我通过应用程序相机按钮捕获图像，从特定文件夹中的片段中设置图像适配器。但是在捕获图像后它不会刷新图像适配器。
这是我的代码：
public class FragmentTab1 extends Fragment {
public ImageAdapter imageAdapter;
private final static int TAKE_IMAGE = 1;
private final static int UPLOAD_IMAGES = 2;
private final static int VIEW_IMAGE = 3;
private Uri imageUri;
private MediaScannerConnection mScanner;
public GridView imagegrid;
private long lastId;
android.hardware.Camera.Parameters parameters;
android.hardware.Camera.Size size;
public Context ctx;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab1, container, false);
ctx=getActivity();
imageAdapter = new ImageAdapter(ctx);
imageAdapter.initialize();
imagegrid = (GridView) rootView.findViewById(R.id.PhoneImageGrid);
final Button PhotoBtn = (Button) rootView.findViewById(R.id.PhotoBtn);
PhotoBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
String fileName = "IMG_" + sdf.format(new Date()) + ".jpg";
File myDirectory = new File(Environment
.getExternalStorageDirectory() + "/PHOTOAPP/");
myDirectory.mkdirs();
File file = new File(myDirectory, fileName);
imageUri = Uri.fromFile(file);
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
//parameters=Camera.
//intent.putExtra(MediaStore.EXTRA_SIZE_LIMIT,153600L);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_IMAGE);
}
});
imagegrid.setAdapter(imageAdapter);
return rootView;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case TAKE_IMAGE:
try {
if (resultCode ==Activity. RESULT_OK) {
// we need to update the gallery by starting MediaSanner service.
mScanner = new MediaScannerConnection(
getActivity(),
new MediaScannerConnection.MediaScannerConnectionClient() {
public void onMediaScannerConnected() {
mScanner.scanFile(imageUri.getPath(), null /* mimeType */);
}
public void onScanCompleted(String path, Uri uri) {
if (path.equals(imageUri.getPath())) {
mScanner.disconnect();
//we need to create new UI thread because, we can't update our mail thread from here
//Both the thread will run one by one, see documentation of android
getActivity()
.runOnUiThread(new Runnable() {
public void run() {
updateUI();
}
});
}
}
});
mScanner.connect();
}
} catch (Exception e) {
e.printStackTrace();
}
break;
case UPLOAD_IMAGES:
if (resultCode == Activity.RESULT_OK){
//do some code where you integrate this project
}
break;
}
}
public void updateUI() {
ctx=getActivity().getParent();
imageAdapter = new ImageAdapter(ctx);
//imageAdapter.initialize();
imageAdapter.checkForNewImages();
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ArrayList<ImageItem> images = new ArrayList<ImageItem>();
public ImageAdapter(Context c) {
ctx=c;
mInflater = (LayoutInflater)getActivity(). getSystemService(getActivity().LAYOUT_INFLATER_SERVICE);
}
@SuppressWarnings("deprecation")
public void initialize() {
images.clear();
final String[] columns = { MediaStore.Images.Thumbnails._ID };
final String orderBy = MediaStore.Images.Media._ID;
ContentResolver Resolver = getActivity().getContentResolver();
Cursor imagecursor = Resolver.query( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
columns,MediaStore.Images.Media.DATA + " like ? ",
new String[] {"%PHOTOAPP%"},orderBy);
if(imagecursor != null){
int image_column_index = imagecursor
.getColumnIndex(MediaStore.Images.Media._ID);
int count = imagecursor.getCount();
for (int i = 0; i < count; i++) {
imagecursor.moveToPosition(i);
int id = imagecursor.getInt(image_column_index);
ImageItem imageItem = new ImageItem();
imageItem.id = id;
lastId = id;
imageItem.img = MediaStore.Images.Thumbnails.getThumbnail(
getActivity().getContentResolver(), id,
MediaStore.Images.Thumbnails.MINI_KIND, null);
images.add(imageItem);
}
//imagecursor.close();
}
notifyDataSetChanged();
}
@SuppressWarnings("deprecation")
public void checkForNewImages(){
//Here we'll only check for newer images
final String[] columns = { MediaStore.Images.Thumbnails._ID };
final String orderBy = MediaStore.Images.Media._ID;
Cursor imagecursor=null;
ContentResolver Resolver = getActivity().getContentResolver();
System.out.println("SIZE="+images.size());
if(images.size()==0){
imagecursor = Resolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
columns,MediaStore.Images.Media.DATA + " like ? ",
new String[] {"%PHOTOAPP%"},orderBy);
}
else{
imagecursor = Resolver.query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns,
MediaStore.Images.Media._ID + " > " + lastId , null, orderBy);
}
int image_column_index = imagecursor
.getColumnIndex(MediaStore.Images.Media._ID);
int count = imagecursor.getCount();
for (int i = 0; i < count; i++) {
imagecursor.moveToPosition(i);
int id = imagecursor.getInt(image_column_index);
ImageItem imageItem = new ImageItem();
imageItem.id = id;
lastId = id;
imageItem.img = MediaStore.Images.Thumbnails.getThumbnail(
getActivity().getContentResolver(), id,
MediaStore.Images.Thumbnails.MINI_KIND, null);
imageItem.selection = true; //newly added item will be selected by default
images.add(imageItem);
}
//imagecursor.close();
notifyDataSetChanged();
}
public int getCount() {
return images.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.galleryitem, null);
holder.imageview = (ImageView) convertView
.findViewById(R.id.thumbImage);
holder.checkbox = (CheckBox) convertView
.findViewById(R.id.itemCheckBox);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
ImageItem item = images.get(position);
holder.checkbox.setId(position);
holder.imageview.setId(position);
holder.checkbox.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
CheckBox cb = (CheckBox) v;
int id = cb.getId();
if (images.get(id).selection) {
cb.setChecked(false);
images.get(id).selection = false;
} else {
cb.setChecked(true);
images.get(id).selection = true;
}
}
});
holder.imageview.setImageBitmap(item.img);
holder.checkbox.setChecked(item.selection);
holder.checkbox.setVisibility(View.GONE);
return convertView;
}
}
class ViewHolder {
ImageView imageview;
CheckBox checkbox;
}
class ImageItem {
boolean selection;
int id;
Bitmap img;
}
}
答案 0 :(得分：0)
问题出在这里，
public void updateUI() {
ctx=getActivity().getParent();
imageAdapter = new ImageAdapter(ctx);
//imageAdapter.initialize();
imageAdapter.checkForNewImages();
}
您无需为ImageAdapter创建新实例。所以你的updateUI()就像这样，
public void updateUI() {
imageAdapter.checkForNewImages();
}
但是你仍然会在网格中重复最后捕获的图像。
为避免这种情况，您需要先清除ArrayList，然后再添加新项目。
您可以简单地使用initialize()方法或
在images.clear()方法中执行checkForNewImages()。
如果您在此处使用checkForNewImages()方法，则无需notifyDataSetchanged()方法调用initialize()。
无论如何最终要求将变得相同，您需要在添加最后捕获的项目之前清除列表。因此，在我看来，您根本不需要checkFornewImages()方法，您可以使用initialize()方法进行notifyDataSetChanged()调用。
最后我的解决方法是，移除您的checkForNewImages()方法并修改您的updateUI()方法，如下所示，
public void updateUI() {
imageAdapter.initialize();
}
注意：删除checkForNewImages()无法解决您的问题。这只是拥有 DRY 代码。