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How to implement Gridview? in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

We know that Gridview cannot set onClickListener and onLongClickListener. When Blank cell appears in GridView, sometimes you need to respond to click events, and there is no API to call.

The pointToPositon method in AbsListView can return the data position in the adapter corresponding to a point. When-1 is returned, the point is not on the visible point item and is a blank area. Using this method to set callbacks in dispatchTouchEvent can solve this problem.

The following is my implementation of Gridview that can add onClickListener and onLongClickListener. If you need it, please refer to it:

Import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.ViewConfiguration;import android.widget.GridView;public class ClickableGridView extends GridView {public ClickableGridView (Context context) {super (context);} public ClickableGridView (Context context, AttributeSet attrs) {super (context, attrs);} public ClickableGridView (Context context, AttributeSet attrs, int defStyleAttr) {super (context, attrs, defStyleAttr);} private OnNoItemClickListener clickListener Private OnNoItemLongClickListener longClickListener; private boolean mHasPerformedLongPress = false; private boolean isPressed; private CheckForLongPress checkForLongPress; public interface OnNoItemClickListener {public void onNoItemClick ();} public interface OnNoItemLongClickListener {public void onNoItemLongClick ();} public void setOnNoItemClickListener (OnNoItemClickListener listener) {this.clickListener = listener;} public void setOnNoItemLongClickListener (OnNoItemLongClickListener longClickListener) {this.longClickListener = longClickListener } @ Override public boolean dispatchTouchEvent (MotionEvent event) {/ / The pointToPosition () method returns-1 if the touch event / / occurs outside of a child View. If (pointToPosition ((int) event.getX (), (int) event.getY ()) =-1) {switch (event.getAction ()) {case MotionEvent.ACTION_DOWN: isPressed = true; mHasPerformedLongPress = false; if (checkForLongPress = = null) {checkForLongPress = new CheckForLongPress () } postDelayed (checkForLongPress, ViewConfiguration.getLongPressTimeout ()); break; case MotionEvent.ACTION_UP: if (! mHasPerformedLongPress) {removeCallbacks (checkForLongPress); if (clickListener! = null) {clickListener.onNoItemClick () }} else {mHasPerformedLongPress = false;} isPressed = false; break Case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_MOVE: default: removeCallbacks (checkForLongPress); isPressed = false; break;}} return super.dispatchTouchEvent (event) } private final class CheckForLongPress implements Runnable {@ Override public void run () {if (isPressed) {if (longClickListener! = null) {longClickListener.onNoItemLongClick (); mHasPerformedLongPress = true } the answer to the question on how to implement Gridview is shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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