”的页面:

一个。文件选择器

相机拍照。

我已经处理了文件选择器并且它完美地上传了文件， 问题出在相机上。一旦我尝试上传相机图片，它就会崩溃。据我所知，这是因为 URI。

a) 文件选择器:content://media/external/images/1234

b) 相机拍摄:file:///mnt/sdcard/Pic.jpg

我找不到改变它的方法。

查看更新

它现在因为在尝试上传“content://media/external/images/1234”时出现空指针异常而崩溃。 (仅适用于相机，不适用于文件选择器。)。此外，如果选择器/相机关闭(后退按钮)，我将无法再次调用它。

情况 a) 和 b) 100% 工作，这里是工作代码，包括我如何知道是否调用了 fileChooser 或 camera:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (resultCode != RESULT_OK) {
    /** fixed code **/
            //To be able to use the filechooser again in case of error
            mUploadMessage.onReceiveValue(null);
    /** fixed code **/
            return;
    }
    if (mUploadMessage==null) {
        Log.d("androidruntime","no mUploadMessage");
        return;
    }
    if (requestCode == FILECHOOSER_RESULTCODE) {
        Uri selectedImage= intent == null || resultCode != RESULT_OK ? null : intent.getData();
        Log.d("androidruntime","url: "+selectedImage.toString());

    }else if (requestCode == CAMERAREQUEST_RESULTCODE) { 
        if(mCapturedImageURI==null){
            Log.d("androidruntime","no mCapturedImageURI");
            return;
        }
      /** fixed code **/
        getContentResolver().notifyChange(mCapturedImageURI, null);
        ContentResolver cr = getContentResolver();
        Uri uriContent= Uri.parse(MediaStore.Images.Media.insertImage(getContentResolver(), photo.getAbsolutePath(), null, null));
        photo = null;
      /** fixed code **/
    }
    mUploadMessage.onReceiveValue(selectedImage);
    mUploadMessage = null;
}


    private static final int FILECHOOSER_RESULTCODE   = 2888;
    private static final int CAMERAREQUEST_RESULTCODE = 1888;
    private ValueCallback<Uri> mUploadMessage;
    private Uri mCapturedImageURI = null;

    protected class AwesomeWebChromeClient extends WebChromeClient{
        // Per Android 3.0+
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType){  
           /**updated, out of the IF **/
                            mUploadMessage = uploadMsg;
           /**updated, out of the IF **/
            if(boolFileChooser){ //Take picture from filechooser

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
                i.addCategory(Intent.CATEGORY_OPENABLE);  
                i.setType("image/*");  
                MainActivity.this.startActivityForResult( Intent.createChooser( i, "Escoger Archivo" ), MainActivity.FILECHOOSER_RESULTCODE );  

            } else { //Take photo and upload picture
                Intent cameraIntent = new Intent("android.media.action.IMAGE_CAPTURE");
                File photo = new File(Environment.getExternalStorageDirectory(),  "Pic.jpg");
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                        Uri.fromFile(photo));
                mCapturedImageURI = Uri.fromFile(photo);
                startActivityForResult(cameraIntent, MainActivity.CAMERA_REQUEST);
            }
        }
        // Per Android < 3.0
        public void openFileChooser(ValueCallback<Uri> uploadMsg){
            openFileChooser(uploadMsg, "");
        }
        //Altre
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
            openFileChooser(uploadMsg, "");
        }



        /** Added code to clarify chooser. **/

        //The webPage has 2 filechoosers and will send a console message informing what action to perform, taking a photo or updating the file
        public boolean onConsoleMessage(ConsoleMessage cm) {        
            onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
            return true;
        }
        public void onConsoleMessage(String message, int lineNumber, String sourceID) {
            Log.d("androidruntime", "Per cònsola: " + cm.message());
            if(message.endsWith("foto")){ boolFileChooser= true; }
            else if(message.endsWith("pujada")){ boolFileChooser= false; }
        }
        /** Added code to clarify chooser. **/



    }

---

更新 1

我可以获得“content://media/external/images/xxx”uri 格式，但应用程序在尝试通过“mUploadMessage.onReceiveValue(selectedImage);”上传 uri 时仍然崩溃。现在我遇到了空指针异常。

---

更新 2

已修复并正常工作。

我只在文件选择器的情况下在局部变量中有'ValueCallback uploadMsg'，所以当我尝试上传照片文件时它总是抛出一个异常，因为它是空的。一旦我从 if-else 语句中取出，一切正常。之前的更新是处理文件上传最简单的方法。

我已经添加了一个“mUploadMessage.onReceiveValue(null);”如果 Camera/filechooser intent 被取消(你必须在你的网页中处理它)，否则你将无法再次启动 INPUT 字段(Intent)。

---

更新 3

在 AwesomeChromeClient 中添加了部分代码来区分选项、拍照或选择文件..这是我的做法并通过请愿添加，我相信还有很多其他有效的方法做，

代码现在功能 100%。如果你指出你是想要图片还是文件选择器

Answer 1

这就是我从 WebView 输入字段实现相机上传和文件选择器的方式:

下面是这个重要主题的代码。不相关的代码被删除。

public class MainActivity extends Activity {

private WebView webView;
private String urlStart = "http://www.example.com/mobile/";

//File choser parameters
private static final int FILECHOOSER_RESULTCODE   = 2888;
private ValueCallback<Uri> mUploadMessage;

//Camera parameters
    private Uri mCapturedImageURI = null;

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

    webView = (WebView) findViewById(R.id.webView);

    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setLoadWithOverviewMode(true);

    webView.getSettings().setAllowFileAccess(true);

    webView.loadUrl(urlStart);

    webView.setWebChromeClient(new WebChromeClient() {
        // openFileChooser for Android 3.0+
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) { 

            mUploadMessage = uploadMsg;

            try{
                Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                File externalDataDir = Environment.getExternalStoragePublicDirectory(
                          Environment.DIRECTORY_DCIM);
                File cameraDataDir = new File(externalDataDir.getAbsolutePath() +
                          File.separator + "browser-photos");
                cameraDataDir.mkdirs();
                String mCameraFilePath = cameraDataDir.getAbsolutePath() + File.separator +
                          System.currentTimeMillis() + ".jpg";
                mCapturedImageURI = Uri.fromFile(new File(mCameraFilePath));

                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);

                Intent i = new Intent(Intent.ACTION_GET_CONTENT); 
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");

                Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[] { cameraIntent });

                startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
              }
             catch(Exception e){
                 Toast.makeText(getBaseContext(), "Camera Exception:"+e, Toast.LENGTH_LONG).show();
             }
           }

        // For Android < 3.0
       @SuppressWarnings("unused")
    public void openFileChooser(ValueCallback<Uri> uploadMsg ) {
               openFileChooser(uploadMsg, "");
           }

    // For Android  > 4.1.1
        @SuppressWarnings("unused")
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){
               openFileChooser(uploadMsg, acceptType);
           }



           public boolean onConsoleMessage(ConsoleMessage cm) {        
               onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
               return true;
           }
           public void onConsoleMessage(String message, int lineNumber, String sourceID) {
               Log.d("androidruntime", "www.example.com: " + message);
             }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    // TODO Auto-generated method stub
    if(requestCode==FILECHOOSER_RESULTCODE)  
     {  

            if (null == this.mUploadMessage) {
                return;
            }

           Uri result=null;

           try{
                if (resultCode != RESULT_OK) {

                    result = null;

                } else {

                    // retrieve from the private variable if the intent is null
                    result = intent == null ? mCapturedImageURI : intent.getData(); 
                } 
            }
            catch(Exception e)
            {
                Toast.makeText(getApplicationContext(), "activity :"+e, Toast.LENGTH_LONG).show();
            }

            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;

     }
}

希望对大家有帮助:)