アンドロイドでカメラからビットマップを取得するにはどうすればよいですか？

Question

CODE：

public void startCameraActivity(){ 
     Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) { 
      startActivityForResult(cameraIntent, 1000); 
     } 
    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if(resultCode == Activity.RESULT_OK) { 
      if (requestCode == 1000){ 
       File photo = new File(Environment.getExternalStorageDirectory(), ".camera.jpg"); 
       OutputStream out = null; 
       String imagePath = data.getData().getPath(); 
       Bitmap image = BitmapFactory.decodeFile(imagePath); 
       ExifInterface exif = null; 

       try { 
        exif = new ExifInterface(imagePath); 

        int exifOrientation = exif.getAttributeInt(
          ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); 
        int exifDegree = exifOrientationToDegrees(exifOrientation); 
        image = rotate(image, exifDegree); 
        photo.createNewFile(); 
        out = new FileOutputStream(Environment.getExternalStorageDirectory()); 
        image.compress(Bitmap.CompressFormat.PNG, 100, out); 
        out.close(); 
       } catch (IOException e) { 
        Toast.makeText(getContext(), "hello error", Toast.LENGTH_LONG).show(); 
       } 
       returnUri = Uri.fromFile(photo); 
      } 
      Glide.with(this) 
        .load(returnUri) 
        .into(mImageview); 
     } 
    } 

それは私がカメラから画像を取得するコードを作った画像回転のため

public int exifOrientationToDegrees(int exifOrientation) 
    { 
     if(exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) 
     {return 90;} 
     else if(exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) 
     {return 180;} 
     else if(exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) 
     {return 270;} 
     return 0; 
    } 
    public Bitmap rotate(Bitmap bitmap, int degrees) 
    { 
     if(degrees != 0 && bitmap != null) 
     { 
      Matrix m = new Matrix(); 
      m.setRotate(degrees, (float) bitmap.getWidth()/2, 
        (float) bitmap.getHeight()/2); 

      try 
      { 
       Bitmap converted = Bitmap.createBitmap(bitmap, 0, 0, 
         bitmap.getWidth(), bitmap.getHeight(), m, true); 
       if(bitmap != converted) 
       { 
        bitmap.recycle(); 
        bitmap = converted; 
       } 
      } 
      catch(OutOfMemoryError ex) 
      { 
      } 
     } 
     return bitmap; 
    } 

です。カメラから来た

しかし、その絵は、間違った方向を有します。

だから私は、その画像を回転させるために検索。

が、コードの上にはない作品を行います。

どこに問題がありますか？ どうすれば修正できますか？

Androidのモニターは

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=66536, result=-1, data=Intent { act=inline-data dat=content://media/external/images/media/8464 flg=0x1 (has extras) }} to activity {~~!@.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference 


Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference 

EDITフルlogcat

11-03 11:21:42.060 16104-16104/? E/AndroidRuntime: FATAL EXCEPTION: main 
                Process: com.keepair.www.pinair, PID: 16104 
                java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=66536, result=-1, data=Intent { act=inline-data dat=content://media/external/images/media/8465 flg=0x1 (has extras) }} to activity {com.keepair.www.pinair/com.keepair.www.pinair.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference 
                 at android.app.ActivityThread.deliverResults(ActivityThread.java:4173) 
                 at android.app.ActivityThread.handleSendResult(ActivityThread.java:4216) 
                 at android.app.ActivityThread.access$1400(ActivityThread.java:181) 
                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523) 
                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                 at android.os.Looper.loop(Looper.java:145) 
                 at android.app.ActivityThread.main(ActivityThread.java:6117) 
                 at java.lang.reflect.Method.invoke(Native Method) 
                 at java.lang.reflect.Method.invoke(Method.java:372) 
                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) 
                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194) 
                Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference 
                 at com.keepair.www.pinair.GreenFragment.onActivityResult(GreenFragment.java:296) 
                 at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:165) 
                 at android.app.Activity.dispatchActivityResult(Activity.java:6632) 
                 at android.app.ActivityThread.deliverResults(ActivityThread.java:4169) 
                 at android.app.ActivityThread.handleSendResult(ActivityThread.java:4216)  
                 at android.app.ActivityThread.access$1400(ActivityThread.java:181)  
                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523)  
                 at android.os.Handler.dispatchMessage(Handler.java:102)  
                 at android.os.Looper.loop(Looper.java:145)  
                 at android.app.ActivityThread.main(ActivityThread.java:6117)  
                 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:1399)  
                 at 

com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1194）まず

Answer 1

これは私が書いたものです。試してみてください。以下は

public static final int PICK_USER_PROFILE_IMAGE = 1000; 
public void startCameraActivity(){ 
     Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) { 
      startActivityForResult(cameraIntent, PICK_USER_PROFILE_IMAGE); 
     } 
    } 

    @Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 

    if (resultCode == RESULT_OK) { 
     if (requestCode == Constants.PICK_USER_PROFILE_IMAGE) { 
      if (resultCode == RESULT_OK) { 
       Bitmap bmp = ImagePicker.getImageFromResult(this, resultCode, data); 
       //your compressed rotated bitmap here 

      } 
     } 
    } 
} 

ImagePickerクラスは、圧縮だけでなく、画像の回転を処理するすべてのメソッドを持っている、あなたの仕事をするために一連のメソッドを持つクラスImagePicker

public class ImagePicker { 

private static final int DEFAULT_MIN_WIDTH_QUALITY = 400;  // min pixels 
private static final String TAG = "ImagePicker"; 
private static final String TEMP_IMAGE_NAME = "tempImage"; 

public static int minWidthQuality = DEFAULT_MIN_WIDTH_QUALITY; 

public static Bitmap getImageFromResult(Context context, int resultCode, 
             Intent imageReturnedIntent) { 
    Log.d(TAG, "getImageFromResult, resultCode: " + resultCode); 
    Bitmap bm = null; 
    File imageFile = getTempFile(context); 
    if (resultCode == Activity.RESULT_OK) { 
     Uri selectedImage; 
     boolean isCamera = (imageReturnedIntent == null || 
       imageReturnedIntent.getData() == null || 
       imageReturnedIntent.getData().equals(Uri.fromFile(imageFile))); 
     if (isCamera) {  /** CAMERA **/ 
      selectedImage = Uri.fromFile(imageFile); 
     } else {   /** ALBUM **/ 
      selectedImage = imageReturnedIntent.getData(); 
     } 
     Log.d(TAG, "selectedImage: " + selectedImage); 

     bm = getImageResized(context, selectedImage); 
     int rotation = getRotation(context, selectedImage, isCamera); 
     bm = rotate(bm, rotation); 
    } 
    return bm; 
} 


private static Bitmap decodeBitmap(Context context, Uri theUri, int sampleSize) { 
    BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inSampleSize = sampleSize; 

    AssetFileDescriptor fileDescriptor = null; 
    try { 
     fileDescriptor = context.getContentResolver().openAssetFileDescriptor(theUri, "r"); 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } 

    Bitmap actuallyUsableBitmap = BitmapFactory.decodeFileDescriptor(
      fileDescriptor.getFileDescriptor(), null, options); 

    Log.d(TAG, options.inSampleSize + " sample method bitmap ... " + 
      actuallyUsableBitmap.getWidth() + " " + actuallyUsableBitmap.getHeight()); 

    return actuallyUsableBitmap; 
} 

/** 
* Resize to avoid using too much memory loading big images (e.g.: 2560*1920) 
**/ 
private static Bitmap getImageResized(Context context, Uri selectedImage) { 
    Bitmap bm = null; 
    int[] sampleSizes = new int[]{5, 3, 2, 1}; 
    int i = 0; 
    do { 
     bm = decodeBitmap(context, selectedImage, sampleSizes[i]); 
     Log.d(TAG, "resizer: new bitmap width = " + bm.getWidth()); 
     i++; 
    } while (bm.getWidth() < minWidthQuality && i < sampleSizes.length); 
    return bm; 
} 


private static int getRotation(Context context, Uri imageUri, boolean isCamera) { 
    int rotation; 
    if (isCamera) { 
     rotation = getRotationFromCamera(context, imageUri); 
    } else { 
     rotation = getRotationFromGallery(context, imageUri); 
    } 
    Log.d(TAG, "Image rotation: " + rotation); 
    return rotation; 
} 

private static int getRotationFromCamera(Context context, Uri imageFile) { 
    int rotate = 0; 
    try { 

     context.getContentResolver().notifyChange(imageFile, null); 
     ExifInterface exif = new ExifInterface(imageFile.getPath()); 
     int orientation = exif.getAttributeInt(
       ExifInterface.TAG_ORIENTATION, 
       ExifInterface.ORIENTATION_NORMAL); 

     switch (orientation) { 
      case ExifInterface.ORIENTATION_ROTATE_270: 
       rotate = 270; 
       break; 
      case ExifInterface.ORIENTATION_ROTATE_180: 
       rotate = 180; 
       break; 
      case ExifInterface.ORIENTATION_ROTATE_90: 
       rotate = 90; 
       break; 
     } 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    return rotate; 
} 

public static int getRotationFromGallery(Context context, Uri imageUri) { 
    String[] columns = {MediaStore.Images.Media.ORIENTATION}; 
    Cursor cursor = context.getContentResolver().query(imageUri, columns, null, null, null); 
    if (cursor == null) return 0; 

    cursor.moveToFirst(); 

    int orientationColumnIndex = cursor.getColumnIndex(columns[0]); 
    return cursor.getInt(orientationColumnIndex); 
} 


private static Bitmap rotate(Bitmap bm, int rotation) { 
    if (rotation != 0) { 
     Matrix matrix = new Matrix(); 
     matrix.postRotate(rotation); 
     Bitmap bmOut = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true); 
     return bmOut; 
    } 
    return bm; 
} 


private static File getTempFile(Context context) { 
     File imageFile = new File(context.getExternalCacheDir(), TEMP_IMAGE_NAME); 
     imageFile.getParentFile().mkdirs(); 
     return imageFile; 
    } 
} 

です。

はそれが

Answer 2

語りますおそらくこの行をチェックアウトする必要があります：

if(degrees != 0 && bitmap != null) 

このライン偽、「ヌル」が返され、モニターがエラーことを与える場合。

Answer 3

のためにあなたがcameraIntentに設定されているパスに撮影した画像を得ることができます撮影した画像の後

Intent cameraIntent = new Intent(
       android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); 
this.startActivityForResult(cameraIntent, 101); 

を使用して撮影画像の実際の画像あらかじめ定義されたパスを取得します。あらかじめ定義されたパスを設定したくない場合は、インテントデータをチェックしてください。

if (resultCode == android.app.Activity.RESULT_OK && requestCode == 101) { 
       try { 

        path_mm = "Onsuccess_resultcode"; 
        generateNoteOnSD("photo34.txt", path_mm); 
        Bitmap photo = null; 
        if (data == null) { 
        //get Bitmap here. 
        } 
       else { 
        Uri u1 = data.getData(); 
        //get uri and find actual path on that uri. 
        } 
        }catch(Exception ex) 
        {}}