我正在处理gridview，这是我要求在delete button按下一次从gridview删除多个所选图像项目。
表示我应该可以在删除按钮时删除所选图像。
我尝试了很多，但没有想到这个。
我可以一次删除一张图片。
这就是我所做的。
//活性
public class ImageActivity extends Activity {
ImageAdapter iAdapter;
ArrayList<Integer>myList;
int position;
GridView gView;
boolean selected = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image);
dataImage();
iAdapter = new ImageAdapter(this,myList);
gView = (GridView)findViewById(R.id.grid_view);
gView.setAdapter(iAdapter);
gView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
gView.setSelection(position);
gView.setSelected(true);
Toast.makeText(ImageActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_image, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.menu_delete)
{
if(gView.isSelected())
{
iAdapter.list.remove(iAdapter.getPosition());
iAdapter.notifyDataSetChanged();
Toast.makeText(this, "Delete" ,Toast.LENGTH_SHORT ).show();
}
}
gView.setSelected(false);
return super.onOptionsItemSelected(item);
}
public void dataImage()
{
myList = new ArrayList<Integer>();
myList.add(R.drawable.sample_1);
myList.add(R.drawable.sample_3);
myList.add(R.drawable.sample_2);
myList.add(R.drawable.sample_2);
myList.add(R.drawable.sample_1);
myList.add(R.drawable.sample_3);
myList.add(R.drawable.sample_1);
myList.add(R.drawable.sample_3);
myList.add(R.drawable.sample_2);
}
}
//适配器
public class ImageAdapter extends BaseAdapter{
Context context;
ArrayList<Integer> list;
int position;
ImageView imageView;
ImageActivity act;
public ImageAdapter(Context context,ArrayList<Integer>list)
{
this.list = list;
this.context = context;
act = (ImageActivity)context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
this.position = position;
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(0, 5, 0, 0);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(list.get(position));
return imageView;
}
public int getPosition()
{
return position;
}
}
//
任何人都可以指导我或帮助我。
我的要求 ： -
如何一次性删除gridview中的多个图片按删除按钮。
答案 0 :(得分：1)
您好我在CheckBox
GridView删除多张图片
public class MainActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
ArrayList<String> f = new ArrayList<String>();// list of file paths
File[] listFile;
Button btnDelete;
private ProgressDialog pd;
HashSet<String> selectedFile = new HashSet<String>();// list of file paths boolean checked
GridView imagegrid;
AlertDialog alertDialog = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getFromSdcard();
imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);
imageAdapter.notifyDataSetChanged();
btnDelete = (Button) findViewById(R.id.btnDeleteImg);
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// to delete selected images
Iterator iterator = selectedFile.iterator();
while (iterator.hasNext()){
new File(iterator.next().toString()).delete();
}
}
});
}
public void getFromSdcard() {
File file = new File("/mnt/sdcard/Images");
if (file.isDirectory()) {
listFile = file.listFiles();
for (int i = 0; i < listFile.length; i++) {
f.add(listFile[i].getAbsolutePath());
}
}
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return f.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();
}
Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position));
holder.imageview.setImageBitmap(myBitmap);
final int pos = position;
holder.checkbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!selectedFile.contains((String)f.get(pos)))
{
selectedFile.add((String)f.get(pos));
}
else
{
selectedFile.remove((String)f.get(pos));
}
}
});
return convertView;
}
}
class ViewHolder {
ImageView imageview;
CheckBox checkbox;
int id;
}
}
这种方法对我有用，如果你们需要更多信息请发表评论，谢谢stackoverflow
答案 1 :(得分：0)
您可以使用自定义列表适配器，其中使用Check Box和ImageView（自定义视图）并在getView（）中膨胀视图。在复选框中选择将其放入ArrayList并放入删除按钮，您可以通过该按钮删除列表中的所有图像，而不是通知适配器。