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我正在尝试通过捕获照片将客户缩略图添加到他的帐户并通过另一个活动裁剪脸部。它在模拟器中运行良好，但在实际设备上运行时出错。需要帮助。

public void imageload(View v)
    {
        switch (v.getId()) {


            case imageView_new_customer:
                final CharSequence[] options = {"Take Photo", "Choose from Gallery", "Cancel"};

                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("Add Photo!");
                builder.setItems(options, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int item) {
                        if (options[item].equals("Take Photo")) {
                            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                            ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
                            File directory = contextWrapper.getDir("Image", Context.MODE_PRIVATE);
                            File f = new File(Environment.getExternalStorageDirectory(), "temp.jpg");
                            intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
                            startActivityForResult(intent, 1);
                        } else if (options[item].equals("Choose from Gallery")) {
                            Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                            startActivityForResult(intent, 2);

                        } else if (options[item].equals("Cancel")) {
                            dialog.dismiss();
                        }
                    }
                });
                builder.show();
                break;
        }
    }

种植活动：

if (getIntent().getStringExtra("Source").equals("camera"))
{
    // Set image for cropping
    ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
File directory = contextWrapper.getDir("Image", Context.MODE_PRIVATE);
File f = new File(Environment.getExternalStorageDirectory().toString());


for (File temp : f.listFiles()) {
    if (temp.getName().equals("temp.jpg")) {
        f = temp;
        break;
    }
}

错误：

 java.lang.RuntimeException: Unable to start activity ComponentInfo{loginscreen.example.com.girviapp/loginscreen.example.com.girviapp.CropImage}: java.lang.NullPointerException: Attempt to get length of null array
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2555)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2629)
            at android.app.ActivityThread.access$800(ActivityThread.java:182)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1474)
            at android.os.Handler.dispatchMessage(Handler.java:111)
            at android.os.Looper.loop(Looper.java:194)
            at android.app.ActivityThread.main(ActivityThread.java:5706)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1033)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)
     Caused by: java.lang.NullPointerException: Attempt to get length of null array
            at loginscreen.example.com.girviapp.CropImage.onCreate(CropImage.java:43)
            at android.app.Activity.performCreate(Activity.java:6092)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2502)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2629)
            at android.app.ActivityThread.access$800(ActivityThread.java:182)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1474)
            at android.os.Handler.dispatchMessage(Handler.java:111)
            at android.os.Looper.loop(Looper.java:194)
            at android.app.ActivityThread.main(ActivityThread.java:5706)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1033)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)
4

3 回答 3

0 
1.<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />

2.public int REQUEST_CAMERA = 0, SELECT_FILE = 1;    
 final CharSequence[] items = {"Take Photo", "Choose from Library",
            "Cancel"};
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("Add Photo!");
    builder.setItems(items, new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int item) {
            if (items[item].equals("Take Photo")) {
                userChoosenTask = "Take Photo";
                if (result)
                    cameraIntent();
            } else if (items[item].equals("Choose from Library")) {
                userChoosenTask = "Choose from Library";
                if (result)
                    galleryIntent();
            } else if (items[item].equals("Cancel")) {
                dialog.dismiss();
            }
        }
    });
    builder.show();
3. private void cameraIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
        String fileName = "temp.jpg";
        ContentValues values = new ContentValues();
        values.put(MediaStore.Images.Media.TITLE, fileName);
        uri = getActivity().getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                values);
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        startActivityForResult(takePictureIntent, REQUEST_CAMERA);
    }
}
4.private void galleryIntent() {
    Intent intentPickImage = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intentPickImage, SELECT_FILE);
}
5.@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK) {
        if (requestCode == SELECT_FILE) {
            Uri uri = data.getData();
            try {
                bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);
            } catch (IOException e) {
                e.printStackTrace();
            }
            onSelectFromGalleryResult(data);
        } else if (requestCode == REQUEST_CAMERA) {
            onCaptureImageResult(data);
        }  else {
            Toast.makeText(getActivity(), "You haven't picked Image", Toast.LENGTH_SHORT).show();
        }
    }
}
6.private void onSelectFromGalleryResult(Intent data) {
    if (data != null) {
        try {
            Uri uri = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};
            Cursor cursor = getActivity().getContentResolver().query(uri,
                    filePathColumn, null, null, null);

            if (cursor == null || cursor.getCount() < 1) {
                return; // no cursor or no record. DO YOUR ERROR HANDLING
            }
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            PicturePath = cursor.getString(columnIndex);
            if (columnIndex < 0) // no column index
                return; // DO YOUR ERROR HANDLING
            String image = getStringImage(bitmap);
            PicturePath = cursor.getString(columnIndex);
            String filename=PicturePath.substring(PicturePath.lastIndexOf("/")+1);
            txtFilePath.setText(filename);
            cursor.close(); // close cursor
        } catch (Exception e) {
            e.printStackTrace();
        }
    } else {
        Toast.makeText(getActivity(), "No Data Found", Toast.LENGTH_SHORT).show();
    }
}
7. public void onCaptureImageResult(Intent data) {
    String[] projection = {MediaStore.Images.Media.DATA};
    Cursor cursor = getActivity().managedQuery(uri, projection, null,
            null, null);
    int column_index_data = cursor.getColumnIndexOrThrow(
            MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    PicturePath = cursor.getString(column_index_data);
    String filename=PicturePath.substring(PicturePath.lastIndexOf("/")+1);
    txtFilePath.setText(filename);
}
于 2017-06-01T06:10:21.300 回答
0

问题似乎与 CropImage.java 第 43 行有关，但除了堆栈跟踪说它在空数组上调用 .length() 之外，我看不到源来说明问题可能是什么

于 2016-06-05T10:09:16.667 回答
0

您正在将该行中的 thr uri 转换为字符串 remove .toString() 方法，而不是使用图像的路径，例如 File f=new File(Environment.getExternalStorageDirectory()+"/your_directory_name");

于 2016-06-05T11:24:29.977 回答