【发布时间】：2019-11-13 00:44:19
【问题描述】：
尽管我检查了一些线程，但在片段内同时使用 OnTouchListener 和 OnClickListener 时遇到问题。
自定义类：
import android.content.Context;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
public class Gestures implements View.OnTouchListener
{
private GestureDetector gestureDetector = null;
public Gestures()
{
gestureDetector = new GestureDetector(new GestureListener());
}
public boolean onTouch(View view, MotionEvent motionEvent)
{
boolean res = gestureDetector.onTouchEvent(motionEvent);
return res;
}
private final class GestureListener extends GestureDetector.SimpleOnGestureListener
{
private static final int SWIPE_THRESHOLD = 50;
private static final int SWIPE_VELOCITY_THRESHOLD = 50;
@Override
public void onLongPress(MotionEvent motionEvent)
{
onLongClick();
super.onLongPress(motionEvent);
}
@Override
public boolean onDown(MotionEvent motionEvent)
{
return true;
}
@Override
public boolean onFling(MotionEvent motionEvent1, MotionEvent motionEvent2, float velocityX, float velocityY)
{
boolean result = false;
try
{
float differenceX = motionEvent2.getX() - motionEvent1.getX();
float differenceY = motionEvent2.getY() - motionEvent1.getY();
if (Math.abs(differenceX) < Math.abs(differenceY))
{
if (Math.abs(differenceY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD)
{
if (differenceY > 0)
{
result = onSwipeBottom();
}
else
{
result = onSwipeTop();
}
}
else
{
result = nothing();
}
}
}
catch (Exception exception)
{
exception.printStackTrace();
}
return result;
}
}
public boolean nothing()
{
return false;
}
public boolean onSwipeTop()
{
return false;
}
public boolean onSwipeBottom()
{
return false;
}
public boolean onLongClick()
{
return false;
}
}
片段：
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.fragment.app.Fragment;
public class Fragment1 extends Fragment implements View.OnClickListener, View.OnTouchListener
{
ConstraintLayout constraintLayoutOne, constraintLayoutTwo;
@Override public void onResume()
{
super.onResume();
constraintLayoutOne = getActivity().findViewById(R.id.constraint_layout_one); // Link variable to ID
constraintLayoutTwo = getActivity().findViewById(R.id.constraint_layout_two); // Link variable to ID
getActivity().findViewById(R.id.constraint_layout_one).setOnClickListener(this);
getActivity().findViewById(R.id.constraint_layout_two).setOnClickListener(this);
getActivity().findViewById(R.id.constraint_layout_one).setOnTouchListener(this);
getActivity().findViewById(R.id.constraint_layout_two).setOnTouchListener(this);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{
View fragment1 = inflater.inflate(R.layout.fragment1, container, false); // Link view and layout
return fragment1;
}
@Override
public boolean onTouch(View view, MotionEvent motionEvent)
{
switch (view.getId())
{
case R.id.constraint_layout_one:
case R.id.constraint_layout_two:
view.setOnTouchListener(new Gestures()
{
public boolean onSwipeTop()
{
showToast("swiped up");
return false;
}
public boolean onSwipeBottom()
{
showToast("swiped down");
return false;
}
});
}
return false;
}
@Override
public void onClick(View view)
{
if (view.getId() == R.id.constraint_layout_one)
{
showToast("button one clicked");
}
if (view.getId() == R.id.constraint_layout_two)
{
showToast("button two clicked");
}
}
public void showToast(String text)
{
Toast toast = Toast.makeText(getContext(), text, Toast.LENGTH_SHORT); // Generate toast message
toast.setGravity(Gravity.CENTER| Gravity.CENTER, 0, -1); // Change y-Position of toast a bit
toast.show(); // Show toast for 4 seconds
}
}
两个问题：
1) 当我启动应用程序时，滑动不起作用。当我滑动时没有任何反应。 我必须执行 2 次滑动才能使其正常工作。 之后，我可以随心所欲地滑动。
2) 点击只工作一次。 第一次点击后，不再识别更多点击（对于点击的视图） 当我进行两次滑动时也会发生同样的情况 - 不再点击。
任何帮助将不胜感激！
【问题讨论】：