Camera is not working in Nougat 7.0

Question

My camera code is working in all Android versions but in Nougat 7.0 it gives the following error:

java.lang.NullPointerException: Attempt to invoke virtual meth         


        

Answer 1

I have done image uploading to server using camera for android api >21

import android.Manifest;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Random;


public class MainActivity extends AppCompatActivity implements         View.OnClickListener {

private static final int PICK_FILE_REQUEST = 1;
private static final String TAG = MainActivity.class.getSimpleName();
private ArrayList selectedFilePath;
private String SERVER_URL =     "http://192.168.1.10:8080/imageUploadWebApi.php";
Button btAttachment;
Button btCamera;
Button bUpload;
TextView tvFileName;
ProgressDialog dialog;
public static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 123;
Uri outputFileUri;
String mCurrentPhotoPath;


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

    int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
    } else {
        Init();
    }

    if ( Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission( this, android.Manifest.permission.CAMERA ) != PackageManager.PERMISSION_GRANTED) {
        requestPermissions(new String[]{android.Manifest.permission.CAMERA},
                MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
            if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                Init();
            }
            break;
        default:
            break;
    }
}

private void Init() {
    btAttachment = (Button)findViewById(R.id.btAttachment);
    btCamera=(Button)findViewById(R.id.btCamera);
    bUpload = (Button) findViewById(R.id.b_upload);
    tvFileName = (TextView) findViewById(R.id.tv_file_name);
    btAttachment.setOnClickListener(this);
    btCamera.setOnClickListener(this);
    bUpload.setOnClickListener(this);
    selectedFilePath=new ArrayList<>();
}

@Override
public void onClick(View v) {

    switch (v.getId())
    {
        case R.id.btAttachment:
            if(selectedFilePath.size()<5) {
                //on attachment icon click
                showFileChooser();
            }
            else
                Toast.makeText(this,"You can upload only 5 Images at a time ",Toast.LENGTH_LONG).show();

            break;

        case R.id.btCamera:
            if(selectedFilePath.size()<5) {
                try {

                    Intent cameraIntent= new Intent(
                            android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                        cameraIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                        outputFileUri = FileProvider.getUriForFile(getApplicationContext(), BuildConfig.APPLICATION_ID + ".provider", createImageFile());
                        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                    } else {
                        File imagesFolder = new File(Environment.getExternalStorageDirectory(), "Images");
                        imagesFolder.mkdirs()
                        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                        String imageFileName = "Img_" + timeStamp;
                        String fname =  imageFileName + ".png";
                        File file = new File(imagesFolder, fname);
                        outputFileUri = Uri.fromFile(file);
                        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                    }

                    startActivityForResult(cameraIntent, 100);
                }catch(Exception e) {
                    e.printStackTrace();
                }
            }
            else
                Toast.makeText(this,"You can upload only 5 Images at a time ",Toast.LENGTH_LONG).show();
            break;

        case R.id.b_upload:
            selectedFile();
            break;

    }
        }

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "Img_" + timeStamp;
    File storageDir = new File(Environment.getExternalStorageDirectory(), "Images");
    File file=new File(storageDir,imageFileName+".png");
    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = file.getAbsolutePath();//"file:" + image.getAbsolutePath();
    return file;
}

private void selectedFile()
{
    if(selectedFilePath.size() != 0){
        dialog = ProgressDialog.show(MainActivity.this,"","Uploading File...",true);

        for (final String selectedFile:selectedFilePath) {

            new Thread(new Runnable() {
                @Override
                public void run() {
                    //creating new thread to handle Http Operations
                    uploadFile(selectedFile);
                }
            }).start();
        }
    }else{
        Toast.makeText(MainActivity.this,"Please choose a File First", Toast.LENGTH_SHORT).show();
    }
}

private void showFileChooser() {
    Intent intent = new Intent();
    //sets the select file to all types of files
    intent.setType("*/*");
    //allows to select data and return it
    intent.setAction(Intent.ACTION_GET_CONTENT);
    //starts new activity to select file and return data
    startActivityForResult(Intent.createChooser(intent,"Choose File to Upload.."),PICK_FILE_REQUEST);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == Activity.RESULT_OK){
        if(requestCode == PICK_FILE_REQUEST){
            if(data == null){
                //no data present
                return;
            }

            Uri selectedFileUri =data.getData();
            selectedFilePath.add(FilePath.getPath(this,selectedFileUri));
            Log.i(TAG,"Selected File Path:" + selectedFilePath);

            if(selectedFilePath.size() != 0 ){
                String fileName="";
                for(int i=0;i 0){
                //write the bytes read from inputstream
                dataOutputStream.write(buffer,0,bufferSize);
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable,maxBufferSize);
                bytesRead = fileInputStream.read(buffer,0,bufferSize);
            }

            dataOutputStream.writeBytes(lineEnd);
            dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

            serverResponseCode = connection.getResponseCode();
            String serverResponseMessage = connection.getResponseMessage();

            Log.i(TAG, "Server Response is: " + serverResponseMessage + ": " + serverResponseCode);

            //response code of 200 indicates the server status OK
            if(serverResponseCode == 200){
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        tvFileName.setText("File Upload completed.");
                    }
                });
            }

            //closing the input and output streams
            fileInputStream.close();
            dataOutputStream.flush();
            dataOutputStream.close();
            this.selectedFilePath.clear();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(MainActivity.this,"File Not Found",Toast.LENGTH_SHORT).show();
                }
            });
        } catch (MalformedURLException e) {
            e.printStackTrace();
            Toast.makeText(MainActivity.this, "URL error!", Toast.LENGTH_SHORT).show();

        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(MainActivity.this, "Cannot Read/Write File!", Toast.LENGTH_SHORT).show();
        }
        dialog.dismiss();

        return serverResponseCode;
    }

}
     }

it is working with android nougat.