java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'int android.graphics.Bitmap.getWidth（）'

Question

如果从图库中选择图像或通过相机使我的应用程序崩溃捕获图像，id会做什么。

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        if (requestCode == 1) {
            File f = new File(Environment.getExternalStorageDirectory().toString());
            for (File temp : f.listFiles()) {
                if (temp.getName().equals("temp.jpg")) {
                    f = temp;
                    break;
                }
            }
            try {
                Bitmap bitmap;
                BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
                bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(), bitmapOptions);
                bitmap = getResizedBitmap(bitmap, 400);
                img_cam.setImageBitmap(bitmap);
                img_cam.setVisibility(View.VISIBLE);


                BitMapToString(bitmap);
                String path = android.os.Environment.getExternalStorageDirectory() + File.separator + "Phoenix" + File.separator + "default";
                f.delete();
                OutputStream outFile = null;
                File file = new File(path,String.valueOf(System.currentTimeMillis()) + ".jpg");
                try {
                    outFile = new FileOutputStream(file);
                    bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
                    outFile.flush();
                    outFile.close();
                } catch (FileNotFoundException e) { e.printStackTrace();
                } catch (IOException e) { e.printStackTrace();
                } catch (Exception e) { e.printStackTrace(); }
            } catch (Exception e) { e.printStackTrace(); }

        } else if (requestCode == 2) {
            Uri selectedImage = data.getData();
            String[] filePath = { MediaStore.Images.Media.DATA };
            Cursor c = getActivity().getContentResolver().query(selectedImage,filePath, null, null, null);
            c.moveToFirst();
            int columnIndex = c.getColumnIndex(filePath[0]);
            String picturePath = c.getString(columnIndex);
            c.close();
            Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));



            thumbnail = getResizedBitmap(thumbnail, 400);
            Log.w("path of image from gallery......******************.........", picturePath+"");

            img_cam.setImageBitmap(thumbnail);
            img_cam.setVisibility(View.VISIBLE);
            BitMapToString(thumbnail);
        }
    }
}

public String BitMapToString(Bitmap userImage1) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    userImage1.compress(Bitmap.CompressFormat.PNG, 60, baos);
    byte[] b = baos.toByteArray();
    Document_img1 = Base64.encodeToString(b, Base64.DEFAULT);

    return Document_img1;
}

public Bitmap getResizedBitmap(Bitmap image, int maxSize) {
    int width = image.getWidth();
    int height = image.getHeight();

    float bitmapRatio = (float)width / (float) height;
    if (bitmapRatio > 1) {
        width = maxSize;
        height = (int) (width / bitmapRatio);
    } else {
        height = maxSize;
        width = (int) (height * bitmapRatio);
    }
    return Bitmap.createScaledBitmap(image, width, height, true);
}

---

 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
        at package.name.Fragment.ChatFragment.getResizedBitmap(ChatFragment.java:414)
        at package.name.Fragment.ChatFragment.onActivityResult(ChatFragment.java:394)