android 拍照上传 源代码

Android拍照上传主要分为两个部分，即照相和上传。在照相方面需要使用Android提供的API，如Camera类来实现；而在上传方面则可以使用HTTP POST请求或其他方式实现，如FTP的方式上传。以下是一个简单的拍照上传的源代码：

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_IMAGE_CAPTURE = 1;
    private ImageView mImageView;
    private Bitmap mBitmap;
    private String mFilePath;

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

        mImageView = findViewById(R.id.imageView);

        Button captureButton = findViewById(R.id.captureButton);
        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dispatchTakePictureIntent();
            }
        });

        Button uploadButton = findViewById(R.id.uploadButton);
        uploadButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                UploadTask uploadTask = new UploadTask();
                uploadTask.execute(mFilePath);
            }
        });
    }

    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(this,
                        "com.example.android.fileprovider",
                        photoFile);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
        }
    }

    private File createImageFile() throws IOException {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );
        mFilePath = image.getAbsolutePath();
        return image;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            mBitmap = BitmapFactory.decodeFile(mFilePath);
            mImageView.setImageBitmap(mBitmap);
        }
    }

    private class UploadTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            String filePath = params[0];
            HttpsURLConnection conn = null;
            DataOutputStream dos = null;
            String lineEnd = "\r\n";
            String twoHyphens = "--";
            String boundary = "*****";

            int bytesRead, bytesAvailable, bufferSize;
            byte[] buffer;
            int maxBufferSize = 1024 * 1024;

            File sourceFile = new File(filePath);
            if(!sourceFile.isFile()){
                return null;
            }

            try{
                FileInputStream fileInputStream = new FileInputStream(sourceFile);
                URL url = new URL("http://example.com/upload.php");
                conn = (HttpsURLConnection) url.openConnection();
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.setUseCaches(false);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Connection", "Keep-Alive");
                conn.setRequestProperty("ENCTYPE", "multipart/form-data");
                conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

                dos = new DataOutputStream(conn.getOutputStream());

                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + filePath + "\"" + lineEnd);
                dos.writeBytes(lineEnd);

                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                buffer = new byte[bufferSize];

                bytesRead = fileInputStream.read(buffer, 0, bufferSize);

                while (bytesRead > 0){
                    dos.write(buffer, 0, bufferSize);
                    bytesAvailable = fileInputStream.available();
                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                }
                dos.writeBytes(lineEnd);
                dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

                int responseCode = conn.getResponseCode();

                if (responseCode == 200) {
                    return "success";
                }

                fileInputStream.close();
                dos.flush();
                dos.close();

            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            if(result != null && result.equals("success")){
                Toast.makeText(MainActivity.this, "Upload Success", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(MainActivity.this, "Upload Failed", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

上述代码中，setOnClickListener()方法可以监听拍照和上传按钮的点击事件，dispatchTakePictureIntent()方法用于调用系统相机拍照，createImageFile()方法用于创建保存拍照图片的文件，而HTTP POST上传的实现则在UploadTask类中的doInBackground()方法中。当上传成功或失败时会通过Toast提示用户。