Android, can't upload images using WebView

Question

I'm looking for a solution for some days for my problem but I can't find a good one. So I wanted to ask here again before I start developing a native app for Android since I can't solve this problem.

As the title says, I'm trying to upload an image by using webview to a html content which NORMALLY is choosing an image, showing it on the page and allowing user to crop it. I made whole app and had tested it on normal browser of my phone so I didn't know that this woulnd't work. That's why it's damn frustrating.

Those solutions which I've found on internet are not working for my Android and I read that it's nor possible anymore.

Does anyone know if this is possible or not? It would be a great help if I could get more informtions about this (even if it's possible or not?) Thanks in Adavnce...

Answer 1

Try adding these permissions.

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Android 6.0 Marshmallow introduces a new model for handling permissions, which streamlines the process for users when they install and upgrade apps. Provided you're using version 8.1 or later of Google Play services, you can configure your app to target the Android 6.0 Marshmallow SDK and use the new permissions model.

If your app supports the new permissions model, the user does not have to grant any permissions when they install or upgrade the app. Instead, the app must request permissions when it needs them at runtime, and the system shows a dialog to the user asking for the permission.

To learn more, see the documentation for Android 6.0 Marshmallow and the changes you must make to your app for the new permissions model.

Google has added WebChromeClient.onShowFileChooser. They even provide a way to automatically generate the file chooser intent so that it uses the input accept mime types.

Implement it in this way (from an answer by weiyin):

public class MyWebChromeClient extends WebChromeClient {
        // reference to activity instance. May be unnecessary if your web chrome client is member class.
    private MyActivity myActivity;

    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
        // make sure there is no existing message
        if (myActivity.uploadMessage != null) {
            myActivity.uploadMessage.onReceiveValue(null);
            myActivity.uploadMessage = null;
        }

        myActivity.uploadMessage = filePathCallback;

        Intent intent = fileChooserParams.createIntent();
        try {
            myActivity.startActivityForResult(intent, MyActivity.REQUEST_SELECT_FILE);
        } catch (ActivityNotFoundException e) {
            myActivity.uploadMessage = null;
            Toast.makeText(myActivity, "Cannot open file chooser", Toast.LENGTH_LONG).show();
            return false;
        }

        return true;
    }
}


public class MyActivity extends ... {
    public static final int REQUEST_SELECT_FILE = 100;
    public ValueCallback<Uri[]> uploadMessage;

    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        if (requestCode == REQUEST_SELECT_FILE) {
                if (uploadMessage == null) return;
                uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
                uploadMessage = null;
            }
        }
    }
}

Make sure to compile the app with API 21+. And this will work on all the platforms as you mention on your gradle.