我应该在哪里为主要活动实现setOnTouchListener [英] where should I implement setOnTouchListener for Main Activity
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问题描述
我有ActivityMain,该类具有OnSwipeTouchListener的内部类,该类包含触摸手势的逻辑.但是我不知道如何在我的onCreate函数中实现左右滑动.我想我需要在View或其他实现中引用mainactivity来实现它.但是我不知道怎么做.如果有人可以指出如何在onCreate方法中调用onSwipeRight和onSwipeLeft,就可以了.
I have ActivityMain which has inner class of OnSwipeTouchListener this class contains the logic for touch gestures. But I don't know how to implement swipe left and right within my onCreate function. I guess I would need to implement it on the View or this in referencing mainactivity. But I can't figure out how. If someone can point out how to call onSwipeRight and onSwipeLeft inside the onCreate method, appreciated.
package org.pctechtips.zentech.TestApp;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* Gestures and swipe class
*/
public class OnSwipeTouchListener implements View.OnTouchListener {
private final GestureDetector gestureDetector;
public OnSwipeTouchListener (Context ctx){
gestureDetector = new GestureDetector(ctx, new GestureListener());
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
private final class GestureListener extends GestureDetector.SimpleOnGestureListener {
private static final int SWIPE_THRESHOLD = 100;
private static final int SWIPE_VELOCITY_THRESHOLD = 100;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
boolean result = false;
try {
float diffY = e2.getY() - e1.getY();
float diffX = e2.getX() - e1.getX();
if (Math.abs(diffX) > Math.abs(diffY)) {
if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (diffX > 0) {
onSwipeRight();
} else {
onSwipeLeft();
}
result = true;
}
}
else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
if (diffY > 0) {
onSwipeBottom();
} else {
onSwipeTop();
}
result = true;
}
} catch (Exception exception) {
exception.printStackTrace();
}
return result;
}
}
public void onSwipeRight() {
Toast.makeText(MainActivity.this, "Right", Toast.LENGTH_SHORT).show();
}
public void onSwipeLeft() {
Toast.makeText(getApplicationContext(), "Left", Toast.LENGTH_SHORT).show();
}
public void onSwipeTop() {
}
public void onSwipeBottom() {
}
}
}
推荐答案
我在 https://stackoverflow.com/中回答了这个问题a/54004270/3279535
有不错的代码
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