我真的很沮丧地解决了我的问题，我有一个使用相机的应用程序，当相机拍摄照片时，它会显示在活动上，当我不使用cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);照片时会显示活动，但名称和路径文件不是我想要的。我正在使用galaxy选项卡进行编译，我已经按照教程从here，here和here解决了我的问题，但我的应用程序仍然强制关闭和错误，这是我的代码：
{
File sdCard= Environment.getExternalStorageDirectory();
File path = new File (sdCard.getAbsolutePath() + "/android/data/spaj_foto");
path.mkdir();
File file= new File (path,"spaj_foto.png");
String filePath ="/android/data/spaj_foto/spaj_foto.png";
try {
file.createNewFile();
} catch (IOException e) {}
mPhotoUri = Uri.fromFile(file);
values.put( MediaStore.Images.ImageColumns.DATA, file.getPath());
mPhotoUri=getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);
startActivityForResult(cameraIntent,TAKE_PHOTO_CODE );
}
activityresult方法：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
image_spaj.setImageBitmap(photo);
// CALL THIS METHOD TO GET THE URI FROM THE BITMAP
Uri tempUri = getImageUri(getApplicationContext(), photo);
// CALL THIS METHOD TO GET THE ACTUAL PATH
File finalFile = new File(getRealPathFromURI(tempUri));
// System.out.println(mImageCaptureUri);
}
}
public String getRealPathFromURI(Uri mPhotoUri) {
Cursor cursor = getContentResolver().query(mPhotoUri, null, null, null, null);
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
return cursor.getString(idx);
}
public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
这是我的logcat说：
09-27 10:59:43.186: E/AndroidRuntime(31318): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=null} to activity {org.example.touch/org.example.touch.FormSpaj}: java.lang.NullPointerException
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.ActivityThread.deliverResults(ActivityThread.java:3179)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3222)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.ActivityThread.access$1100(ActivityThread.java:140)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1276)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.os.Handler.dispatchMessage(Handler.java:99)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.os.Looper.loop(Looper.java:137)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.ActivityThread.main(ActivityThread.java:4895)
09-27 10:59:43.186: E/AndroidRuntime(31318): at java.lang.reflect.Method.invokeNative(Native Method)
09-27 10:59:43.186: E/AndroidRuntime(31318): at java.lang.reflect.Method.invoke(Method.java:511)
09-27 10:59:43.186: E/AndroidRuntime(31318): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
09-27 10:59:43.186: E/AndroidRuntime(31318): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
09-27 10:59:43.186: E/AndroidRuntime(31318): at dalvik.system.NativeStart.main(Native Method)
09-27 10:59:43.186: E/AndroidRuntime(31318): Caused by: java.lang.NullPointerException
09-27 10:59:43.186: E/AndroidRuntime(31318): at org.example.touch.FormSpaj.onActivityResult(FormSpaj.java:993)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.Activity.dispatchActivityResult(Activity.java:5347)
09-27 10:59:43.186: E/AndroidRuntime(31318): at android.app.ActivityThread.deliverResults(ActivityThread.java:3175)
09-27 10:59:43.186: E/AndroidRuntime(31318): ... 11 more
我真的希望有人可以帮助我解决我的问题，我已经堆叠了，无论如何也无法思考，请有人帮助我......谢谢。
答案 0 :(得分：21)
确保您同时拥有相机权限和读取/写入外部存储空间权限。
试试这个就像魅力一样
private String selectedImagePath = "";
final private int PICK_IMAGE = 1;
final private int CAPTURE_IMAGE = 2;
public Uri setImageUri() {
// Store image in dcim
File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png");
Uri imgUri = Uri.fromFile(file);
this.imgPath = file.getAbsolutePath();
return imgUri;
}
public String getImagePath() {
return imgPath;
}
btnGallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE);
}
});
btnCapture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
startActivityForResult(intent, CAPTURE_IMAGE);
}
});
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != Activity.RESULT_CANCELED) {
if (requestCode == PICK_IMAGE) {
selectedImagePath = getAbsolutePath(data.getData());
imgUser.setImageBitmap(decodeFile(selectedImagePath));
} else if (requestCode == CAPTURE_IMAGE) {
selectedImagePath = getImagePath();
imgUser.setImageBitmap(decodeFile(selectedImagePath));
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
}
public Bitmap decodeFile(String path) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 70;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeFile(path, o2);
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}
public String getAbsolutePath(Uri uri) {
String[] projection = { MediaColumns.DATA };
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(uri, projection, null, null, null);
if (cursor != null) {
int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} else
return null;
}
答案 1 :(得分：7)
试试这个，昨天我遇到了同样的问题。使用下面的代码我纠正问题。试试吧。
注意：并为特定活动添加configChanges。同时调用相机意图活动将刷新。你需要避免这种情况。 android:configChanges="orientation|keyboardHidden|screenSize"
btnGallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 1);
}
});
btnCapture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(Environment
.getExternalStorageDirectory(),
"test.jpg");
outputFileUri = Uri.fromFile(file);
Log.d("TAG", "outputFileUri intent"
+ outputFileUri);
intent.putExtra(MediaStore.EXTRA_OUTPUT,
outputFileUri);
startActivityForResult(intent, 0);
}
});
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case 0:
if (resultCode == RESULT_OK) {
Log.d("TAG", "outputFileUri RESULT_OK" + outputFileUri);
if (outputFileUri != null) {
Bitmap bitmap;
bitmap = decodeSampledBitmapFromUri(outputFileUri,
image.getWidth(), image.getHeight());
if (bitmap == null) {
Toast.makeText(getApplicationContext(),
"the image data could not be decoded",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(
getApplicationContext(),
"Decoded Bitmap: " + bitmap.getWidth() + " x "
+ bitmap.getHeight(), Toast.LENGTH_LONG)
.show();
image.setImageBitmap(bitmap);
}
}
}
break;
case 1:
if (resultCode == RESULT_OK) {
Uri targetUri = data.getData();
Log.d("TAG", "datae" + targetUri);
Bitmap bitmap;
bitmap = decodeSampledBitmapFromUri(targetUri,
image.getWidth(), image.getHeight());
if (bitmap == null) {
Toast.makeText(getApplicationContext(),
"the image data could not be decoded",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(
getApplicationContext(),
"Decoded Bitmap: " + bitmap.getWidth() + " x "
+ bitmap.getHeight(), Toast.LENGTH_LONG)
.show();
image.setImageBitmap(bitmap);
}
}
break;
default:
break;
}
}
public Bitmap decodeSampledBitmapFromUri(Uri uri, int reqWidth,
int reqHeight) {
Bitmap bm = null;
try {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(getContentResolver()
.openInputStream(uri), null, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeStream(getContentResolver()
.openInputStream(uri), null, options);
} catch (FileNotFoundException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), e.toString(),
Toast.LENGTH_LONG).show();
}
return bm;
}
public int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float) height / (float) reqHeight);
} else {
inSampleSize = Math.round((float) width / (float) reqWidth);
}
}
return inSampleSize;
}
答案 2 :(得分：4)
更干净的代码，可能会帮助某人寻找答案，基本上当您将文件保存到外部存储包时，结果中不再有位图，而是必须从文件加载
String fileName;
.
.
private void takePicture() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
loadImageFromFile();
}
}
public void loadImageFromFile(){
ImageView view = (ImageView)this.findViewById(R.id.imageViewHeader);
view.setVisibility(View.VISIBLE);
int targetW = view.getWidth();
int targetH = view.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
view.setImageBitmap(bitmap);
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
fileName = image.getAbsolutePath();
return image;
}
答案 3 :(得分：3)
我认为以下行会导致问题。
Bitmap photo = (Bitmap) data.getExtras().get("data");
您已将文件uri传递给以下
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);
当您使用URI传递EXTRA_OUTPUT时，您在onActivityResult（）中收到的意图将为null。如果您想在此方法中获取图像，请使用EXTRA_OUTPUT传递的路径获取图像。