Android GridView将保持高亮显示所选项目
我的布局有一个网格视图。与谷歌的API演示类似,每个网格都有一个图像。此外,我还定制了一个“可绘制图像”,用于突出显示当前选定的项目。触摸网格图像时,可显示“可绘制图像”。不幸的是,当我不接触网格时,它将消失 我希望GridView将继续突出显示所选项目。甚至用户也在滚动屏幕 从这里,我找到了一些类似的帖子 (一) (二) 但我不能理解他们的方法,他们没有使用自定义图像。 谁能给我一些帮助吗?求你了 以下是我的代码:Android GridView将保持高亮显示所选项目,android,gridview,Android,Gridview,我的布局有一个网格视图。与谷歌的API演示类似,每个网格都有一个图像。此外,我还定制了一个“可绘制图像”,用于突出显示当前选定的项目。触摸网格图像时,可显示“可绘制图像”。不幸的是,当我不接触网格时,它将消失 我希望GridView将继续突出显示所选项目。甚至用户也在滚动屏幕 从这里,我找到了一些类似的帖子 (一) (二) 但我不能理解他们的方法,他们没有使用自定义图像。 谁能给我一些帮助吗?求你了 以下是我的代码: gridAdapter adapter = new gridA
gridAdapter adapter = new gridAdapter (this, images);
gv = (GridView) findViewById (R.id.gridView1);
gv.setAdapter(adapter);
gv.setSelector(R.drawable.circle);
gv.setDrawSelectorOnTop(true);
以下是我的更新代码:
public class GridViewBasic extends Activity {
Integer[] imageIDs = {
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher };
GridView gridView;
public int lastPos;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gridView = (GridView) findViewById(R.id.gridView1);
gridView.setAdapter(new ImageAdapter(this));
gridView.setSelected(true);
gridView.setSelector(R.drawable.circle);
gridView.setDrawSelectorOnTop(true);
gridView.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
gridView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
lastPos = position;
gridView.setSelection((int)(gridView.getAdapter()).getItemId(lastPos));
System.out.println ("getItemId ="+(gridView.getAdapter()).getItemId(lastPos));
}
});
}
public class ImageAdapter extends BaseAdapter
{
private Context context;
public ImageAdapter(Context c) {
context = c;
}
//---returns the number of images---
public int getCount() {
return imageIDs.length;
}
//---returns the ID of an item---
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
//---returns an ImageView view---
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(185, 185));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(imageIDs[position]);
return imageView;
}
}
}
公共类GridViewBasic扩展活动{
整数[]图像ID={
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_launcher};
GridView;
公共邮政局;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gridView=(gridView)findViewById(R.id.gridView1);
setAdapter(新的ImageAdapter(this));
gridView.setSelected(true);
gridView.setSelector(R.可绘制圆);
setDrawSelectorOnTop(true);
gridView.SetDegenantFocusability(ViewGroup.FOCUS在子体之后);
setOnItemClickListener(新的OnItemClickListener(){
public void onItemClick(AdapterView父视图、视图v、整型位置、长id){
lastPos=位置;
gridView.setSelection((int)(gridView.getAdapter()).getItemId(lastPos));
System.out.println(“getItemId=“+(gridView.getAdapter()).getItemId(lastPos));
}
});
}
公共类ImageAdapter扩展了BaseAdapter
{
私人语境;
公共图像适配器(上下文c){
上下文=c;
}
//---返回图像的数量---
public int getCount(){
返回imageid.length;
}
//---返回项目的ID--
公共对象getItem(int位置){
返回位置;
}
公共长getItemId(int位置){
返回位置;
}
//---返回ImageView视图---
公共视图getView(int位置、视图转换视图、视图组父视图){
图像视图图像视图;
if(convertView==null){
imageView=新的imageView(上下文);
setLayoutParams(新的GridView.LayoutParams(185185));
imageView.setScaleType(imageView.ScaleType.CENTER\U裁剪);
设置填充(5,5,5,5);
}否则{
imageView=(imageView)convertView;
}
setImageResource(ImageId[position]);
返回图像视图;
}
}
}
好了,现在需要一个全新的答案
事情是这样的:setSelected()
将把调用视图设置为选中,从而随后给出焦点
召唤
GridView gv; gv.setSelected(true);
将选择GridView gv,而不是所需的GridView适配器中的视图
因此,您需要调用gv.setSelection(pos)
来选择特定的子项
您正在保存的pos
可能不是实际位置,而是“可见”偏移的位置。这就是你必须打电话的原因
(gridView.getAdapter()).getPosition(viewThatYouWant);
或
请注意,您应该研究视图如何处理其焦点与子焦点
方法被调用
setDescendantFocusability
所以你自然会想要
GridView gv; gv.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
公共类StaffSelectionAdapter扩展BaseAdapter{
私人语境;
私有最终字符串[]staffMemberList;
private int previousPosition=-1;
私有静态布尔值是第一次;
布尔[]被检查;
私有TextView TextView=null;
公共长钉;
私人充气机;
公共StaffSelectionAdapter(上下文上下文,字符串[]staffMemberList){
this.context=上下文;
充气器=(LayoutFlater)context.getSystemService(context.LAYOUT\u充气器\u服务);
this.staffMemberList=staffMemberList;
isFirstTime=true;
isChecked=new boolean[staffMemberList.length];
for(int i=0;iGridView gv; gv.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
public class StaffSelectionAdapter extends BaseAdapter {
private Context context;
private final String[] staffMemberList;
private int previousPosition = -1;
private static boolean isFirstTime;
boolean[] isChecked;
private TextView textView = null;
public long staffId;
private LayoutInflater inflater;
public StaffSelectionAdapter(Context context, String[] staffMemberList) {
this.context = context;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.staffMemberList = staffMemberList;
isFirstTime = true;
isChecked = new boolean[staffMemberList.length];
for (int i = 0; i < staffMemberList.length; i++) {
isChecked[i] = false;
}
}
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.row_for_staff_selection, null);
}
textView = (TextView) convertView.findViewById(R.id.row_for_staff_selection_grid_item_label);
textView.setText(staffMemberList[position]);
if (isChecked[position]) {
SpannableString content = new SpannableString(staffMemberList[position]);
content.setSpan(new UnderlineSpan(), 0, staffMemberList[position].length(), 0);
textView.setText(content);
} else {
textView.setBackgroundColor(context.getResources().getColor(R.drawable.dialog_bg));
}
convertView.setTag(position);
convertView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (!isChecked[position]) {
staffId =
isChecked[position] = true;
if (!isFirstTime) {
isChecked[previousPosition] = false;
} else {
isFirstTime = false;
}
textView.setBackgroundColor(context.getResources().getColor(R.drawable.dialog_bg));
}
previousPosition = (Integer) v.getTag();
notifyDataSetChanged();
}
});
return convertView;
}
public int getCount()
{
return staffMemberList.length;
}
public Object getItem(int position)
{
return staffMemberList[position];
}
public long getItemId(int position) {
return 0;
}
public long getStaffId() {
return staffId;
}
public void setStaffId(long staffId) {
this.staffId = staffId;
}
}
public ColorGridAdapter(Context context,ArrayList<String> colorArray,int position) {
super(context, resource,colorArray);
this.context = context;
this.colors = colorArray;
this.selected_position = position; // position of your selected item
}
public View getView(final int position, View convertView, ViewGroup parent){
View v = convertView;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.color_pelatte, null);
ColorView = (View)v.findViewById(R.id.color_view);
}
ColorView.setBackgroundColor(Color.parseColor(colors.get(position)));
if(position == selected_position){
v.setBackground(context.getResources().getDrawable(R.drawable.edittext_background));
}
<GridView
android:id="@+id/gv_calender"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="7"
android:listSelector="@color/colorAccent"
android:stretchMode="columnWidth"></GridView>
GridView gvCalender = (GridView)findViewById(R.id.gv_calender);
CalendarAdapter adapter = new CalendarAdapter(getActivity(), lsCalender);
gvCalender.setDrawSelectorOnTop(false);
gvCalender.setAdapter(adapter);