如何在裁剪后将图像转换为位图?

时间:2018-04-21 12:17:03

标签: java android nullpointerexception android-crop

在我的应用程序中,我希望裁剪图像,然后将其转换为bitmap
对于裁剪图片,我使用https://github.com/jdamcd/android-crop

我想在致电onActivityResult时将此图片转换为bitmap,为此我写下以下代码:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent result) {
    if (requestCode == Crop.REQUEST_PICK && resultCode == RESULT_OK) {
        beginCrop(result.getData());
    } else if (requestCode == Crop.REQUEST_CROP) {
        handleCrop(resultCode, result);
    }
}

private void beginCrop(Uri source) {
    Uri destination = Uri.fromFile(new File(getCacheDir(), "cropped"));
    Crop.of(source, destination).asSquare().start(this);
}

private void handleCrop(int resultCode, Intent result) {
    if (resultCode == RESULT_OK) {

        if (result != null) {
            Bundle bundle = result.getExtras();
            Bitmap bitmap = bundle.getParcelable("data");
            //imageView.setImageBitmap(bitmap);
            base64String = ImageConvertBase64.convert(bitmap);

            //Edit base64 for site
            base64StringForSite = "data:image/png;base64," + base64String;

            //Upload image call api
            UploadAvatarImageSendData sendData = new UploadAvatarImageSendData();
            sendData.setBase64ImageData(base64StringForSite);

            profileEdit_avatarProgressBar.setVisibility(View.VISIBLE);

            Call<SendCommentResponse> call = api.getUserUploadAvatar(token, "2", sendData);

            call.enqueue(new Callback<SendCommentResponse>() {
                @Override
                public void onResponse(Call<SendCommentResponse> call, Response<SendCommentResponse> response) {
                    if (response.body().getData() != null) {
                        profileEdit_avatarProgressBar.setVisibility(View.GONE);
                        getUpdateAvatarImage();
                        Toasty.success(context, response.body().getStatusMessage(), Toast.LENGTH_SHORT, true).show();
                    } else {
                        Toasty.info(context, context.getResources().getString(R.string.retryAgainAgain), Toast.LENGTH_SHORT, true).show();
                    }
                }

                @Override
                public void onFailure(Call<SendCommentResponse> call, Throwable t) {
                    profileEdit_avatarProgressBar.setVisibility(View.GONE);
                    Log.e("uploadImage", "Err : " + t.getMessage());
                }
            });
        }

    } else if (resultCode == Crop.RESULT_ERROR) {
        Toast.makeText(this, Crop.getError(result).getMessage(), Toast.LENGTH_SHORT).show();
    }
}

这是我将位图转换为base64的方法:

public static String convert(Bitmap bitmap) {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);

    return Base64.encodeToString(outputStream.toByteArray(), Base64.DEFAULT);
}

但是当运行应用程序时,会在LogCat中的错误消息下面显示:

  

引起:java.lang.NullPointerException:尝试调用虚拟   方法&#39;布尔值   android.graphics.Bitmap.compress(android.graphics.Bitmap $ CompressFormat,   int,java.io.OutputStream)&#39;在null对象引用上       at com.example.app.Utils.Componenets.ImageConvertBase64.convert(ImageConvertBase64.java:25)       at com.example.app.Activities.ProfileEditActivity.handleCrop(ProfileEditActivity.java:326)       at com.example.appt.Activities.ProfileEditActivity.onActivityResult(ProfileEditActivity.java:192)       在android.app.Activity.dispatchActivityResult(Activity.java:6222)       在android.app.ActivityThread.deliverResults(ActivityThread.java:3627)

我该如何解决?请帮我。

我很业余,真的需要你的帮助。谢谢

0 个答案:

没有答案