java - 机器人 : how to add image from gallery and delete image with a Button

Question

我想加载从画廊和相机拍摄的图像，当用户点击捕捉按钮时，图像将从照相手机设备捕捉，当用户点击 add_gallery 按钮时，图像将从画廊拍摄，我的问题是当我从图库中选择一张图片，它不会显示在我的 Activity 中(在由 foto_dp 命名的我的 ImageView 上)。 这是我的代码:

    @Override
public void onClick(View arg0) {
    switch (arg0.getId()){

    break;
    case R.id.capture_dp:
        final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
        startActivityForResult(intent, TAKE_PHOTO_CODE);
    break;
    case R.id.add_galery_dp:
        Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        i.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());  
                startActivityForResult(i, PICK_FROM_GALLERY);
    break;
    case R.id.delete_image_dp:

    break;
}

public Uri setImageUri() {
    // Store image in dcim
    File file = new File(Environment.getExternalStorageDirectory() +"/android/data/spaj_foto/spaj_foto("+counter+").png");
    Uri imgUri = Uri.fromFile(file);
    this.imgPath = file.getAbsolutePath();
    return imgUri;
}
 public String getImagePath() {
        return imgPath;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {  
         if (resultCode != Activity.RESULT_CANCELED) {
                    if (requestCode == TAKE_PHOTO_CODE) {
                    selectedImagePath = getImagePath();
                    foto_dp.setImageBitmap(decodeFile(selectedImagePath));

                    if (requestCode == PICK_FROM_GALLERY) {
                        selectedImagePath = getImagePath();
                        foto_dp.setImageBitmap(decodeFile(selectedImagePath));
                    }
                } else {
                    super.onActivityResult(requestCode, resultCode, data);
                }
         }
    }
     public Bitmap decodeFile(String path) {
            try {
                // Decode image size
                BitmapFactory.Options o = new BitmapFactory.Options();
                o.inJustDecodeBounds = true;
                BitmapFactory.decodeFile(path, o);
                // The new size we want to scale to
                final int REQUIRED_SIZE = 70;

                // Find the correct scale value. It should be the power of 2.
                int scale = 1;
                while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
                    scale *= 2;

                // Decode with inSampleSize
                BitmapFactory.Options o2 = new BitmapFactory.Options();
                o2.inSampleSize = scale;
                return BitmapFactory.decodeFile(path, o2);
            } catch (Throwable e) {
                e.printStackTrace();
            }
            return null;

        }   

我的代码有问题吗？以及如何使用我的 Activity 按钮删除图像？我希望有人能帮助我解决我的问题，谢谢

Answer 1

您不需要解码文件。试试下面的代码

private final int REQUEST_CODE_CAMERA_IMAGE = 1000;
private final int REQUEST_CODE_EXTERNAL_IMAGE = 2000;

//select picture from external storage
    btnChoosePicture.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            // choose picture from gallery
            Intent intent = new Intent(
                    Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

            startActivityForResult(intent,
                    REQUEST_CODE_EXTERNAL_IMAGE);

        }
    });

    //take picture from camera
    btnTakePhoto.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            // start camera to take picture
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
            intent.putExtra(MediaStore.EXTRA_OUTPUT,
                    setImageUri());
            startActivityForResult(intent,
                    REQUEST_CODE_CAMERA_IMAGE);

        }
    });

像这样显示图像

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {

    // get image from camera
    case REQUEST_CODE_CAMERA_IMAGE:
        if (resultCode == Activity.RESULT_OK) {
            imageView.setImageUri(setImageUri());

        }
        break;
    // get image from external storage
    case REQUEST_CODE_EXTERNAL_IMAGE:
        if (resultCode == Activity.RESULT_OK) {
            imageView.setImageUri(data.getData());

        }
        break;
    default:
        break;
    }

}

删除图片

btnDelete.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
          File file = new File(imagePath);
          if(file.exist())
              file.delete();    
    }
 });