我试图寻找解决方案，但我仍然无法解决它并且我R.java无法生成R.id.picture. 我可以知道我哪里做错了吗？
/**
* PicSelectActivity presents image gallery - user can select new images to
* Display within scrolling thumbnail gallery - user can select individual image
* To display at larger size
*
* Sue Smith Mobiletuts+ Tutorial - Importing and Displaying Images with the
* Android Gallery June 2012
*/
public class FxPhoto extends Activity {
// variable for selection intent
private final int PICKER = 1;
// variable to store the currently selected image
private int currentPic = 0;
// adapter for gallery view
private PicAdapter imgAdapt;
// gallery object
private Gallery picGallery;
// image view for larger display
private ImageView picView;
/**
* instantiate the interactive gallery
*/
@Override
public void onCreate(Bundle savedInstanceState) {
/*
* When the user clicks a thumbnail in the gallery it is displayed at
* larger size
*
* When the user long-clicks a thumbnail they are taken to their chosen
* image selection activity, either the Android image gallery or a file
* manager application - on returning the chosen image is displayed
* within the thumbnail gallery and larger image view
*/
// call superclass method and set main content view
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// get the large image view
picView = (ImageView) findViewById(**R.id.picture**);
// get the gallery view
picGallery = (Gallery) findViewById(**R.id.gallery**);
// create a new adapter
imgAdapt = new PicAdapter(this);
// set the gallery adapter
picGallery.setAdapter(imgAdapt);
// set long click listener for each gallery thumbnail item
picGallery.setOnItemLongClickListener(new OnItemLongClickListener() {
// handle long clicks
public boolean onItemLongClick(AdapterView<?> parent, View v,
int position, long id) {
// update the currently selected position so that we assign the
// imported bitmap to correct item
currentPic = position;
// take the user to their chosen image selection app (gallery or
// file manager)
Intent pickIntent = new Intent();
pickIntent.setType("image/*");
pickIntent.setAction(Intent.ACTION_GET_CONTENT);
// we will handle the returned data in onActivityResult
startActivityForResult(
Intent.createChooser(pickIntent, "Select Picture"),
PICKER);
return true;
}
});
// set the click listener for each item in the thumbnail gallery
picGallery.setOnItemClickListener(new OnItemClickListener() {
// handle clicks
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// set the larger image view to display the chosen bitmap
// calling method of adapter class
picView.setImageBitmap(imgAdapt.getPic(position));
}
});
}
/**
* Base Adapter subclass creates Gallery view - provides method for adding
* new images from user selection - provides method to return bitmaps from
* array
*
*/
public class PicAdapter extends BaseAdapter {
// use the default gallery background image
int defaultItemBackground;
// gallery context
private Context galleryContext;
// array to store bitmaps to display
private Bitmap[] imageBitmaps;
// placeholder bitmap for empty spaces in gallery
Bitmap placeholder;
// constructor
public PicAdapter(Context c) {
// instantiate context
galleryContext = c;
// create bitmap array
imageBitmaps = new Bitmap[10];
// decode the placeholder image
placeholder = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
// set placeholder as all thumbnail images in the gallery initially
for (int i = 0; i < imageBitmaps.length; i++)
imageBitmaps[i] = placeholder;
// get the styling attributes - use default Andorid system resources
TypedArray styleAttrs = galleryContext
.obtainStyledAttributes(R.**styleable**.PicGallery);
// get the background resource
defaultItemBackground = styleAttrs.getResourceId(
R.**styleable**.PicGallery_android_galleryItemBackground, 0);
// recycle attributes
styleAttrs.recycle();
}
// BaseAdapter methods
// return number of data items i.e. bitmap images
public int getCount() {
return imageBitmaps.length;
}
// return item at specified position
public Object getItem(int position) {
return position;
}
// return item ID at specified position
public long getItemId(int position) {
return position;
}
// get view specifies layout and display options for each thumbnail in
// the gallery
public View getView(int position, View convertView, ViewGroup parent) {
// create the view
ImageView imageView = new ImageView(galleryContext);
// specify the bitmap at this position in the array
imageView.setImageBitmap(imageBitmaps[position]);
// set layout options
imageView.setLayoutParams(new Gallery.LayoutParams(300, 200));
// scale type within view area
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
// set default gallery item background
imageView.setBackgroundResource(defaultItemBackground);
// return the view
return imageView;
}
// custom methods for this app
// helper method to add a bitmap to the gallery when the user chooses
// one
public void addPic(Bitmap newPic) {
// set at currently selected index
imageBitmaps[currentPic] = newPic;
}
// return bitmap at specified position for larger display
public Bitmap getPic(int posn) {
// return bitmap at posn index
return imageBitmaps[posn];
}
}
/**
* Handle returning from gallery or file manager image selection - import
* the image bitmap
*/
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
// check if we are returning from picture selection
if (requestCode == PICKER) {
// the returned picture URI
Uri pickedUri = data.getData();
// declare the bitmap
Bitmap pic = null;
// declare the path string
String imgPath = "";
// retrieve the string using media data
String[] medData = { MediaStore.Images.Media.DATA };
// query the data
Cursor picCursor = managedQuery(pickedUri, medData, null, null,
null);
if (picCursor != null) {
// get the path string
int index = picCursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
picCursor.moveToFirst();
imgPath = picCursor.getString(index);
} else
imgPath = pickedUri.getPath();
// if and else handle both choosing from gallery and from file
// manager
// if we have a new URI attempt to decode the image bitmap
if (pickedUri != null) {
// set the width and height we want to use as maximum
// display
int targetWidth = 600;
int targetHeight = 400;
// sample the incoming image to save on memory resources
// create bitmap options to calculate and use sample size
BitmapFactory.Options bmpOptions = new BitmapFactory.Options();
// first decode image dimensions only - not the image bitmap
// itself
bmpOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(imgPath, bmpOptions);
// work out what the sample size should be
// image width and height before sampling
int currHeight = bmpOptions.outHeight;
int currWidth = bmpOptions.outWidth;
// variable to store new sample size
int sampleSize = 1;
// calculate the sample size if the existing size is larger
// than target size
if (currHeight > targetHeight || currWidth > targetWidth) {
// use either width or height
if (currWidth > currHeight)
sampleSize = Math.round((float) currHeight
/ (float) targetHeight);
else
sampleSize = Math.round((float) currWidth
/ (float) targetWidth);
}
// use the new sample size
bmpOptions.inSampleSize = sampleSize;
// now decode the bitmap using sample options
bmpOptions.inJustDecodeBounds = false;
// get the file as a bitmap
pic = BitmapFactory.decodeFile(imgPath, bmpOptions);
// pass bitmap to ImageAdapter to add to array
imgAdapt.addPic(pic);
// redraw the gallery thumbnails to reflect the new addition
picGallery.setAdapter(imgAdapt);
// display the newly selected image at larger size
picView.setImageBitmap(pic);
// scale options
picView.setScaleType(ImageView.ScaleType.FIT_CENTER);
}
}
}
// superclass method
super.onActivityResult(requestCode, resultCode, data);
}
}