android相机：无法将结果ResultInfo {who = null，request = 0，result = -1，data =null}传递给活动

Question

我真的很沮丧地解决了我的问题，我有一个使用相机的应用程序，当相机拍摄照片时，它将在活动中显示，当我不使用cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);照片时，将在活动中显示，但是名称和路径文件未显示就像我想要的。我正在使用galaxy选项卡进行编译，我已经按照教程从此处，此处和此处解决了我的问题，但是我的应用程序仍然强制关闭并出错，这是我的代码：

{

                File sdCard= Environment.getExternalStorageDirectory();
                File path = new File (sdCard.getAbsolutePath() + "/android/data/spaj_foto");
                path.mkdir();
                File file= new File (path,"spaj_foto.png");
                String filePath ="/android/data/spaj_foto/spaj_foto.png";

                  try {
                      file.createNewFile();
                    } catch (IOException e) {}


                 mPhotoUri = Uri.fromFile(file); 
                 values.put( MediaStore.Images.ImageColumns.DATA, file.getPath());
                 mPhotoUri=getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

                  Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
                  cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);
                  startActivityForResult(cameraIntent,TAKE_PHOTO_CODE );

            }

活动结果方法：

@Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
            if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) {
                Bitmap photo = (Bitmap) data.getExtras().get("data"); 
                image_spaj.setImageBitmap(photo);


                // CALL THIS METHOD TO GET THE URI FROM THE BITMAP
                Uri tempUri = getImageUri(getApplicationContext(), photo);

                // CALL THIS METHOD TO GET THE ACTUAL PATH
                File finalFile = new File(getRealPathFromURI(tempUri));

//              System.out.println(mImageCaptureUri);
            }  
        }
        public String getRealPathFromURI(Uri mPhotoUri) {
            Cursor cursor = getContentResolver().query(mPhotoUri, null, null, null, null); 
            cursor.moveToFirst(); 
            int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
            return cursor.getString(idx); 
        }

        public Uri getImageUri(Context inContext, Bitmap inImage) {
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
            String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
            return Uri.parse(path);
        }

这是我的logcat说的：

    09-27 10:59:43.186: E/AndroidRuntime(31318): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=null} to activity {org.example.touch/org.example.touch.FormSpaj}: java.lang.NullPointerException
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3179)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3222)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.access$1100(ActivityThread.java:140)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1276)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.os.Looper.loop(Looper.java:137)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.main(ActivityThread.java:4895)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at java.lang.reflect.Method.invokeNative(Native Method)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at java.lang.reflect.Method.invoke(Method.java:511)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at dalvik.system.NativeStart.main(Native Method)
09-27 10:59:43.186: E/AndroidRuntime(31318): Caused by: java.lang.NullPointerException
09-27 10:59:43.186: E/AndroidRuntime(31318):    at org.example.touch.FormSpaj.onActivityResult(FormSpaj.java:993)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.Activity.dispatchActivityResult(Activity.java:5347)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3175)
09-27 10:59:43.186: E/AndroidRuntime(31318):    ... 11 more

我真的希望有人可以帮助我解决我的问题，我已经堆满了，再也无法思考，请有人帮助我…谢谢。

Answer 1

确保您同时具有“ 摄像头权限” 和“ 读取/写入外部存储 权限”。

试试看，这对我来说就像魅力

private String selectedImagePath = "";
    final private int PICK_IMAGE = 1;
    final private int CAPTURE_IMAGE = 2;

public Uri setImageUri() {
        // Store image in dcim
        File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png");
        Uri imgUri = Uri.fromFile(file);
        this.imgPath = file.getAbsolutePath();
        return imgUri;
    }


    public String getImagePath() {
        return imgPath;
    }

btnGallery.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE);

            }
        });

        btnCapture.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
                startActivityForResult(intent, CAPTURE_IMAGE);
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_CANCELED) {
            if (requestCode == PICK_IMAGE) {
                selectedImagePath = getAbsolutePath(data.getData());
                imgUser.setImageBitmap(decodeFile(selectedImagePath));
            } else if (requestCode == CAPTURE_IMAGE) {
                selectedImagePath = getImagePath();
                imgUser.setImageBitmap(decodeFile(selectedImagePath));
            } else {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }

    }


public Bitmap decodeFile(String path) {
        try {
            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(path, o);
            // The new size we want to scale to
            final int REQUIRED_SIZE = 70;

            // Find the correct scale value. It should be the power of 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
                scale *= 2;

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            return BitmapFactory.decodeFile(path, o2);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;

    }

public String getAbsolutePath(Uri uri) {
        String[] projection = { MediaColumns.DATA };
        @SuppressWarnings("deprecation")
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if (cursor != null) {
            int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        } else
            return null;
    }