AsyncTask 图像压缩 - 致命例外：AsyncTask #3（稍后上传到 Firebase 存储））

Question

我正在尝试使用此类在后台线程中压缩图像...

public class BackgroundImageResize extends AsyncTask<Uri, Integer, byte[]>{

    Bitmap mBitmap;

    public BackgroundImageResize(Bitmap bitmap) {
        if(bitmap != null){
            this.mBitmap = bitmap;
        }
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Toast.makeText(NextActivity.this, "compressing image", Toast.LENGTH_SHORT).show();

    }

    @Override
    protected byte[] doInBackground(Uri... params) {
        Log.d(TAG, "doInBackground: started.");

        if(mBitmap == null){
            try{
                mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);
            }catch (IOException e){
                Log.e(TAG, "doInBackground: IOException: " + e.getMessage());
            }
            catch (NullPointerException e)
            {

            }
        }
        byte[] bytes = null;
        bytes = getBytesFromBitmap(mBitmap, 100);
        return bytes;
    }

    @Override
    protected void onPostExecute(byte[] bytes) {
        super.onPostExecute(bytes);
        mUploadBytes = bytes;

        //execute the upload task


    }
}

public static byte[] getBytesFromBitmap(Bitmap bitmap, int quality){
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, quality,stream);
    return stream.toByteArray();
}

将位图传递给构造函数，如

BackgroundImageResize backgroundImageResize = new BackgroundImageResize(bitmap);

并像在onClickListener中调用execute()方法

 @Override
        public void onClick(View v) {
            Log.d(TAG, "onClick: navigating to the final share screen.");

            //Compress the image

             backgroundImageResize.execute();

我收到了这个 FATAL EXCEPTION 错误

4-27 00:10:01.318 17091-18093/manika.aditya.ekayana E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #3
                                                                   Process: manika.aditya.ekayana, PID: 17091
                                                                   java.lang.RuntimeException: An error occurred while executing doInBackground()
                                                                       at android.os.AsyncTask$3.done(AsyncTask.java:325)
                                                                       at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
                                                                       at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
                                                                       at java.util.concurrent.FutureTask.run(FutureTask.java:242)
                                                                       at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
                                                                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
                                                                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
                                                                       at java.lang.Thread.run(Thread.java:761)
                                                                    Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
                                                                       at manika.aditya.ekayana.Share.NextActivity$BackgroundImageResize.doInBackground(NextActivity.java:158)
                                                                       at manika.aditya.ekayana.Share.NextActivity$BackgroundImageResize.doInBackground(NextActivity.java:135)
                                                                       at android.os.AsyncTask$2.call(AsyncTask.java:305)

每当我运行应用程序并单击 textView 我不明白是什么原因造成的......

我必须稍后将压缩图像上传到 Firebase 存储

这是上传方式，以防万一

public void uploadNewPhoto(String photoType, final String caption,final int count, final String imgUrl,
                       Bitmap bm){
Log.d(TAG, "uploadNewPhoto: attempting to uplaod new photo.");

FilePaths filePaths = new FilePaths();
//case1) new photo
if(photoType.equals(mContext.getString(R.string.new_photo))){
    Log.d(TAG, "uploadNewPhoto: uploading NEW photo.");

    String user_id = FirebaseAuth.getInstance().getCurrentUser().getUid();
    StorageReference storageReference = mStorageReference
            .child(filePaths.FIREBASE_IMAGE_STORAGE + "/" + user_id + "/photo" + (count + 1));

    //convert image url to bitmap
    if(bm == null){
        bm = ImageManager.getBitmap(imgUrl);
    }

    byte[] bytes = ImageManager.getBytesFromBitmap(bm, 90);


    UploadTask uploadTask = null;
    uploadTask = storageReference.putBytes(bytes);

    uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
            Uri firebaseUrl = taskSnapshot.getDownloadUrl();

            Toast.makeText(mContext, "photo upload success", Toast.LENGTH_SHORT).show();

            //add the new photo to 'photos' node and 'user_photos' node
            addPhotoToDatabase(caption, firebaseUrl.toString());

            //navigate to the main feed so the user can see their photo
            Intent intent = new Intent(mContext, HomeActivity.class);
            mContext.startActivity(intent);
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            Log.d(TAG, "onFailure: Photo upload failed.");
            Toast.makeText(mContext, "Photo upload failed ", Toast.LENGTH_SHORT).show();
        }
    }).addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
            double progress = (100 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();

            if(progress - 15 > mPhotoUploadProgress){
                Toast.makeText(mContext, "photo upload progress: " + String.format("%.0f", progress) + "%", Toast.LENGTH_SHORT).show();
                mPhotoUploadProgress = progress;
            }

            Log.d(TAG, "onProgress: upload progress: " + progress + "% done");
        }
    });

我知道答案可能很明显，但我是初学者......提前谢谢你:)

顺便说一下，这就是我调用上传方法的方式

                //upload the image to firebase

            Toast.makeText(NextActivity.this, "Attempting to upload new photo", Toast.LENGTH_SHORT).show();
            String caption = mCaption.getText().toString();

            if(intent.hasExtra(getString(R.string.selected_image))){
                imgUrl = intent.getStringExtra(getString(R.string.selected_image));
                mFirebaseMethods.uploadNewPhoto(getString(R.string.new_photo), caption, imageCount, imgUrl,null);
            }
            else if(intent.hasExtra(getString(R.string.selected_bitmap))){
                bitmap = (Bitmap) intent.getParcelableExtra(getString(R.string.selected_bitmap));
                mFirebaseMethods.uploadNewPhoto(getString(R.string.new_photo), caption, imageCount, null,bitmap);
            }

在onClickViewListener中

:P

Answer 1

根据您的日志，问题是

java.lang.ArrayIndexOutOfBoundsException: length=0; index=0

我相信，这是由param[0] 引起的

mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);

params[] 必须是null，因为在onClick() 中调用backgroundImageResize.execute() 时不带参数，该参数将传递给doInBackground() 并存储在param[] 中。

作为解决方案，您只需将 Uri 传递给您的 onClick() 中的 backgroundImageResize.execute()，如下所示：

@Override
public void onClick(View v) {
    ...
    backgroundImageResize.execute(myUri);
    ...
}

另一种方法是通过像这样在doInBackground() 中捕获ArrayIndexOutOfBoundsException 来避免您的应用崩溃：

if(mBitmap == null){
    try{
        mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);
    }catch (IOException e){
        Log.e(TAG, "doInBackground: IOException: " + e.getMessage());
    }
    catch (NullPointerException e) {}
    catch (ArrayIndexOutOfBoundsExeption aioobe) {}
}