Camera

https://developer.android.com/training/camera/photobasics.html#TaskPath

Get the thumbnail(缩略图)

public static final int REQUEST_IMAGE_CAPTURE = 1;

private void btAlbum() {
       Intent takePictureIntent = new Intent(
               Intent.ACTION_PICK,
               MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
       startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}

@Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
   if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == Activity.RESULT_OK) {
            data?.extras?.let {
                val imageBitmap = it.get("data") as Bitmap
                img_show.setImageBitmap(imageBitmap)
       }
  }

Save the full-size photo

  provider_camera.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="my_images"
        path="Android/data/com.zhujia.land/files/Pictures" />
</paths>

跳转拍照 : 还得注意申请权限

private void dispatchTakePictureIntent(int num) {
       Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
       if (takePictureIntent.resolveActivity(this.getPackageManager()) != null) {
           try {
               photoFile = createImageFile();
           } catch (IOException e) {
               e.printStackTrace();
           }
           if (photoFile == null) {
               return;
           }
           Uri imgUri;
           if (Build.VERSION.SDK_INT < 24) {
               imgUri = Uri.fromFile(photoFile);
           } else {
               //Android 7.0系统开始 使用本地真实的Uri路径不安全,使用FileProvider封装共享Uri
               //参数二:fileprovider绝对路径 com.dyb.testcamerademo：项目包名
               imgUri = FileProvider.getUriForFile(this, "com.zhujia.land.fileprovider", photoFile);
           }
           takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);
       }
       startActivityForResult(takePictureIntent, num);
   }

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
      super.onActivityResult(requestCode, resultCode, data)
      if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == Activity.RESULT_OK) {
          //如果拍照成功，将Uri用BitmapFactory的decodeStream方法转为Bitmap
          val imageBitmap = BitmapFactory.decodeStream(photoURI?.let {
              contentResolver.openInputStream(
                  it
              )
          })
           galleryAddPic(mImageUriFromFile) //将拍的照片添加到相册
          img_show.setImageBitmap(imageBitmap)
      }
  }

照片添加到相册

/**
 * 将拍的照片添加到相册
 *
 * @param uri 拍的照片的Uri
 */
private fun galleryAddPic(uri: Uri?) {
    val mediaScanIntent = Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,uri)
    sendBroadcast(mediaScanIntent)
}

But it has a question

  fun createImageFile(context: Context): File? {
            // Create an image file name
            val timeStamp: String = SimpleDateFormat(yyyyMMDD_HHmmss).format(Date())
//            val storageDir: File? = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES)
            val storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)

            return File.createTempFile(
                "JPEG_${timeStamp}_", /* prefix */
                ".jpg", /* suffix */
                storageDir /* directory */
            ).apply {
                // Save a file: path for use with ACTION_VIEW intents
                var currentPhotoPath = absolutePath
                Timber.i("createImageFile  $currentPhotoPath")
            }
        }