保存裁剪图像后“无法恢复活动” - Android答案

【问题标题】："Unable to resume activity" after saving cropped image - Android保存裁剪图像后“无法恢复活动” - Android
【发布时间】：2014-11-15 11:42:39
【问题描述】：

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，但图像会保存在选定的位置。我认为问题出在 selectedImageUri 中。但我无法弄清楚如何解决。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();

        }

LogCat：

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

已编辑：

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);
                    }

它似乎正在处理图像预览和一切。但是做什么呢？这是一个好习惯吗？以及这样使用的内存使用情况如何？

【问题讨论】：

我刚刚在下面发布了我的答案

标签： java android eclipse android-intent android-fragments

【解决方案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 createNewFile 中

                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;
                    }

【讨论】：

'文件 file = new File(newDirectory,(prefix+System.currentTimeMillis()+".jpg"));'在 'createNewFile(String prefix)' 我怎么能在这里调用？
我使用了'selectedImagePath = mCropImagedUri.getPath(); //获取图片路径'获取文件名。但它没有显示在 ImageView 中。我用的方式对吗？
否 - 您需要使用 sharedpreferences 或保存文件名的临时数据库获取文件名，因为您在文件名中使用了 system.currenttimemillis。你知道如何将文件名保存到 sharedpreferences 中吗？
不，我该如何实现它？
查看上面的编辑答案 - 如何使用 sharedpreferences

【解决方案2】：

Uri selectedImageURI = data.getData();
imageFile = new File(getRealPathFromURI(selectedImageURI));

和

    private String getRealPathFromURI(Uri contentURI) {
    Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
    if (cursor == null) { // Source is Dropbox or other similar local file path
        return contentURI.getPath();
    } else { 
        cursor.moveToFirst(); 
        int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
        return cursor.getString(idx); 
    }
}

【讨论】：

'getContentResolver()' 出现错误，如何将 'File' 设置为 'ImageView'（我的意思是 imageFile）？
现在我收到此错误：'11-15 13:48:46.351: E/AndroidRuntime(19350): java.lang.RuntimeException: 传递结果失败 ResultInfo{who=android:fragment: 0, request=1, result=-1, data=Intent { (has extras) }} 到活动 {com.example.abcd/com.example.abcd.MainActivity}: java.lang.NullPointerException'

【解决方案3】：

在onActivityResult试试这个

Bitmap photo = (Bitmap) data.getExtras().get("data"); 
                img.setImageBitmap(photo);

【讨论】：

谢谢。但是现在我收到了这个错误：'11-15 13:48:46.351: E/AndroidRuntime(19350): java.lang.RuntimeException: Failure delivery result ResultInfo{who=android:fragment:0, request=1, result =-1, data=Intent { (has extras) }} 到活动 {com.example.abcd/com.example.abcd.MainActivity}: java.lang.NullPointerException'
您正在使用 Fragments，因此活动处于丢失状态。请参考这个androiddesignpatterns.com/2013/08/…和stackoverflow.com/questions/16265733/…
感谢链接，但我该如何实现它？
确定添加 super.onActivityResult(requestCode,resultCode, data);作为 onActivityResult 的第一行

【解决方案4】：

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);
                    }

它似乎正在处理图像预览和一切。

【讨论】：