如何检测单点触摸和多点触控的onTouchEvent（） [英] How to detect single touch as well as multi-touch in onTouchEvent()
本文介绍了如何检测单点触摸和多点触控的onTouchEvent（）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我用下面的code检测单指触控，双指触控。在code检测到双手指触摸时（计数== 2 ）。
我需要做单点触摸的一些动作也。如果我触摸屏幕用一个手指就不会去为别人的一部分。我在这code做错了？
@覆盖
公共布尔的onTouchEvent（MotionEvent事件）{
INT行动= event.getAction（）及MotionEvent.ACTION_MASK;
开关（动作）{
案例MotionEvent.ACTION_POINTER_UP：{
诠释计数= event.getPointerCount（）;
Log.v（算＆GT;＆gt;中，数+）;
如果（计数== 2）{
//一些行动
} 其他 {
Log.v（计数不等于2，不是2）;
}
打破;
}
}
返回true;
}
更新：
我用这个code的活动里面。我需要做检测单点触摸，多点触摸。
在我的活动，我有两个图像，一个在左边，一个在右边。如果我点击了图像处理的一些已经完成。如果我用两个手指，我需要重新大小的图像，根据比例因子。
这是我用code：
更新：
包com.pinch.detect;
进口java.io.BufferedInputStream中;
进口java.io.IOException异常;
进口的java.io.InputStream;
进口java.net.MalformedURLException;
进口的java.net.URL;
进口java.net.URLConnection中;
进口android.app.Activity;
进口android.content.Context;
进口android.content.ContextWrapper;
进口android.graphics.Bitmap;
进口android.graphics.BitmapFactory;
进口android.os.Bundle;
进口android.util.FloatMath;
进口android.util.Log;
进口android.view.Display;
进口android.view.MotionEvent;
进口android.view.ScaleGestureDetector;
进口android.view.View;
进口android.view.ScaleGestureDetector.SimpleOnScaleGestureListener;
进口android.view.View.OnClickListener;
进口android.view.View.OnTouchListener;
进口android.widget.ImageView;
进口android.widget.TextView;
进口android.widget.Toast;
公共类PinchDetectorActivity延伸活动{
TextView的textGestureAction;
ImageView的IMG1，IMG2;
静态位图BM，BM1;
布尔多点触控= FALSE;
上下文语境;
浮动比例因子= 0.0;
浮动lastscale;
INT scr_width，scr_height;
显示屏显示;
私人ScaleGestureDetector scaleGestureDetector;
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
textGestureAction =（TextView中）findViewById（R.id.GestureAction）;
IMG1 =（ImageView的）findViewById（R.id.img_left）;
IMG2 =（ImageView的）findViewById（R.id.img_right）;
显示器= getWindowManager（）getDefaultDisplay（）。
scr_width = display.getWidth（）;
scr_height = display.getHeight（）;
Log.v（宽度GT;＆gt;中，Integer.toString（scr_width））;
Log.v（高度＆GT;＆gt;中，Integer.toString（scr_height））;
BM = BitmapFactory.de codeResource（this.getResources（）
R.drawable.fiction1）;
img1.setImageBitmap（BM）;
BM1 = BitmapFactory.de codeResource（this.getResources（）
R.drawable.fiction2）;
img2.setImageBitmap（BM1）;
img1.setScaleType（ImageView.ScaleType.FIT_START）;
img2.setScaleType（ImageView.ScaleType.FIT_END）;
scaleGestureDetector =新ScaleGestureDetector（这一点，
新MySimpleOnScaleGestureListener（））;
img1.setOnTouchListener（新OnTouchListener（）{
@覆盖
公共布尔onTouch（视图V，MotionEvent事件）{
// TODO自动生成方法存根
返回false;
}
}）;
}
@覆盖
公共布尔的onTouchEvent（MotionEvent事件）{
scaleGestureDetector.onTouchEvent（事件）;
INT指数= event.getActionIndex（）;
Log.v（指数值，指数+）;
INT行动= event.getAction（）;
如果（索引== 1）{
多点触控=真;
的System.out.println（mutli1）;
}否则，如果（多点触控== FALSE）{
的System.out.println（single1）;
img1.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
Log.v（点击image1的，IMG1＆GT;＆GT;＆gt;中）;
}
}）;
img2.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{// TODO自动生成方法
Log.v（点击图像2，IMG2＆GT;＆GT;＆gt;中）;
}
}）;
}
否则，如果（行动== MotionEvent.ACTION_MOVE和放大器;＆安培;多点触控）{
的System.out.println（mutli2）;
如果（比例因子大于1）{
位图resizedbitmap = Bitmap.createScaledBitmap（BM，
scr_width / 2，scr_height，真正的）;
img1.setImageBitmap（resizedbitmap）;
位图resizedbitmap1 = Bitmap.createScaledBitmap（BM1，
scr_width / 2，scr_height，真正的）;
img2.setImageBitmap（resizedbitmap1）;
Log.v（宽度GT;＆gt;中，Integer.toString（scr_width））;
Log.v（高度＆GT;＆gt;中，Integer.toString（scr_height））;
}否则如果（比例因子＆LT; 1）{
Log.v（宽度GT;＆gt;中，Integer.toString（scr_width））;
Log.v（高度＆GT;＆gt;中，Integer.toString（scr_height））;
如果（scr_width＆GT; = 640）{
位图resizedbitmap = Bitmap.createScaledBitmap（BM，
scr_height + 90，scr_height，真正的）;
img1.setImageBitmap（resizedbitmap）;
位图resizedbitmap1 = Bitmap.createScaledBitmap（BM1，
scr_height + 90，scr_height，真正的）;
img2.setImageBitmap（resizedbitmap1）;
} 其他 {
位图resizedbitmap = Bitmap.createScaledBitmap（BM，
scr_height，scr_height + 30，真正的）;
img1.setImageBitmap（resizedbitmap）;
位图resizedbitmap1 = Bitmap.createScaledBitmap（BM1，
scr_height，scr_height + 30，真正的）;
img2.setImageBitmap（resizedbitmap1）;
}
}
}否则，如果（行动== MotionEvent.ACTION_MOVE和放大器;＆安培;！多点触控）
{
的System.out.println（single2）;
}
返回super.onTouchEvent（事件）;
}
公共类MySimpleOnScaleGestureListener扩展
SimpleOnScaleGestureListener {
@覆盖
公共布尔onScale（ScaleGestureDetector检测器）{
// TODO自动生成方法存根
比例因子= detector.getScaleFactor（）;
Log.v（比例因子＆GT;＆GT;＆gt;中，比例因子+）;
返回true;
}
}
}
和我的main.xml是
＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; RelativeLayout的的xmlns：机器人=http://schemas.android.com/apk/res/android
机器人：layout_width =FILL_PARENT
机器人：layout_height =WRAP_CONTENT
机器人：方向=垂直
机器人：ID =@ + ID / pinchlay＆GT;
＆LT; ImageView的
机器人：ID =@ + ID / img_left
机器人：layout_width =320dp
机器人：layout_height =FILL_PARENT
/＆GT;
＆LT; ImageView的
机器人：ID =@ + ID / img_right
机器人：layout_width =320dp
机器人：layout_height =FILL_PARENT
机器人：layout_alignParentRight =真
/＆GT;
＆LT; / RelativeLayout的＆GT;
解决方案
如果我理解正确的话，单点触摸不会引起ACTION_POINTER_UP，但ACTION_UP。这就是为什么它没有检测到单个手指。看到这个帖子，以供参考： http://stackoverflow.com/a/4269592/1084813
I used the following code to detect the single finger touch and double finger touch. The code detects the double finger touch (when count==2).
I need to do some action on single touch also. If I touch the screen with one finger it doesn't go for the else part. What I have done wrong in this code?
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction() & MotionEvent.ACTION_MASK;
switch (action) {
case MotionEvent.ACTION_POINTER_UP: {
int count = event.getPointerCount();
Log.v("count >>", count + "");
if (count == 2) {
// some action
} else {
Log.v("count not equal to 2", "not 2");
}
break;
}
}
return true;
}
Update:
I used this code inside an Activity. I need do detect single touch, multi-touch.
In my activity, I have two images, one on the left and one on the right. If I click the image some process has to done. If I use two fingers, I need to re-size the images, according to the scaleFactor.
This is the code that I've used:
Updated :
package com.pinch.detect;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ScaleGestureDetector.SimpleOnScaleGestureListener;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class PinchDetectorActivity extends Activity {
TextView textGestureAction;
ImageView img1, img2;
static Bitmap bm, bm1;
boolean multiTouch = false;
Context context;
float scaleFactor = 0.0f;
float lastscale;
int scr_width, scr_height;
Display display;
private ScaleGestureDetector scaleGestureDetector;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textGestureAction = (TextView) findViewById(R.id.GestureAction);
img1 = (ImageView) findViewById(R.id.img_left);
img2 = (ImageView) findViewById(R.id.img_right);
display = getWindowManager().getDefaultDisplay();
scr_width = display.getWidth();
scr_height = display.getHeight();
Log.v("width >>", Integer.toString(scr_width));
Log.v("height >>", Integer.toString(scr_height));
bm = BitmapFactory.decodeResource(this.getResources(),
R.drawable.fiction1);
img1.setImageBitmap(bm);
bm1 = BitmapFactory.decodeResource(this.getResources(),
R.drawable.fiction2);
img2.setImageBitmap(bm1);
img1.setScaleType(ImageView.ScaleType.FIT_START);
img2.setScaleType(ImageView.ScaleType.FIT_END);
scaleGestureDetector = new ScaleGestureDetector(this,
new MySimpleOnScaleGestureListener());
img1.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
scaleGestureDetector.onTouchEvent(event);
int index = event.getActionIndex();
Log.v("Index value ",index+"");
int action = event.getAction();
if (index == 1) {
multiTouch = true;
System.out.println("mutli1");
} else if (multiTouch == false) {
System.out.println("single1");
img1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.v("clicked image1","img1>>>");
}
});
img2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) { // TODO Auto-generated method
Log.v("clicked image2","img2>>>");
}
});
}
else if (action == MotionEvent.ACTION_MOVE && multiTouch) {
System.out.println("mutli2");
if (scaleFactor > 1) {
Bitmap resizedbitmap = Bitmap.createScaledBitmap(bm,
scr_width / 2, scr_height, true);
img1.setImageBitmap(resizedbitmap);
Bitmap resizedbitmap1 = Bitmap.createScaledBitmap(bm1,
scr_width / 2, scr_height, true);
img2.setImageBitmap(resizedbitmap1);
Log.v("width >>", Integer.toString(scr_width));
Log.v("height >>", Integer.toString(scr_height));
} else if(scaleFactor<1){
Log.v("width >>", Integer.toString(scr_width));
Log.v("height >>", Integer.toString(scr_height));
if (scr_width >= 640) {
Bitmap resizedbitmap = Bitmap.createScaledBitmap(bm,
scr_height + 90, scr_height, true);
img1.setImageBitmap(resizedbitmap);
Bitmap resizedbitmap1 = Bitmap.createScaledBitmap(bm1,
scr_height + 90, scr_height, true);
img2.setImageBitmap(resizedbitmap1);
} else {
Bitmap resizedbitmap = Bitmap.createScaledBitmap(bm,
scr_height, scr_height + 30, true);
img1.setImageBitmap(resizedbitmap);
Bitmap resizedbitmap1 = Bitmap.createScaledBitmap(bm1,
scr_height, scr_height + 30, true);
img2.setImageBitmap(resizedbitmap1);
}
}
} else if (action == MotionEvent.ACTION_MOVE && !multiTouch)
{
System.out.println("single2");
}
return super.onTouchEvent(event);
}
public class MySimpleOnScaleGestureListener extends
SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
// TODO Auto-generated method stub
scaleFactor = detector.getScaleFactor();
Log.v("scaleFactor >>>", scaleFactor + "");
return true;
}
}
}
and my main.xml is
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/pinchlay" >
<ImageView
android:id="@+id/img_left"
android:layout_width="320dp"
android:layout_height="fill_parent"
/>
<ImageView
android:id="@+id/img_right"
android:layout_width="320dp"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
解决方案
If I understand correctly, single touch will not cause ACTION_POINTER_UP, but ACTION_UP. That is why it doesn't detect the single finger. See this post for reference: http://stackoverflow.com/a/4269592/1084813
这篇关于如何检测单点触摸和多点触控的onTouchEvent（）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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