问题
I want to draw selector on long press as shown in the picture. When I do long press on one item, the CAB menu is activated. But the list selector indicator goes off once after clicking. I want that list selectors to be active till the CAB menu is active for allowing multiple selection. And the color should toggle if I do double tap. This code works as a flicker when I click on it. Any one faced similar thing? Is there a hack to bring this functionality?
Gridview with multiple selection:
GridView setchoice in my OnCreate:
gridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);
gridView.setMultiChoiceModeListener(new MultiChoiceModeListener());
This is working fine:
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
ImageView iv = (ImageView) v
.findViewById(R.id.imageview2);
ViewGroup gridChild = (ViewGroup) gridView
.getChildAt(position);
ViewGroup gridGrandChild = (ViewGroup) gridChild
.getChildAt(0);
ViewGroup gridGreatGrandChild = (ViewGroup) gridGrandChild
.getChildAt(0);
int childSize = gridGreatGrandChild.getChildCount();
if (iv.getId() == gridGreatGrandChild.getChildAt(1)
.getId()) {
if (iv.getVisibility() == 4)
iv.setVisibility(View.VISIBLE);
else
iv.setVisibility(View.INVISIBLE);
}
}});
I am trying to implement the same code inside the MultiChoiceModeListener() class after the CAB menu is activated. Copied the same code inside
public void onItemCheckedStateChanged(ActionMode mode, int position,
long id, boolean checked) {
}
method. But I am unable to access the elements inside the viewgroup. But I am able to access the GridView in whole. But not the individual child inside the Grid.
Here is my gridview layout:
<GridView
android:id="@+id/grid_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:columnWidth="190dp"
android:drawSelectorOnTop="true"
android:choiceMode="multipleChoice"
android:horizontalSpacing="3dp"
android:listSelector="@drawable/list_selector"
android:numColumns="auto_fit"
android:paddingRight="4dp"
android:stretchMode="spacingWidthUniform"
android:verticalSpacing="3dp" >
</GridView>
Each item in the GridView is constructed with this layout:
<FrameLayout
android:id="@+id/frameLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RelativeLayout
android:id="@+id/relativelayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="@+id/imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ImageView>
<ImageView
android:id="@+id/imageview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageview"
android:layout_alignLeft="@+id/imageview"
android:layout_alignRight="@+id/imageview"
android:layout_alignTop="@+id/imageview"
android:visibility="invisible"
android:background="#76f9a49c"
>
</ImageView>
</RelativeLayout>
<ImageView
android:id="@+id/tagimage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|right"
android:layout_marginRight="-4dp"
android:src="@drawable/tag"
android:visibility="invisible" />
<ImageView
android:id="@+id/countimage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_marginBottom="8dp"
android:layout_marginRight="5dp"
android:src="@drawable/dealcount_overlay"
android:visibility="invisible" />
<TextView
android:id="@+id/count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_marginBottom="11dp"
android:layout_marginRight="24dp"
android:text="100"
android:textColor="#fff"
android:visibility="invisible" >
</TextView>
<ProgressBar
android:id="@+id/progressbar"
style="@android:style/Widget.ProgressBar.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:visibility="visible" />
</FrameLayout>
<TextView
android:id="@+id/textView_nodata"
android:layout_width="wrap_content"
android:layout_height="150dp"
android:layout_below="@+id/frameLayout1"
android:layout_centerHorizontal="true"
android:text="No data available. Try different query!"
android:textAppearance="?android:attr/textAppearanceLarge"
android:visibility="gone" />
</RelativeLayout>
Here is my list_selector.xml:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/gridviewlistselector" android:state_focused="true" android:state_pressed="false"/>
<item android:state_focused="true"><shape>
<solid android:color="#66000000" />
</shape></item>
<item android:state_selected="true"><shape>
<solid android:color="#66000000" />
</shape></item>
<item android:state_pressed="true"><shape>
<solid android:color="#66000000" />
</shape></item>
<item android:state_enabled="false" android:state_focused="true"><shape>
<solid android:color="#66000000" />
</shape></item>
</selector>
How can I achieve the functionality? I am getting stuck at this. I tried various combinations on Selectors. But nothing seems to be working for me. Do I need to provide any other detail?
回答1:
I'm not sure it's the right solution, but I set this for the android:background on my list items:
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:exitFadeDuration="@android:integer/config_mediumAnimTime" >
<!-- I never see this one - the grid items are not focusable -->
<item android:state_pressed="false" android:state_focused="true" android:drawable="@drawable/list_focused" />
<!-- while pressed -->
<item android:state_pressed="true" android:drawable="@drawable/pressed_background" />
<!-- while selected in actionmode -->
<item android:state_activated="true" android:drawable="@color/pressed" />
<item android:drawable="@android:color/transparent" />
</selector>
I did not set the android:listSelector attribute on the grid view.
回答2:
Give padding in your grid item. Maintain bean class for each object in grid adapter to track object is selected or unselected. Based on this value you can update your grid item background color acc to state selected/unselected. Update the object value in onitemclieck listner and also view background.
回答3:
this can be achieved by tracking the selected items and changing their backgrounds inside the adapter.
I guess you will get little help from this post
回答4:
I m suggested to implement custom drawables as per your requirement.In long press listener ,you can apply it whatever state you are being required. This is one of the way to write code from our own scratch.
https://github.com/rameshkec85/Example-Android-CustomDrawableStates
回答5:
For this you need to change Grid View Item, BackgroundColor on single/long click.
Below is the reference code, for the same:
GridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
mAdapter.setSelected(position,true);
view.setBackgroundColor(Color.XYZ);
}
}
Hope this help's. Thanks.
来源：https://stackoverflow.com/questions/14375118/gridview-item-list-selector-for-multiple-items-not-working-in-android