问题
I have a GridView with 81 buttons on it. I want to add clicklistener to this gridview but it is not available. I have added the OnItemClickListener but it is not working and I cannot understand why. There is no error with the code. The only thing not working is the OnItemClickListener.
My gridview children which has a button on it(gridview_members.xml);
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:id="@+id/city"
android:layout_width="183dp"
android:layout_height="90dp"
android:textSize="19sp"
android:textStyle="bold"
android:text="Code\n\nCity"
android:gravity="center"
android:background="@drawable/city_btn_tablet" />
</RelativeLayout>
My ImageAdapter class;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return 81;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
gridView =new View(mContext);
gridView = inflater.inflate(R.layout.gridview_members, null);
Button city = (Button) gridView.findViewById(R.id.city);
return gridView;
}
}
Gridview implementation on activity_main.xml ;
<GridView
android:id="@+id/gridview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:horizontalSpacing="5dp"
android:verticalSpacing="5dp"
android:gravity="center"
android:stretchMode="columnWidth"
android:numColumns="6" >
</GridView>
And finally my MainActivity.java file;
public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this));
gridview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(MainActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
}
回答1:
You are requesting click on the item(not on the button inside the item) so need to change your child XML layout
from
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:id="@+id/city"
android:layout_width="183dp"
android:layout_height="90dp"
android:textSize="19sp"
android:textStyle="bold"
android:text="Code\n\nCity"
android:gravity="center"
android:background="@drawable/city_btn_tablet" />
</RelativeLayout>
to
<?xml version="1.0" encoding="utf-8"?>
<Button
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/city"
android:layout_width="183dp"
android:layout_height="90dp"
android:textSize="19sp"
android:clickable="true"
android:textStyle="bold"
android:text="Code\n\nCity"
android:gravity="center"
android:background="@drawable/city_btn_tablet" />
or you can add ClickListener inside adapter
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
gridView =new View(mContext);
gridView = inflater.inflate(R.layout.gridview_members, null);
Button city = (Button) gridView.findViewById(R.id.city);
city.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Toast here
}});
return gridView;
}
回答2:
GridView is clickable no need to put button inside GridView.
To add listener to the grid add the following code:
// Implement On Item click listener
gridView1.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position) {
case 0:
break;
case 1:
break;
}
}
});
And so on you can add all numbers in the cases.
回答3:
If you want to get text that clicked item you can use this
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String item = ((TextView)view.findViewById(R.id.ID_OF_TEXTVIEW)).getText().toString();
Toast.makeText(showMissions.this, "" + item, Toast.LENGTH_SHORT).show();
}
});
回答4:
I am suggesting you to add click listener in getview method rather than adding in activity class. try this code
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
gridView =new View(mContext);
gridView = inflater.inflate(R.layout.gridview_members, null);
Button city = (Button) gridView.findViewById(R.id.city);
city.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//Do your task here
}
});
return gridView;
}
回答5:
In your CustomAdapter into
onBindViewHolder(...
{
yourViewHolder.gridview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Do Something
}
});
}
回答6:
You can add click listener this way to your grid view items in Kotlin
grdlyt_merchant_color_code.onItemClickListener = AdapterView.OnItemClickListener { parent, view, position, id ->
loyaltyColor = parent.getItemAtPosition(position) as LoyaltyColor?
colorCode= LoyaltyUtils.getLoyaltyColorById(loyaltyColor!!.colorId).colorCode
val color = ContextCompat.getColor(requireContext(), colorCode!!)
shape.setColor(color)
loyalty_card_img.background = shape
uncheckAllColors()
loyalty_card_img.visibility = View.GONE
loyaltyColor!!.isColorSelected = true
mAdapter.notifyDataSetChanged()
}
来源：https://stackoverflow.com/questions/20191914/how-to-add-gridview-setonitemclicklistener