Question

我正在尝试从我的图库中获取图像并将其设置为裁剪器视图。我使用this库作为我的裁剪器视图。

问题：如何解决此代码mBitmap.getWidth()上的空对象引用错误（请参阅代码）。

我尝试了String fname=new File(absPath, "test.png").getAbsolutePath();，但没有效果。我不认为我知道如何实现它。非常感谢我能得到的每一个帮助。提前谢谢！

代码：

public void addImage(View view) {
        SharedPreferences galleryAccess_2 = getSharedPreferences("GALLERY_ACCESS", Context.MODE_PRIVATE);
        boolean galleryAccessNum = galleryAccess_2.getBoolean("galleryAccess", false);

        if (galleryAccessNum) {
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, 2);
        } else {
            accessGallery();
        }
    }
@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case 2:
                if (resultCode == RESULT_OK) {

                    selectedImage = data.getData();
                    String absPath = selectedImage.toString();

                    //String fname=new File(absPath, "test.png").getAbsolutePath();
                    //String absPath = BitmapUtils.getFilePathFromUri(this, data.getData());
                    loadNewImage(absPath);

                }
        }

private void loadNewImage(String filePath) {
        //Log.i(TAG, "load image: " + filePath);
        mBitmap = BitmapFactory.decodeFile(filePath);
        //Log.i(TAG, "bitmap: " + mBitmap.getWidth() + " " + mBitmap.getHeight());

        int maxP = Math.max(mBitmap.getWidth(), mBitmap.getHeight()); //***ERROR*** on this line****
        float scale1280 = (float)maxP / 1280;

        if (mCropperView.getWidth() != 0) {
            mCropperView.setMaxZoom(mCropperView.getWidth() * 2 / 1280f);
        } else {

            ViewTreeObserver vto = mCropperView.getViewTreeObserver();
            vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
                @Override
                public boolean onPreDraw() {
                    mCropperView.getViewTreeObserver().removeOnPreDrawListener(this);
                    mCropperView.setMaxZoom(mCropperView.getWidth() * 2 / 1280f);
                    return true;
                }
            });

        }

        mBitmap = Bitmap.createScaledBitmap(mBitmap, (int)(mBitmap.getWidth()/scale1280),
                (int)(mBitmap.getHeight()/scale1280), true);

        mCropperView.setImageBitmap(mBitmap);

    }

编辑：此字符串是我的absPath返回的内容：content://com.google.android.apps.photos.contentprovider/0/1/content%3A%2F%2Fmedia%2Fexternal%2Fimages%2Fmedia%2F25732/ORIGINAL/NONE/272125879

解答：

我找到了答案。请参阅下面的代码更改。坦率地说，如果ΦXocę 웃 Пepeúpa ツ非常不负责任，我认为重复的标记。我的问题没有询问我是什么或为什么我得到NPE。我只是表明我在某个时候得到了一个NPE。这并不意味着我要求什么是NPE或为什么。

解决方案要求我使用decodeStream（）而不是decodeFile（）。标记重复的要点是确保对同一个问题的答案去往同一个地方，但这个答案肯定不属于那里。顺便说一下，那个建议的答案根本没有帮助。感谢@DEADMC至少试图提供帮助。

代码：

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case 2:
                if (resultCode == RESULT_OK) {

                    try {
                        selectedImage = data.getData();
                        is = getContentResolver().openInputStream(selectedImage);
                        loadNewImage(is);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
        }

private void loadNewImage(InputStream filePath) {
        try {
            mBitmap = BitmapFactory.decodeStream(filePath);
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //Log.i(TAG, "load image: " + filePath);

        //Log.i(TAG, "bitmap: " + mBitmap.getWidth() + " " + mBitmap.getHeight());


        int maxP = Math.max(mBitmap.getWidth(), mBitmap.getHeight());
        float scale1280 = (float)maxP / 1280;

        if (mCropperView.getWidth() != 0) {
            mCropperView.setMaxZoom(mCropperView.getWidth() * 2 / 1280f);
        } else {

            ViewTreeObserver vto = mCropperView.getViewTreeObserver();
            vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
                @Override
                public boolean onPreDraw() {
                    mCropperView.getViewTreeObserver().removeOnPreDrawListener(this);
                    mCropperView.setMaxZoom(mCropperView.getWidth() * 2 / 1280f);
                    return true;
                }
            });

        }

        mBitmap = Bitmap.createScaledBitmap(mBitmap, (int)(mBitmap.getWidth()/scale1280),
                (int)(mBitmap.getHeight()/scale1280), true);

        mCropperView.setImageBitmap(mBitmap);
    }

尝试调用虚拟方法＆＃39; Bitmap.getWidth（）＆＃39;在null对象引用上

0 个答案: