我的应用程序设置为仅以纵向模式显示。问题是，我需要使用相机和图库，而你不能将这些应用程序指定为相同的方向，所以在这些方向更改之间会发生一些奇怪的事情，这会使我的图像数据为空。
当手机没有侧向倾斜（在纵向模式下）时，此代码运行良好。在方向改变后，我该如何改进它来处理数据？
public class PostPhotosActivity extends Activity {
public static final String TAG = "PostPhotosActivity";
String title, price, description, maincat, subcat, pname, pemail, pphone, pmeet, imageUri;
public static final String TEMP_PHOTO_FILE_NAME = "temp_photo.jpg";
public static final int REQUEST_CODE_GALLERY = 0x1;
public static final int REQUEST_CODE_TAKE_PICTURE = 0x2;
public static final int REQUEST_CODE_CROP_IMAGE = 0x3;
private ImageView mImageView;
private File mFileTemp;
ParseFile file;
double latitude, longitude;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); //To change body of overridden methods use File | Settings | File Templates.
setContentView(R.layout.activity_post_photos);
Bundle extras= getIntent().getExtras();
if(extras!=null)
{
title = extras.getString("TITLE"); // get the value based on the key
price = extras.getString("PRICE"); // get the value based on the key
description = extras.getString("DESCRIPTION"); // get the value based on the key
maincat = extras.getString("MAINCAT"); // get the value based on the key
subcat = extras.getString("SUBCAT"); // get the value based on the key
pname = extras.getString("PNAME"); // get the value based on the key
pemail = extras.getString("PEMAIL"); // get the value based on the key
pphone = extras.getString("PPHONE"); // get the value based on the key
pmeet = extras.getString("PMEET"); // get the value based on the key
}
button = (Button) findViewById(R.id.post_data);
button.setVisibility(View.INVISIBLE);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
GpsLocationTracker mGpsLocationTracker = new GpsLocationTracker(PostPhotosActivity.this);
/**
* Set GPS Location fetched address
*/
if (mGpsLocationTracker.canGetLocation())
{
latitude = mGpsLocationTracker.getLatitude();
longitude = mGpsLocationTracker.getLongitude();
Log.i(TAG, String.format("latitude: %s", latitude));
Log.i(TAG, String.format("longitude: %s", longitude));
}
else
{
mGpsLocationTracker.showSettingsAlert();
}
ParseGeoPoint point = new ParseGeoPoint(latitude, longitude);
ParseObject setPost = new ParseObject("testData");
// Create an author relationship with the current user
setPost.put("author", ParseUser.getCurrentUser());
// Get location
setPost.put("location", point);
setPost.put("Title", title);
setPost.put("Price", price);
setPost.put("Description", description);
setPost.put("MainCat", maincat);
setPost.put("SubCat", subcat);
setPost.put("PName", pname);
setPost.put("PEmail", pemail);
setPost.put("PPhone", pphone);
setPost.put("PMeet", pmeet);
setPost.put("Photo", file);
setPost.saveInBackground();
Intent intent = new Intent(PostPhotosActivity.this, Flow.class);
startActivity(intent);
}
});
final String[] items = new String[] { "Take from camera",
"Select from gallery" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.select_dialog_item, items);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Select Image");
builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) { // pick from
// camera
if (item == 0) {
takePicture();
} else { // pick from file
openGallery();
}
}
});
final AlertDialog dialog = builder.create();
mImageView = (ImageView) findViewById(R.id.iv_photo);
mImageView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
dialog.show();
}
});
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mFileTemp = new File(Environment.getExternalStorageDirectory(), TEMP_PHOTO_FILE_NAME);
}
else {
mFileTemp = new File(getFilesDir(), TEMP_PHOTO_FILE_NAME);
}
}
private void takePicture() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
Uri mImageCaptureUri = null;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mImageCaptureUri = Uri.fromFile(mFileTemp);
}
else {
/*
* The solution is taken from here: http://stackoverflow.com/questions/10042695/how-to-get-camera-result-as-a-uri-in-data-folder
*/
mImageCaptureUri = InternalStorageContentProvider.CONTENT_URI;
}
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
intent.putExtra("return-data", true);
startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE);
} catch (ActivityNotFoundException e) {
Log.d(TAG, "cannot take picture", e);
}
}
private void openGallery() {
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, REQUEST_CODE_GALLERY);
}
private void startCropImage() {
Intent intent = new Intent(this, CropImage.class);
intent.putExtra(CropImage.IMAGE_PATH, mFileTemp.getPath());
intent.putExtra(CropImage.SCALE, true);
intent.putExtra(CropImage.ASPECT_X, 1);
intent.putExtra(CropImage.ASPECT_Y, 1);
startActivityForResult(intent, REQUEST_CODE_CROP_IMAGE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_OK) {
return;
}
Bitmap bitmap;
switch (requestCode) {
case REQUEST_CODE_GALLERY:
try {
InputStream inputStream = getContentResolver().openInputStream(data.getData());
FileOutputStream fileOutputStream = new FileOutputStream(mFileTemp);
copyStream(inputStream, fileOutputStream);
fileOutputStream.close();
inputStream.close();
startCropImage();
} catch (Exception e) {
Log.e(TAG, "Error while creating temp file", e);
}
break;
case REQUEST_CODE_TAKE_PICTURE:
startCropImage();
break;
case REQUEST_CODE_CROP_IMAGE:
String path = data.getStringExtra(CropImage.IMAGE_PATH);
if (path == null) {
return;
}
//byte[] idata = path.getBytes();
Bitmap picture = BitmapFactory.decodeFile(path);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
picture.compress(Bitmap.CompressFormat.JPEG, 100, stream);
// get byte array here
byte[] idata= stream.toByteArray();
file = new ParseFile("photo.jpg", idata);
file.saveInBackground();
bitmap = BitmapFactory.decodeFile(mFileTemp.getPath());
mImageView.setImageBitmap(bitmap);
button.setVisibility(View.VISIBLE);
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
public static void copyStream(InputStream input, OutputStream output)
throws IOException {
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buffer)) != -1) {
output.write(buffer, 0, bytesRead);
}
}
]
您可以使用片段来保留因方向更改而丢失的信息。
http://www.vogella.com/articles/AndroidFragments/article.html#headlessfragments2