How To Use Camera API For Android N And Above Devices In Android

 

Introduction

 

In my previous article, we learned how to handle “android.os.FileUriExposedException” if we have an app that shares files with other apps using a URI on API 24+. In this article, we will learn how to use Camera Intent in Android N and above devices.

 

Creating a New Project with Android Studio

1. Open Android Studio and select "Create new project".
2. Name the project as per your wish and select your activity template.
    
    
3. Click the “finish” button to create a new project in Android Studio.

Steps to use Camera API

• We already know how to open the camera from our app using intents. But for Android N & the above devices, Google has changed the approach for accessing the Camera API. In this step, we will see how to use Camera Intent for Pre Android N and Android N above devices. 
   
• Open your MainActivity.java file and add a button with a click event to open the Camera. The following code snippet shows the camera intent. 

  btnPickCamera.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
          // Checking Permission for Android M and above
          if (ActivityCompat.checkSelfPermission(MainActivity.this,
                  Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED
                  || ActivityCompat.checkSelfPermission(MainActivity.this,
                  Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
              ActivityCompat.requestPermissions(MainActivity.this,
                      new String[]{Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE}, PICK_FROM_CAMERA);
              return;
          }
  
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
              ContentValues values = new ContentValues(1);
              values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpg");
              outputFileUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
              Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
              captureIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
              captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
              startActivityForResult(captureIntent, PICK_FROM_CAMERA);
          } else {
              Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
              File file = new File(Environment.getExternalStorageDirectory(), "MyPhoto.jpg");
              outputFileUri = Uri.fromFile(file);
              captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
              startActivityForResult(captureIntent, PICK_FROM_CAMERA);
          }
      }
  });

• Here, I have added runtime permission checking for Android N and the above devices.

  ContentValues values = new ContentValues(1);
  values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpg");
  outputFileUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
  Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  captureIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION |       Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
  captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
  startActivityForResult(captureIntent, PICK_FROM_CAMERA);

• Here, we have created ContentValues and added MIME type as image. Then, created an output URI for the Camera API output image.
   
• Then, we have added flags “FLAG_GRANT_READ_URI_PERMISSION” and “FLAG_GRANT_WRITE_URI_PERMISSION” to allow the Camera API to take an image in Android N & above devices.
   
• We can retrieve the picked camera image by “onActivityResult” and the same as the old approach.

Full Code

 

The following code shows how to access an image from Gallery, how to take pictures from the camera, and how to open a file using intent in Android N & above devices.

public class MainActivity extends AppCompatActivity {

    ImageView imgPreview;
    TextView imgPath;
    Button btnPickCamera;
    Button btnPickGallery;
    Button btnOpenFile;

    Uri outputFileUri;
    private static final int PICK_FROM_CAMERA = 1;
    private static final int PICK_FROM_GALLERY = 2;

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

    private void initViews() {
        imgPreview = findViewById(R.id.imgPreview);
        imgPath = findViewById(R.id.imgPath);
        btnPickCamera = findViewById(R.id.btnCapture);
        btnPickGallery = findViewById(R.id.btnGallery);
        btnOpenFile = findViewById(R.id.btnOpenImg);
    }

    private void initOperations() {
        btnPickGallery.setOnClickListener(new View.OnClickListener() {
            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
            @Override
            public void onClick(View view) {
                // Checking Permission for Android M and above
                if (ActivityCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this,
                            new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, PICK_FROM_GALLERY);
                    return;
                }
                Intent galleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                // Start the Intent
                startActivityForResult(galleryIntent, PICK_FROM_GALLERY);
            }
        });

        btnPickCamera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Checking Permission for Android M and above
                if (ActivityCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED
                        || ActivityCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this,
                            new String[]{Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE}, PICK_FROM_CAMERA);
                    return;
                }

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    ContentValues values = new ContentValues(1);
                    values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpg");
                    outputFileUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
                    Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    captureIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                    startActivityForResult(captureIntent, PICK_FROM_CAMERA);
                } else {
                    Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    File file = new File(Environment.getExternalStorageDirectory(), "MyPhoto.jpg");
                    outputFileUri = Uri.fromFile(file);
                    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                    startActivityForResult(captureIntent, PICK_FROM_CAMERA);
                }
            }
        });

        btnOpenFile.setOnClickListener(new View.OnClickListener() {
            @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
            @Override
            public void onClick(View v) {
                // Checking Permission for Android M and above
                if (ActivityCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this,
                            new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, PICK_FROM_GALLERY);
                    return;
                }
                File file = new File(imgPath.getText().toString());
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    Uri apkURI = FileProvider.getUriForFile(getApplicationContext(), getPackageName() + ".provider", file);
                    intent.setDataAndType(apkURI, "image/jpg");
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                } else {
                    intent.setDataAndType(Uri.fromFile(file), "image/jpg");
                }
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Bitmap bitmap;
        switch (requestCode) {
            case PICK_FROM_CAMERA:
                if (resultCode == Activity.RESULT_OK) {

                    Uri selectedImage = outputFileUri;
                    ContentResolver cr = getContentResolver();
                    getContentResolver().notifyChange(selectedImage, null);
                    try {
                        bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, selectedImage);
                        int nh = (int) ( bitmap.getHeight() * (512.0 / bitmap.getWidth()) );
                        bitmap = Bitmap.createScaledBitmap(bitmap, 512, nh, true);
                        imgPreview.setImageBitmap(bitmap);
                        imgPath.setText(outputFileUri.getPath());
                    } catch (Exception e) {
                        Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT)
                                .show();
                    }
                }
                break;
            case PICK_FROM_GALLERY:
                if (resultCode == Activity.RESULT_OK) {
                    //pick image from gallery
                    Uri selectedImage = data.getData();
                    String[] filePathColumn = {MediaStore.Images.Media.DATA};
                    // Get the cursor
                    assert selectedImage != null;
                    Cursor cursor = getContentResolver().query(selectedImage, filePathColumn,
                            null, null, null);
                    // Move to first row
                    assert cursor != null;
                    cursor.moveToFirst();

                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    String imgDecodableString = cursor.getString(columnIndex);
                    cursor.close();
                    bitmap = BitmapFactory.decodeFile(imgDecodableString);
                    imgPreview.setImageBitmap(bitmap);
                    imgPath.setText(imgDecodableString);
                }
                break;
        }
    }
}

Reference

 

How to handle “android.os.FileUriExposedException”.

• How To Handle "android.os.FileUriExposedException" In Android
• To read the same in my blog click here.

Download

 

You can download the code from GitHub. If you like this article do like & share the article and star the repo in GitHub.