CouponActivity.java

package bd.com.bahadur.bahadurmerchant;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class CouponActivity extends AppCompatActivity {
    private final String TAG = getClass().getSimpleName();
    private final static int FCR = 1;
    private WebView webView;

    private String mCM;
    private ValueCallback<Uri> mUM;
    private ValueCallback<Uri[]> mUMA;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_coupon);

        webView = findViewById(R.id.myWeb);

        if (Build.VERSION.SDK_INT >= 23 && (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)) {
            ActivityCompat.requestPermissions(CouponActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA}, 1);
        }
        assert webView != null;

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setAllowFileAccess(true);

//        webView.getSettings().setSupportZoom(true);
//        webView.getSettings().setBuiltInZoomControls(true);

        webView.loadUrl("https://api.bahadur.com.bd/public/");
        webView.setWebViewClient(new Callback());

        if (Build.VERSION.SDK_INT >= 21) {
            webSettings.setMixedContentMode(0);
            webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
        } else if (Build.VERSION.SDK_INT >= 19) {
            webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
        } else if (Build.VERSION.SDK_INT < 19) {
            webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }

        webView.setWebChromeClient(new WebChromeClient() {

            //For Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {

                mUM = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("*/*");
                CouponActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FCR);
            }

            // For Android 3.0+, above method not supported in some android 3+ versions, in such case we use this
            public void openFileChooser(ValueCallback uploadMsg, String acceptType) {

                mUM = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("*/*");
                CouponActivity.this.startActivityForResult(Intent.createChooser(i, "File Browser"), FCR);
            }

            //For Android 4.1+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {

                mUM = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("*/*");
                CouponActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), CouponActivity.FCR);
            }

            //For Android 5.0+
            public boolean onShowFileChooser(
                    WebView webView, ValueCallback<Uri[]> filePathCallback,
                    WebChromeClient.FileChooserParams fileChooserParams) {

                if (mUMA != null) {
                    mUMA.onReceiveValue(null);
                }

                mUMA = filePathCallback;
                // Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);


                Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
                contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
                contentSelectionIntent.setType("*/*");
//                Intent[] intentArray;
//
//                if (takePictureIntent != null) {
//                    intentArray = new Intent[]{takePictureIntent};
//                } else {
//                    intentArray = new Intent[0];
//                }

                Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
                chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
                // chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
                // chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
                startActivityForResult(chooserIntent, FCR);
                return true;
            }
        });
    }

    public class Callback extends WebViewClient {
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            Toast.makeText(getApplicationContext(), "Failed loading app!", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onBackPressed() {
        if(webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }

}