Android 安卓：拍摄照片，存储在SD卡上，然后覆盖它以创建更小的照片

以下是我重现此场景的代码：

• 用户点击“拍照”按钮并拍照
• 用户单击“创建一次”按钮，将捕获的照片上载到服务器

所有这些部分都工作正常，但我想解决的问题是上传图像的大小太大：大约2Mo。

我想创建一个捕获图像的阴影副本，以便在第一张照片的基础上创建一张更小的照片。（如果可能，我们可以覆盖第一个）

我不知道该怎么做，在我的代码中该在哪里做

初始化目标文件的代码：

String uniqueID = UUID.randomUUID().toString();
        String name = dateToString(new Date(),"yyyy-MM-dd-hh-mm-ss");
        imageToStore = name + uniqueID + ".jpg";
        destination = new File(Environment.getExternalStorageDirectory(), imageToStore);

takePhoto.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destination));
                startActivityForResult(intent, REQUEST_IMAGE);

                overridePendingTransition(R.anim.left_to_right, R.anim.right_to_left);
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if( requestCode == REQUEST_IMAGE && resultCode == Activity.RESULT_OK ){
            try {
                preview.setVisibility(View.VISIBLE);
                takePhoto.setVisibility(View.GONE);
                txtHaut.setText("Cette image est parfaite !");
                FileInputStream in = new FileInputStream(destination);
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize = 8;
                imagePath = destination.getAbsolutePath();
                Log.d("INFO", "PATH === " +imagePath);
                Bitmap bmp = BitmapFactory.decodeStream(in, null, options);
                preview.setImageBitmap(bmp);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
        else{
            tvPath.setText("Request cancelled");
        }
    }

btnCreate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog = ProgressDialog.show(New_annonce_act_step3.this, "", "Création de votre annonce en cours ..", true);

                new Thread(new Runnable() {
                    public void run() {       
                        uploadFile(imagePath);
                    }
                }).start();

            }

        });

当用户单击按钮时，它将启动照片捕获：

String uniqueID = UUID.randomUUID().toString();
        String name = dateToString(new Date(),"yyyy-MM-dd-hh-mm-ss");
        imageToStore = name + uniqueID + ".jpg";
        destination = new File(Environment.getExternalStorageDirectory(), imageToStore);

takePhoto.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destination));
                startActivityForResult(intent, REQUEST_IMAGE);

                overridePendingTransition(R.anim.left_to_right, R.anim.right_to_left);
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if( requestCode == REQUEST_IMAGE && resultCode == Activity.RESULT_OK ){
            try {
                preview.setVisibility(View.VISIBLE);
                takePhoto.setVisibility(View.GONE);
                txtHaut.setText("Cette image est parfaite !");
                FileInputStream in = new FileInputStream(destination);
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize = 8;
                imagePath = destination.getAbsolutePath();
                Log.d("INFO", "PATH === " +imagePath);
                Bitmap bmp = BitmapFactory.decodeStream(in, null, options);
                preview.setImageBitmap(bmp);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
        else{
            tvPath.setText("Request cancelled");
        }
    }

btnCreate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog = ProgressDialog.show(New_annonce_act_step3.this, "", "Création de votre annonce en cours ..", true);

                new Thread(new Runnable() {
                    public void run() {       
                        uploadFile(imagePath);
                    }
                }).start();

            }

        });

处理捕获的代码：

String uniqueID = UUID.randomUUID().toString();
        String name = dateToString(new Date(),"yyyy-MM-dd-hh-mm-ss");
        imageToStore = name + uniqueID + ".jpg";
        destination = new File(Environment.getExternalStorageDirectory(), imageToStore);

takePhoto.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destination));
                startActivityForResult(intent, REQUEST_IMAGE);

                overridePendingTransition(R.anim.left_to_right, R.anim.right_to_left);
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if( requestCode == REQUEST_IMAGE && resultCode == Activity.RESULT_OK ){
            try {
                preview.setVisibility(View.VISIBLE);
                takePhoto.setVisibility(View.GONE);
                txtHaut.setText("Cette image est parfaite !");
                FileInputStream in = new FileInputStream(destination);
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize = 8;
                imagePath = destination.getAbsolutePath();
                Log.d("INFO", "PATH === " +imagePath);
                Bitmap bmp = BitmapFactory.decodeStream(in, null, options);
                preview.setImageBitmap(bmp);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
        else{
            tvPath.setText("Request cancelled");
        }
    }

btnCreate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog = ProgressDialog.show(New_annonce_act_step3.this, "", "Création de votre annonce en cours ..", true);

                new Thread(new Runnable() {
                    public void run() {       
                        uploadFile(imagePath);
                    }
                }).start();

            }

        });

最后，当用户单击“创建一次”按钮时，它上传照片：

String uniqueID = UUID.randomUUID().toString();
        String name = dateToString(new Date(),"yyyy-MM-dd-hh-mm-ss");
        imageToStore = name + uniqueID + ".jpg";
        destination = new File(Environment.getExternalStorageDirectory(), imageToStore);

takePhoto.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destination));
                startActivityForResult(intent, REQUEST_IMAGE);

                overridePendingTransition(R.anim.left_to_right, R.anim.right_to_left);
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if( requestCode == REQUEST_IMAGE && resultCode == Activity.RESULT_OK ){
            try {
                preview.setVisibility(View.VISIBLE);
                takePhoto.setVisibility(View.GONE);
                txtHaut.setText("Cette image est parfaite !");
                FileInputStream in = new FileInputStream(destination);
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize = 8;
                imagePath = destination.getAbsolutePath();
                Log.d("INFO", "PATH === " +imagePath);
                Bitmap bmp = BitmapFactory.decodeStream(in, null, options);
                preview.setImageBitmap(bmp);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
        else{
            tvPath.setText("Request cancelled");
        }
    }

btnCreate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog = ProgressDialog.show(New_annonce_act_step3.this, "", "Création de votre annonce en cours ..", true);

                new Thread(new Runnable() {
                    public void run() {       
                        uploadFile(imagePath);
                    }
                }).start();

            }

        });

---

为什么不上传为预览图像视图创建的新位图？检查@PreetiPatwa如果我完全理解您引用的帖子中的代码，decodeFile会返回要上传的新图像的地址吗？事实上，第一个已经被覆盖了？不，没有被覆盖。它正在创建一个新位图，将其保存到临时文件并上载该临时文件。我不知道如何作为DESIREWIDTH和DESIREHEIGHT的参数传递：

imagePath=decodeFile（imagePath，bmp.getWidth（），bmp.getHeight（））？。所需宽度*所需高度*4==2mb。计算当前的宽高比，并相应地设置desiredWidth和desiredHeight。