安卓多点触控 - ToB企服应用市场:ToB评测及商务社交产业平台

package com.example.study.controller;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class PointerCollection {
private List<Pointer> pointers;
public PointerCollection() {
pointers = new ArrayList<>();
}
/**
* 手指按下时，给当前触控点生成pointerId
*
* @return 生成的pointerId
*/
public int pressDown() {
int index = 0;
for (; index < pointers.size(); index++) {
if (pointers.get(index).pointerId != index) {
break;
}
}
pointers.add(index, new Pointer(index));
return index;
}
/**
* 手指抬起时，回收触控点
*
* @param pointerId 触控点Id
* @return 回收的触控点
*/
public int pressUp(int pointerId) {
Iterator<Pointer> iterator = pointers.iterator();
while (iterator.hasNext()) {
Pointer pointer = iterator.next();
if (pointer.pointerId == pointerId) {
iterator.remove();
break;
}
}
return pointerId;
}
/**
* 获取pointerId对应的索引pointerIndex
*
* @param pointerId pointerId
* @return pointerIndex
*/
public int findPointerIndex(int pointerId) {
for (int index = 0; index < pointers.size(); index++) {
if (pointers.get(index).pointerId == pointerId) {
return index;
}
}
return -1;
}
class Pointer {
int pointerId;
public Pointer(int pointerId) {
this.pointerId = pointerId;
}
}
public String toString() {
StringBuilder sb = new StringBuilder();
for (int pointerIndex = 0; pointerIndex < pointers.size(); pointerIndex++) {
sb.append("{pointerId: " + pointers.get(pointerIndex).pointerId + ", pointerIndex:" + pointerIndex + "} ");
}
return sb.toString();
}
}

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package org.tao.hetools.listeners;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
public class MulTouchListener implements View.OnTouchListener {
private Map<Integer, float[]> pointerMap = new HashMap<>();
@Override
public boolean onTouch(View view, MotionEvent event) {
updatePointer(event);
return true;
}
private void updatePointer(MotionEvent event) {
int actionMasked = event.getActionMasked();
int actionIndex = event.getActionIndex();
int pointerId = event.getPointerId(actionIndex);
switch (actionMasked) {
case MotionEvent.ACTION_DOWN:
pointerMap.clear();
case MotionEvent.ACTION_POINTER_DOWN:
pointerMap.put(pointerId, new float[]{event.getX(actionIndex), event.getY(actionIndex)});
Log.i("记录按压事件", String.format("第%d根手指按下", pointerId));
return;
case MotionEvent.ACTION_POINTER_UP:
pointerMap.remove(pointerId);
Log.i("记录按压事件", String.format("第%d根手指抬起", pointerId));
return;
case MotionEvent.ACTION_UP:
pointerMap.clear();
Log.i("记录按压事件", String.format("所有手指抬起", pointerId));
return;
case MotionEvent.ACTION_MOVE:
break;
default:
return;
}
StringBuilder sb = new StringBuilder("所有手指位置信息如下 ");
for (Map.Entry<Integer, float[]> entry : pointerMap.entrySet()) {
int pointerIndex = event.findPointerIndex(entry.getKey());
float[] currentPointer = {event.getX(pointerIndex), event.getY(pointerIndex)};
entry.setValue(currentPointer);
sb.append(String.format(Locale.CHINESE, "%d:(%1.4f, %1.4f) ", entry.getKey(),
event.getX(pointerIndex),
event.getY(pointerIndex)));
}
Log.i("记录移动事件", sb.toString());
}
}

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package org.tao.hetools.activities;
import android.os.Bundle;
import android.view.View;
import androidx.activity.ComponentActivity;
import androidx.annotation.Nullable;
import org.tao.hetools.R;
import org.tao.hetools.listeners.MulTouchListener;
public class TouchListenerActivity extends ComponentActivity {
private View view;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.activity_touch_listener);
view = findViewById(R.id.touch_listener_view);
view.setOnTouchListener(new MulTouchListener());
}
}

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<?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">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:id="@+id/touch_listener_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white" />
</FrameLayout>
</RelativeLayout>

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