java - 保存裁剪后的图像后为 "Unable to resume activity"- Android

Question

我想在裁剪图像后将图像加载到ImageView中并保存。但是当它恢复时，它会崩溃，但图像正在保存在选定的位置。我认为问题出在 selectedImageUri 中。但我不知道如何解决。请有人帮忙。提前致谢。

代码:

public class CatFragment extends Fragment implements OnClickListener{

            private DBCreater dbCreate;

            private static final int SELECT_PICTURE = 1;

            private String selectedImagePath = "android.resource://com.example.abcd/" + R.drawable.pets;
            private ImageView img;
            //private Button imgBtn;

            private Uri mCropImagedUri;

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                    Bundle savedInstanceState) {
                View gv = inflater.inflate(R.layout.new_pet, null);

                Spinner sp = (Spinner) gv.findViewById(R.id.ETPetType); 
                // get reference 
                sp.setAdapter(new ArrayAdapter<String>(getActivity().getBaseContext(), android.R.layout.simple_spinner_dropdown_item, petType));

                Button btnSubmit = (Button) gv.findViewById(R.id.ButtonNext);
                btnSubmit.setOnClickListener(this);

                img = (ImageView)gv.findViewById(R.id.ImageView01);
            ((Button) gv.findViewById(R.id.ETPetImg))
                            .setOnClickListener(new OnClickListener() {
                                public void onClick(View arg0) {
                                    try {
                                        Intent intent = new Intent();
                                        intent.setType("image/*");
                                        intent.setAction(Intent.ACTION_GET_CONTENT);
                                        intent.putExtra("crop", "true");
                                        intent.putExtra("aspectX", 0);
                                        intent.putExtra("aspectY", 0);
                                        intent.putExtra("outputX", 200);
                                        intent.putExtra("outputY", 200);
                                        intent.putExtra("return-data", false);

                                        File f = createNewFile("CROP_");
                                        try {
                                            f.createNewFile();
                                        } catch (IOException ex) {
                                            Log.e("io", ex.getMessage());
                                        }

                                        mCropImagedUri = Uri.fromFile(f);
                                        intent.putExtra(MediaStore.EXTRA_OUTPUT,
                                                mCropImagedUri);
                                        // start the activity - we handle returning in
                                        // onActivityResult
                                        startActivityForResult(intent, SELECT_PICTURE);
                                                                } catch (ActivityNotFoundException anfe) {
                                        // display an error message

                                    }
                                }
                            });

                    return gv;

                }


                private File createNewFile(String prefix){
                    if(prefix==null || "".equalsIgnoreCase(prefix)){
                        prefix="IMG_";
                    }
                    File newDirectory = new File(Environment.getExternalStorageDirectory()+"/test1/");
                    if(!newDirectory.exists()){
                        if(newDirectory.mkdir()){
                            Log.d(this.getClass().getName(), newDirectory.getAbsolutePath()+" directory created");
                        }
                    }
                    File file = new File(newDirectory,(prefix+System.currentTimeMillis()+".jpg"));
                    if(file.exists()){
                        //this wont be executed
                        file.delete();
                        try {
                            file.createNewFile();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }

                    return file;
                }


                public void onActivityResult(int requestCode, int resultCode, Intent data) {
                    if (resultCode == Activity.RESULT_OK) {
                        if (requestCode == SELECT_PICTURE) {
                            Uri selectedImageUri = data.getData();
                            selectedImagePath = getPath(selectedImageUri); //To get image path
                            System.out.println("Image Path : " + selectedImagePath);
                            img.setImageURI(selectedImageUri);


                        }
                    }
                }

    public String getPath(Uri uri) {
            String[] projection = { MediaStore.Images.Media.DATA };
            //Cursor cursor = managedQuery(uri, projection, null, null, null);
            Cursor cursor = getActivity().getContentResolver().query(uri, projection, null, null, null);
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        }

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            //access the database
            dbCreate = new DBCreater(getActivity());

        }



        @Override
        public void onClick(View v) {
            displayNextAlert();

        }

日志猫:

7214): FATAL EXCEPTION: main
11-15 07:15:38.215: E/AndroidRuntime(27214): java.lang.RuntimeException: Unable to resume activity {com.example.abcd/com.example.abcd.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=1, result=-1, data=Intent { (has extras) }} to activity {com.example.abcd/com.example.abcd.MainActivity}: java.lang.NullPointerException
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2919)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2948)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2354)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.access$700(ActivityThread.java:159)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.os.Looper.loop(Looper.java:176)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.main(ActivityThread.java:5419)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at java.lang.reflect.Method.invokeNative(Native Method)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at java.lang.reflect.Method.invoke(Method.java:525)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at dalvik.system.NativeStart.main(Native Method)
11-15 07:15:38.215: E/AndroidRuntime(27214): Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=1, result=-1, data=Intent { (has extras) }} to activity {com.example.abcd/com.example.abcd.MainActivity}: java.lang.NullPointerException
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3500)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2906)
11-15 07:15:38.215: E/AndroidRuntime(27214):    ... 12 more
11-15 07:15:38.215: E/AndroidRuntime(27214): Caused by: java.lang.NullPointerException
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1147)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.content.ContentResolver.query(ContentResolver.java:401)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.content.ContentResolver.query(ContentResolver.java:360)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at com.example.abcd.NewPetsFragment.getPath(NewPetsFragment.java:155)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at com.example.abcd.NewPetsFragment.onActivityResult(NewPetsFragment.java:143)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.Activity.dispatchActivityResult(Activity.java:5567)
11-15 07:15:38.215: E/AndroidRuntime(27214):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3496)
11-15 07:15:38.215: E/AndroidRuntime(27214):    ... 13 more

编辑:

我像这样更改了 OnActivityResult():

if(data!=null) { 
                     Bitmap thePic = (Bitmap) data.getExtras().get("data");
                     SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getBaseContext());
                     String filename = preferences.getString("file_name", ""); // value to retrieve
                     String path = Environment.getExternalStorageDirectory()+"/PetSitter/Pet Images/" + filename;
                     img.setImageURI(Uri.parse(path.toString()));
                     } else {
                     // In createNewFile, make sure you already saved the filename (prefix+System.currentTimeMillis()+".jpg"), for example, to sharedpreferences then get the filename and apply in path 
                     SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getBaseContext());
                     String filename = preferences.getString("file_name", ""); // value to retrieve
                     String path = Environment.getExternalStorageDirectory()+"/PetSitter/Pet Images/" + filename;
                     BitmapFactory.Options bfo = new BitmapFactory.Options();
                     bfo.inSampleSize = 1;
                     Bitmap bmp = BitmapFactory.decodeFile(path, bfo);
                     img.setImageBitmap(bmp);
                    }

它似乎可以处理图像预览和所有内容。但做什么事呢？这是一个好的做法吗？这样使用的话内存使用情况如何？

Answer 1

在 OnActivityResult() 中:

             if(data!=null) { 
             Bitmap thePic = (Bitmap) data.getExtras().get("data");
             img.setImageBitmap(thePic);
             } else {
             // In createNewFile, make sure you already saved the filename (prefix+System.currentTimeMillis()+".jpg"), for example, to sharedpreferences then get the filename and apply in path 
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getBaseContext());
String filename = preferences.getString("file_name", ""); // value to retrieve
             String path = Environment.getExternalStorageDirectory()+"/test1/" + filename;
             BitmapFactory.Options bfo = new BitmapFactory.Options();
             bfo.inSampleSize = 1;
             Bitmap bmp = BitmapFactory.decodeFile(path, bfo);
             img.setImageBitmap(bmp);
            }

在创建新文件

                private File createNewFile(String prefix){
                        if(prefix==null || "".equalsIgnoreCase(prefix)){
                            prefix="IMG_";
                        }
                        File newDirectory = new File(Environment.getExternalStorageDirectory()+"/test1/");
                        if(!newDirectory.exists()){
                            if(newDirectory.mkdir()){
                                Log.d(this.getClass().getName(), newDirectory.getAbsolutePath()+" directory created");
                            }
                        }
    // modifications applied here
    long mDate = System.currentTimeMillis();
                        File file = new File(newDirectory,(prefix+mDate+".jpg"));
String filename = prefix+mDate+".jpg";
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getBaseContext());
SharedPreferences.Editor editor = preferences.edit();
editor.putString("file_name", filename); // value to store
editor.commit();
                        if(file.exists()){
                            //this wont be executed
                            file.delete();
                            try {
                                file.createNewFile();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }

                        return file;
                    }