如何将相机拍摄的图像保存在手机内存中以检查文件大小？

Question

I am testing a camera application which captures high quality images. I want the captured image to be saved in the mobile memory (Internal or external) to check the details of the image.

I've the below code for capturing the image.

import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomSheetBehavior;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import android.widget.Toast;

import com.otaliastudios.cameraview.CameraListener;
import com.otaliastudios.cameraview.CameraLogger;
import com.otaliastudios.cameraview.CameraOptions;
import com.otaliastudios.cameraview.CameraView;
import com.otaliastudios.cameraview.SessionType;
import com.otaliastudios.cameraview.Size;

import java.io.File;


public class CameraActivity extends AppCompatActivity implements View.OnClickListener, ControlView.Callback {

    private CameraView camera;
    private ViewGroup controlPanel;

    private boolean mCapturingPicture;
    private boolean mCapturingVideo;

    // To show stuff in the callback
    private Size mCaptureNativeSize;
    private long mCaptureTime;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
                WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
        setContentView(R.layout.activity_camera);
        CameraLogger.setLogLevel(CameraLogger.LEVEL_VERBOSE);

        camera = findViewById(R.id.camera);
        camera.addCameraListener(new CameraListener() {
            public void onCameraOpened(CameraOptions options) { onOpened(); }
            public void onPictureTaken(byte[] jpeg) { onPicture(jpeg); }

            @Override
            public void onVideoTaken(File video) {
                super.onVideoTaken(video);
                onVideo(video);
            }
        });

        findViewById(R.id.edit).setOnClickListener(this);
        findViewById(R.id.capturePhoto).setOnClickListener(this);
        findViewById(R.id.captureVideo).setOnClickListener(this);
        findViewById(R.id.toggleCamera).setOnClickListener(this);

        controlPanel = findViewById(R.id.controls);
        ViewGroup group = (ViewGroup) controlPanel.getChildAt(0);
        Control[] controls = Control.values();
        for (Control control : controls) {
            ControlView view = new ControlView(this, control, this);
            group.addView(view, ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
        }

        controlPanel.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                BottomSheetBehavior b = BottomSheetBehavior.from(controlPanel);
                b.setState(BottomSheetBehavior.STATE_HIDDEN);
            }
        });
    }

    private void message(String content, boolean important) {
        int length = important ? Toast.LENGTH_LONG : Toast.LENGTH_SHORT;
        Toast.makeText(this, content, length).show();
    }

    private void onOpened() {
        ViewGroup group = (ViewGroup) controlPanel.getChildAt(0);
        for (int i = 0; i < group.getChildCount(); i++) {
            ControlView view = (ControlView) group.getChildAt(i);
            view.onCameraOpened(camera);
        }
    }

    private void onPicture(byte[] jpeg) {
        mCapturingPicture = false;
        long callbackTime = System.currentTimeMillis();
        if (mCapturingVideo) {
            message("Captured while taking video. Size="+mCaptureNativeSize, false);
            return;
        }

        // This can happen if picture was taken with a gesture.
        if (mCaptureTime == 0) mCaptureTime = callbackTime - 300;
        if (mCaptureNativeSize == null) mCaptureNativeSize = camera.getPictureSize();

        PicturePreviewActivity.setImage(jpeg);
        Intent intent = new Intent(CameraActivity.this, PicturePreviewActivity.class);
        intent.putExtra("delay", callbackTime - mCaptureTime);
        intent.putExtra("nativeWidth", mCaptureNativeSize.getWidth());
        intent.putExtra("nativeHeight", mCaptureNativeSize.getHeight());
        startActivity(intent);

        mCaptureTime = 0;
        mCaptureNativeSize = null;
    }

    private void onVideo(File video) {
        mCapturingVideo = false;
        Intent intent = new Intent(CameraActivity.this, VideoPreviewActivity.class);
        intent.putExtra("video", Uri.fromFile(video));
        startActivity(intent);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.edit: edit(); break;
            case R.id.capturePhoto: capturePhoto(); break;
            case R.id.captureVideo: captureVideo(); break;
            case R.id.toggleCamera: toggleCamera(); break;
        }
    }

    @Override
    public void onBackPressed() {
        BottomSheetBehavior b = BottomSheetBehavior.from(controlPanel);
        if (b.getState() != BottomSheetBehavior.STATE_HIDDEN) {
            b.setState(BottomSheetBehavior.STATE_HIDDEN);
            return;
        }
        super.onBackPressed();
    }

    private void edit() {
        BottomSheetBehavior b = BottomSheetBehavior.from(controlPanel);
        b.setState(BottomSheetBehavior.STATE_COLLAPSED);
    }

    private void capturePhoto() {
        if (mCapturingPicture) return;
        mCapturingPicture = true;
        mCaptureTime = System.currentTimeMillis();
        mCaptureNativeSize = camera.getPictureSize();
        message("Capturing picture...", false);
        camera.capturePicture();
    }

    private void captureVideo() {
        if (camera.getSessionType() != SessionType.VIDEO) {
            message("Can't record video while session type is 'picture'.", false);
            return;
        }
        if (mCapturingPicture || mCapturingVideo) return;
        mCapturingVideo = true;
        message("Recording for 8 seconds...", true);
        camera.startCapturingVideo(null, 8000);
    }

    private void toggleCamera() {
        if (mCapturingPicture) return;
        switch (camera.toggleFacing()) {
            case BACK:
                message("Switched to back camera!", false);
                break;

            case FRONT:
                message("Switched to front camera!", false);
                break;
        }
    }

    @Override
    public boolean onValueChanged(Control control, Object value, String name) {
        if (!camera.isHardwareAccelerated() && (control == Control.WIDTH || control == Control.HEIGHT)) {
            if ((Integer) value > 0) {
                message("This device does not support hardware acceleration. " +
                        "In this case you can not change width or height. " +
                        "The view will act as WRAP_CONTENT by default.", true);
                return false;
            }
        }
        control.applyValue(camera, value);
        BottomSheetBehavior b = BottomSheetBehavior.from(controlPanel);
        b.setState(BottomSheetBehavior.STATE_HIDDEN);
        message("Changed " + control.getName() + " to " + name, false);
        return true;
    }

    //region Boilerplate

    @Override
    protected void onResume() {
        super.onResume();
        camera.start();
    }

    @Override
    protected void onPause() {
        super.onPause();
        camera.stop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        camera.destroy();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        boolean valid = true;
        for (int grantResult : grantResults) {
            valid = valid && grantResult == PackageManager.PERMISSION_GRANTED;
        }
        if (valid && !camera.isStarted()) {
            camera.start();
        }
    }

    //endregion
}

I've also added the permissions to read and write the external storage. But I just want to know the size of the picture once it is saved.

Adding the code to save the image -

    public void KickOut(String filename,Bitmap bitmap){

        ActivityCompat.requestPermissions(PicturePreviewActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
        OutputStream outputStream;
        File filepath=Environment.getExternalStorageDirectory();
//        File dir=new File(filepath+"/Olaa/");
        File dir=new File("/Environment.getExternalStoragePublicDirectory/Imgs/");
        dir.mkdirs();
        File file=new File(dir,"filename.png");
        Toast.makeText(PicturePreviewActivity.this, file + " -> saved" , Toast.LENGTH_SHORT).show();
        try{
            outputStream=new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG,100,outputStream);
            outputStream.flush();outputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
//        Toast.makeText(PicturePreviewActivity.this, filepath + " -> path" , Toast.LENGTH_SHORT).show();
    }

Answer 1

You can check the size of the captured image you can also save the file in your custom folder.

you can get the result in onActivityResult() and get the image from the bundle and convert it into the byte and lengthbmp_KB will give you size in kb.

if (resultCode == RESULT_OK) {

        //Image capture
        if (requestCode == 1) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
            byte[] imageInByte = bytes.toByteArray();
            long lengthbmp = imageInByte.length;
            // save on custom folder
            File destination1 = createDirectoryAndSaveFile(thumbnail, System.currentTimeMillis() + ".jpg");

          /*  File destination = new File(Environment.getExternalStorageDirectory(),
                    System.currentTimeMillis() + ".jpg");*/
            picturePath = "" + destination1;
            // show image on gallery
            scanGallery(getActivity(), picturePath);

            long lengthbmp_KB = lengthbmp / 1024;
            long length_MB = lengthbmp_KB / 1024;

        }

you can save the file at your own folder

 private File createDirectoryAndSaveFile(Bitmap imageToSave, String fileName) {
    File direct = new File(Environment.getExternalStorageDirectory() + "/My Images");
    if (!direct.exists()) {
        File wallpaperDirectory = new File("/sdcard/MYfolder Images/");
        wallpaperDirectory.mkdirs();
    }
    File file = new File(new File("/sdcard/Myfolder Images/"), fileName);
  /*  if (file.exists()) {
        file.delete();
    }*/
    try {
        FileOutputStream out = new FileOutputStream(file);
        imageToSave.compress(Bitmap.CompressFormat.JPEG, 100, out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return file;
}

You can see your images in Gallery by using this MediaScannerConnection

 private void scanGallery(Context cntx, String path) {
    try {
        MediaScannerConnection.scanFile(cntx, new String[]{path}, null, new MediaScannerConnection.OnScanCompletedListener() {
            public void onScanCompleted(String path, Uri uri) {
            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
}

and use this method in onActivityResult()

Answer 2

To check the size of image saved in phone memory , you could use Bitmapfactory.option

**BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filename, options);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;**

Answer 3

You can use this to save the file provided you've given the permissions in the manifest.

static final int REQUEST_TAKE_PHOTO = 1;

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
            ...
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                                                  "com.example.android.fileprovider",
                                                  photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }
}

Take a look at the docs too over here.