Question

我正在Android中创建一个应用程序，我想让用户从照片库中选择他的个人资料照片。我想让用户在从图库中选择图像或从相机捕获图像时为其个人资料图片裁剪图像。我正在使用图像选择器库来捕获或从库中选择图像。任何人都可以建议实施这个的最佳方法是什么？

Answer 1

首先您可以使用此代码从厨房和相机拍摄图像：它肯定有效：

        private void selectImage() {
    final CharSequence[] items = { "Take Photo", "Choose from Library", "Cancel" };
    AlertDialog.Builder builder = new AlertDialog.Builder(Enrolement.this);
    builder.setTitle("Add Photo!");
    builder.setItems(items, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int item) {
            if (items[item].equals("Take Photo")) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent, REQUEST_CAMERA);
            } else if (items[item].equals("Choose from Library")) {
                Intent intent = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                intent.setType("image/*");
                startActivityForResult(
                        Intent.createChooser(intent, "Select File"),
                        SELECT_FILE);
            } else if (items[item].equals("Cancel")) {
                dialog.dismiss();
            }
        }
    });
    builder.show();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == Activity.RESULT_OK) {
        if (requestCode == SELECT_FILE)
            onSelectFromGalleryResult(data);
        else if (requestCode == REQUEST_CAMERA)
            onCaptureImageResult(data);
    }
}

private void onCaptureImageResult(Intent data) {
    Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);

    File destination = new File(Environment.getExternalStorageDirectory(),
            System.currentTimeMillis() + ".jpg");

    FileOutputStream fo;
    try {
        destination.createNewFile();
        fo = new FileOutputStream(destination);
        fo.write(bytes.toByteArray());
        fo.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    ivImage.setImageBitmap(thumbnail);
}

@SuppressWarnings("deprecation")
private void onSelectFromGalleryResult(Intent data) {
    Uri selectedImageUri = data.getData();
    String[] projection = { MediaStore.MediaColumns.DATA };
    Cursor cursor = managedQuery(selectedImageUri, projection, null, null,
            null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
    cursor.moveToFirst();

    String selectedImagePath = cursor.getString(column_index);

    Bitmap bm;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(selectedImagePath, options);
    final int REQUIRED_SIZE = 200;
    int scale = 1;
    while (options.outWidth / scale / 2 >= REQUIRED_SIZE
            && options.outHeight / scale / 2 >= REQUIRED_SIZE)
        scale *= 2;
    options.inSampleSize = scale;
    options.inJustDecodeBounds = false;
    bm = BitmapFactory.decodeFile(selectedImagePath, options);

    ivImage.setImageBitmap(bm);
}

主要部分是裁剪：你可以使用 com.android.camera.action.CROP

的动作在Intent上调用startActivity（）

       Intent intent = new Intent("com.android.camera.action.CROP");  
  intent.setClassName("com.android.camera", "com.android.camera.CropImage");  
 File file = new File(filePath);  
 Uri uri = Uri.fromFile(file);  
intent.setData(uri);  
intent.putExtra("crop", "true");  
 intent.putExtra("aspectX", 1);  
intent.putExtra("aspectY", 1);  
intent.putExtra("outputX", 96);  
 intent.putExtra("outputY", 96);  
  intent.putExtra("noFaceDetection", true);  
 intent.putExtra("return-data", true);                                  
 startActivityForResult(intent, REQUEST_CROP_ICON);

当图片选择活动返回时，将选择保存内容。在onActivityResult：

          Bundle extras = data.getExtras();  
        if(extras != null ) {  
          Bitmap photo = extras.getParcelable("data");  
           ByteArrayOutputStream stream = new ByteArrayOutputStream();  
            photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);  
          / / The stream to write to a file or directly using the
             }

它可能有用，但这不是一个好用的做法 com.android.camera.action.CROP 因为android没有裁剪意图。

用户从图库中选择图像来裁剪图像

1 个答案: