我无法找到无法恢复活动的问题的根本原因。我做错了我的应用程序崩溃一旦我在画廊选择和从相机中选择之间进行随机选择:(
编辑：完整logcat：
04-05 12:30:07.479: W/IInputConnectionWrapper(17228): showStatusIcon on inactive InputConnection
04-05 12:30:17.109: I/RotateImage(17228): Exif orientation: 6
04-05 12:30:17.109: I/RotateImage(17228): Rotate value: 90
04-05 12:30:20.139: E/Swiss Insignia(17228): width=1920
04-05 12:30:20.139: E/Swiss Insignia(17228): height=2560
04-05 12:30:21.609: I/System.out(17228): str1=L@**
04-05 12:30:31.229: I/RotateImage(17228): Exif orientation: 6
04-05 12:30:31.229: I/RotateImage(17228): Rotate value: 90
04-05 12:30:33.949: E/Swiss Insignia(17228): width=1920
04-05 12:30:33.949: E/Swiss Insignia(17228): height=2560
04-05 12:30:35.089: I/System.out(17228): str2=L@**
04-05 12:30:37.909: W/IInputConnectionWrapper(17228): showStatusIcon on inactive InputConnection
04-05 12:30:45.829: I/Swiss Insignia(17456): Trying to load OpenCV library
04-05 12:30:45.889: D/SKIA_FONT(17456): load_system_fonts(), name = Roboto, style = 0, uniqueID = 1
04-05 12:30:45.889: D/SKIA_FONT(17456): load_system_fonts(), name = Roboto, style = 1, uniqueID = 2
04-05 12:30:45.889: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Serif, style = 0, uniqueID = 3
04-05 12:30:45.889: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Serif, style = 1, uniqueID = 4
04-05 12:30:45.889: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Serif, style = 2, uniqueID = 5
04-05 12:30:45.899: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Serif, style = 3, uniqueID = 6
04-05 12:30:45.899: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Sans Mono, style = 0, uniqueID = 7
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Sans Arabic, style = 0, uniqueID = 8
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Sans Hebrew, style = 0, uniqueID = 9
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = SamsungArmenian, style = 0, uniqueID = 10
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = SamsungGeorgian, style = 0, uniqueID = 11
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Sans Thai, style = 0, uniqueID = 12
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = HelveM_Telugu, style = 0, uniqueID = 13
04-05 12:30:45.909: D/SKIA_FONT(17456): load_system_fonts(), name = Droid Sans Fallback, style = 0, uniqueID = 14
04-05 12:30:45.919: D/SKIA_FONT(17456): load_system_fonts(), oldSansUID = 0, newSansUID = 1
04-05 12:30:45.919: D/SKIA_FONT(17456): load_system_fonts(), oldSansBoldUID = 0, newSansBoldUID = 2
04-05 12:30:45.969: W/dalvikvm(17456): threadid=1: thread exiting with uncaught exception (group=0x40018578)
04-05 12:30:45.989: E/AndroidRuntime(17456): FATAL EXCEPTION: main
04-05 12:30:45.989: E/AndroidRuntime(17456): java.lang.RuntimeException: Unable to resume activity {.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {.MainActivity}: java.lang.NullPointerException
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.os.Handler.dispatchMessage(Handler.java:99)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.os.Looper.loop(Looper.java:130)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.main(ActivityThread.java:3687)
04-05 12:30:45.989: E/AndroidRuntime(17456): at java.lang.reflect.Method.invokeNative(Native Method)
04-05 12:30:45.989: E/AndroidRuntime(17456): at java.lang.reflect.Method.invoke(Method.java:507)
04-05 12:30:45.989: E/AndroidRuntime(17456): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
04-05 12:30:45.989: E/AndroidRuntime(17456): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
04-05 12:30:45.989: E/AndroidRuntime(17456): at dalvik.system.NativeStart.main(Native Method)
04-05 12:30:45.989: E/AndroidRuntime(17456): Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {.MainActivity}: java.lang.NullPointerException
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2111)
04-05 12:30:45.989: E/AndroidRuntime(17456): ... 12 more
04-05 12:30:45.989: E/AndroidRuntime(17456): Caused by: java.lang.NullPointerException
04-05 12:30:45.989: E/AndroidRuntime(17456): at .onActivityResult(MainActivity.java:101)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.Activity.dispatchActivityResult(Activity.java:3908)
04-05 12:30:45.989: E/AndroidRuntime(17456): at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
04-05 12:30:45.989: E/AndroidRuntime(17456): ... 13 more
代码：
public class MainActivity extends Activity
{
private static final int PICK_FROM_CAMERA = 1;
private static final int PICK_FROM_GALLERY = 2;
final String TAG = "Swiss Insignia";
ImageView imgview;
TextView output;
Button buttonCamera;
Button buttonGallery;
File destImage;
private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this)
{@Override
public void onManagerConnected(int status)
{
switch (status)
{
case LoaderCallbackInterface.SUCCESS:
{
Log.i(TAG, "opencv loaded successfully");
// Create and set View
System.loadLibrary("SwissInsignia");
Log.i(TAG, "libSwissInsignia.so loaded successfully");
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Log.i(TAG, "Trying to load OpenCV library");
if (!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_2, this, mOpenCVCallBack))
{
Log.e(TAG, "Cannot connect to OpenCV Manager");
}
setContentView(R.layout.activity_main);
imgview = (ImageView) findViewById(R.id.imageView1);
output = (TextView)findViewById(R.id.textViewOutput);
buttonCamera = (Button) findViewById(R.id.btn_take_camera);
buttonGallery = (Button) findViewById(R.id.btn_select_gallery);
buttonCamera.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "SwissInsignia");
if (!dir.isDirectory())
{
dir.mkdir();
}
destImage = new File(dir, new Date().getTime() + ".jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(destImage));
startActivityForResult(intent, PICK_FROM_CAMERA);
}
});
buttonGallery.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, PICK_FROM_GALLERY);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == PICK_FROM_CAMERA)
{
File f = new File(destImage.getAbsolutePath());
int rotateImage = getCameraPhotoOrientation(this, Uri.parse(destImage.getAbsolutePath()), destImage.getAbsolutePath());
Bitmap photo= convertBitmapToCorrectOrientation( BitmapFactory.decodeFile(f.getAbsolutePath()), rotateImage);
//Bitmap photo = BitmapFactory.decodeFile(f.getAbsolutePath());
Log.e(TAG, "width="+photo.getWidth());
Log.e(TAG, "height="+photo.getHeight());
Mat mRgba=new Mat();
org.opencv.android.Utils.bitmapToMat(photo,mRgba);
String str1=findFeatures(mRgba.getNativeObjAddr());
System.out.println("str1="+str1);
imgview.setImageBitmap(photo);
output.setText("Detected Pattern="+str1);
}
if (requestCode == PICK_FROM_GALLERY)
{
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
int rotateImage = getCameraPhotoOrientation(this, selectedImage, picturePath);
Bitmap photo= convertBitmapToCorrectOrientation( BitmapFactory.decodeFile(picturePath), rotateImage);
Log.e(TAG, "width="+photo.getWidth());
Log.e(TAG, "height="+photo.getHeight());
Mat mRgba=new Mat();
org.opencv.android.Utils.bitmapToMat(photo,mRgba);
String str2=findFeatures(mRgba.getNativeObjAddr());
System.out.println("str2="+str2);
Bitmap mutableBitmap = photo.copy(Bitmap.Config.ARGB_8888, true);
imgview.setImageBitmap(mutableBitmap);
output.setText("Detected Pattern="+str2);
}
}
public static Bitmap convertBitmapToCorrectOrientation(Bitmap photo,int rotation)
{
int width = photo.getWidth();
int height = photo.getHeight();
Matrix matrix = new Matrix();
matrix.preRotate(rotation);
return Bitmap.createBitmap(photo, 0, 0, width, height, matrix, false);
}
public int getCameraPhotoOrientation(Context context, Uri imageUri, String imagePath)
{
int rotate = 0;
try
{
context.getContentResolver().notifyChange(imageUri, null);
File imageFile = new File(imagePath);
ExifInterface exif = new ExifInterface(imageFile.getAbsolutePath());
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;
}
Log.i("RotateImage", "Exif orientation: " + orientation);
Log.i("RotateImage", "Rotate value: " + rotate);
}
catch (Exception e)
{
e.printStackTrace();
}
return rotate;
}
public static native String findFeatures( long matAddrRgba);
}
答案 0 :(得分：1)
问题很简单当你从相机回来时你的活动正在重新启动这是因为相机使用大量资源来工作因此 destImage 将为空
因此使用onSaveInstanceState 来保存这些变量之王并从Bundle savedInstanceState中恢复它们的onCreate
OR
使用
destImage = new File(dir, "sample.jpg");
位于onCreate()而不是onClick()
修改
同样使用resultCode == RESULT_OK
检查结果是否正常protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if(resultCode== RESULT_OK )
{
if (requestCode == PICK_FROM_CAMERA)
{
File f = new File(destImage.getAbsolutePath());
int rotateImage = getCameraPhotoOrientation(this, Uri.parse(destImage.getAbsolutePath()), destImage.getAbsolutePath());
Bitmap photo= convertBitmapToCorrectOrientation( BitmapFactory.decodeFile(f.getAbsolutePath()), rotateImage);
//Bitmap photo = BitmapFactory.decodeFile(f.getAbsolutePath());
Log.e(TAG, "width="+photo.getWidth());
Log.e(TAG, "height="+photo.getHeight());
imgview.setImageBitmap(photo);
output.setText("Detected Pattern=");
}
if (requestCode == PICK_FROM_GALLERY)
{
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
int rotateImage = getCameraPhotoOrientation(this, selectedImage, picturePath);
Bitmap photo= convertBitmapToCorrectOrientation( BitmapFactory.decodeFile(picturePath), rotateImage);
Log.e(TAG, "width="+photo.getWidth());
Log.e(TAG, "height="+photo.getHeight());
Bitmap mutableBitmap = photo.copy(Bitmap.Config.ARGB_8888, true);
imgview.setImageBitmap(mutableBitmap);
output.setText("Detected Pattern=");
}
}
}