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我有一个网格视图，图像和关联复选框显示在片段中。片段类包括从图库或相机捕获图像的方法。我如何引入一个回调从Adapter到Fragment类，并且已经点击了项目引用，以便捕获/加载图像可以从Fragment类中执行？如何将回调从适配器返回到片段类
片段类其中网格必须被加载来自照相机或画廊图像捕获：
public class SellMainFrag extends Fragment{
private int REQUEST_CAMERA = 0, SELECT_FILE = 1;
private Button btnSelect;
private ImageView ivImage;
private String userChoosenTask;
public SellMainFrag() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sell_main, container, false);
int iconSize=getResources().getDimensionPixelSize(android.R.dimen.app_icon_size);
ImageGridAdapter adapter = new ImageGridAdapter(view.getContext(), iconSize);
GridView gridview = (GridView) view.findViewById(R.id.gridView1);
gridview.setAdapter(adapter);
return view;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case Utility.MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if(userChoosenTask.equals("Take Photo"))
cameraIntent();
else if(userChoosenTask.equals("Choose from Library"))
galleryIntent();
} else {
//code for deny
}
break;
}
}
private void selectImage() {
final CharSequence[] items = { "Take Photo", "Choose from Library", "Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setTitle("Add Photo!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
boolean result=Utility.checkPermission(getContext());
if (items[item].equals("Take Photo")) {
userChoosenTask ="Take Photo";
if(result)
cameraIntent();
} else if (items[item].equals("Choose from Library")) {
userChoosenTask ="Choose from Library";
if(result)
galleryIntent();
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
private void galleryIntent()
{
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);//
startActivityForResult(Intent.createChooser(intent, "Select File"),SELECT_FILE);
}
private void cameraIntent()
{
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_CAMERA);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_FILE)
onSelectFromGalleryResult(data);
else if (requestCode == REQUEST_CAMERA)
onCaptureImageResult(data);
}
}
private void onCaptureImageResult(Intent data) {
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
File destination = new File(Environment.getExternalStorageDirectory(),
System.currentTimeMillis() + ".jpg");
FileOutputStream fo;
try {
destination.createNewFile();
fo = new FileOutputStream(destination);
fo.write(bytes.toByteArray());
fo.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
ivImage.setImageBitmap(thumbnail);
}
@SuppressWarnings("deprecation")
private void onSelectFromGalleryResult(Intent data) {
Bitmap bm=null;
if (data != null) {
try {
bm = MediaStore.Images.Media.getBitmap(getContext().getContentResolver(), data.getData());
} catch (IOException e) {
e.printStackTrace();
}
}
ivImage.setImageBitmap(bm);
}
}
适配器类，其包括侦听来捕获点击：
public class ImageGridAdapter extends BaseAdapter{
private Context mContext;
private int mIconSize;
private static LayoutInflater inflater=null;
private String[] web = {
"Doctors","Movies","Dentists","Restaurants","Car"} ;
private int[] imageId = {
R.mipmap.doctors,
R.mipmap.dentists,
R.mipmap.restaurants,
R.mipmap.carmechanic,
R.mipmap.ic_launcher
};
public ImageGridAdapter(Context mContext, int mIconSize) {
super();
this.mContext = mContext;
this.mIconSize = mIconSize;
inflater = (LayoutInflater)mContext.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return imageId.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public class Holder
{
CheckBox ck;
ImageView img;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder=new Holder();
View rowView;
rowView = inflater.inflate(R.layout.sell_main_images, null);
holder.ck=(CheckBox) rowView.findViewById(R.id.chk1);
holder.img=(ImageView) rowView.findViewById(R.id.imageView1);
holder.ck.isChecked();
holder.img.setImageResource(imageId[position]);
rowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// How do I introduce a callback to Fragment class with the item reference that has been clicked so that capture/loading images can be performed from the Fragment class?
}
});
return rowView;
}
}
尝试使用接口..按照给定的链接了解更多信息[http://stackoverflow.com/questions/15444375/how-to-create-interface-between-fragment-and-adapter] –