目前,我在使用MultitouchView时遇到问题。我主要在这里使用Multitouchview的制作方式:http : //www.vogella.com/articles/AndroidTouch/article.html我的问题是,我的布局中有2个Imageview,并且我只想在两个都同时执行操作感动。我尝试通过获取位置(上,左,下,右)来找到它们,但是它总是返回nullpointer-exception。但是,我已经尝试过像这样在multitouchView中获取它们:
ImageView leftImage =(ImageView) findViewById(R.id.leftAlert);
int topLeft = leftImage.getTop();
int botLeft = leftImage.getBottom();
int leftLeft = leftImage.getLeft();
int rightLeft = leftImage.getRight();
ImageView rightImage =(ImageView) findViewById(R.id.rightAlert);
int topRight = rightImage.getTop();
int botRight = rightImage.getBottom();
int leftRight = rightImage.getLeft();
int rightRight = rightImage.getRight();
既然那行不通,我也已经尝试过以相同的方式获取我的主活动中的职位,并用如下的getter将其返回:
MainActivity Views = new MainActivity();
int topLeft= Views.getTopLeft();
int botLeft=Views.getBotLeft();
int leftLeft=Views.getleftLeft();
int rightLeft=Views.getRightLeft();
int topRight=Views.getTopRight();
int botRight=Views.getBotRight();
int leftRight=Views.getleftRight();
int rightRight=Views.getRightRight();
在主要活动中:
ImageView leftImage =(ImageView) findViewById(R.id.leftAlert);
int topLeft = leftImage.getTop();
int botLeft = leftImage.getBottom();
int leftLeft = leftImage.getLeft();
int rightLeft = leftImage.getRight();
ImageView rightImage =(ImageView) findViewById(R.id.rightAlert);
int topRight = rightImage.getTop();
int botRight = rightImage.getBottom();
int leftRight = rightImage.getLeft();
int rightRight = rightImage.getRight();
public int getTopLeft(){
return topLeft;
}
public int getBotLeft(){
return botLeft;
}
public int getleftLeft(){
return leftLeft;
}
public int getRightLeft(){
return rightLeft;
}
public int getTopRight(){
return topLeft;
}
public int getBotRight(){
return botLeft;
}
public int getleftRight(){
return leftLeft;
}
public int getRightRight(){
return rightLeft;
}
我仍在学习Android(这是我大学的一个项目),所以如果有人有一个简单的解决方案,我将非常高兴。
另外,我正在使用一部非常旧的手机进行测试,因此我无法为我的图像真正使用getX或getY函数(当前使用API级别9)。
目前,我在我的Images上摆弄了onTouchListeners,但是我觉得它应该可以这样工作,所以我想知道为什么它不适合我。
如果需要,这里是我的MultiTouchView.class:
package com.example.webanwendungengps;
import android.content.Context;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;
//this entire class is a View, that is able to handle multiple touches on a Screen
public class MultitouchView extends View {
MainActivity Views = new MainActivity();
int topLeft= Views.getTopLeft();
int botLeft=Views.getBotLeft();
int leftLeft=Views.getleftLeft();
int rightLeft=Views.getRightLeft();
int topRight=Views.getTopRight();
int botRight=Views.getBotRight();
int leftRight=Views.getleftRight();
int rightRight=Views.getRightRight();
private SparseArray<PointF> mActivePointers;
public MultitouchView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
private void initView() {
mActivePointers = new SparseArray<PointF>();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// get pointer index from the event object
int pointerIndex = event.getActionIndex();
// get pointer ID
int pointerId = event.getPointerId(pointerIndex);
// get masked (not specific to a pointer) action
int maskedAction = event.getActionMasked();
switch (maskedAction) {
case MotionEvent.ACTION_DOWN:{
float posX=event.getX();
float posY=event.getY();
if ((posX > leftLeft && posX <rightLeft && posY>botLeft && posY>topLeft)||
(posX > leftRight && posX <rightRight && posY>botRight && posY>topRight)){
ShowToast();
}
}
case MotionEvent.ACTION_POINTER_DOWN: {
if(event.getPointerCount()>=2){
float posX2=event.getX();
float posY2=event.getY();
if ((posX2 > leftLeft && posX2 <rightLeft && posY2>botLeft && posY2>topLeft)||
(posX2 > leftRight && posX2 <rightRight && posY2>botRight && posY2>topRight) ){
ShowToast();
}
}
break;
}
case MotionEvent.ACTION_MOVE: { // a pointer was moved
}
case MotionEvent.ACTION_UP: {
//Do Nothing
}
case MotionEvent.ACTION_POINTER_UP: {
//Do Nothing
}
case MotionEvent.ACTION_CANCEL: {
mActivePointers.remove(pointerId);
break;
}
}
invalidate();
return true;
}
private void ShowToast() {
Toast.makeText(getContext(), "Test", Toast.LENGTH_SHORT).show();
}
}
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