安卓ImageView的：设置阻力和双指缩放参数缩放、阻力、参数、ImageView
2023-09-11 20:30:26
作者：氧气男神
我目前正在开发针对Android（我的第一个应用程序）的应用程序，它可以让用户看到地铁路线图，并能捏缩放，拖动左右。
我目前正在修改的Android你好，第3版中的code，得到了捏缩放和拖动工作。我使用的是矩阵作为我的布局规模。
不过，我现在有三个问题：
我试了很多东西来限制阻力参数，但我似乎无法阻止它被拖走父视图（和实际上可以从视野中消失）。我试着在XML文件中设置布局参数，它是行不通的。
我可以捏缩放不错，但我有麻烦，再次，限制变焦量。我试图玩弄设置max_zoom和min_zoom限制比例值（我会发布后，我的code）
我也有麻烦试图映射一个坐标上我的形象，使人们可以点击某些部分（该整点是让用户单击站地图，查看相关信息）
我有一种感觉，我遇到麻烦了，因为我使用的是矩阵的规模。
下面是我目前的code：
Touch.java
包org.example.touch;
进口android.app.Activity;
进口android.graphics.Bitmap;
进口android.graphics.Matrix;
进口android.graphics.PointF;
进口android.os.Bundle;
进口android.util.FloatMath;
进口android.util.Log;
进口android.view.MotionEvent;
进口android.view.View;
进口android.view.View.OnTouchListener;
进口android.widget.GridView;
进口android.widget.ImageView;
公共类触摸扩展活动实现OnTouchListener {
私有静态最后字符串变量=触摸;
私有静态最终浮动MIN_ZOOM = 1.0F;
私有静态最终浮动MAX_ZOOM = 5.0F;
//这些矩阵将用于移动和放大图像
字模=新的Matrix（）;
矩阵savedMatrix =新的Matrix（）;
//我们可以在这3个状态之一
静态最终诠释无= 0;
静态最终诠释DRAG = 1;
静态最终诠释ZOOM = 2;
INT模式=无;
//记住一些东西放大
的PointF开始=新的PointF（）;
的PointF中期=新的PointF（）;
浮oldDist = 1F;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
ImageView的观点=（ImageView的）findViewById（R.id.imageView）;
//view.setLayoutParams(new GridView.LayoutParams（85，85））;
view.setScaleType（ImageView.ScaleType.FIT_CENTER）;
view.setOnTouchListener（本）;
}
公共布尔onTouch（视图V，MotionEvent事件）{
ImageView的观点=（ImageView的）V;
view.setScaleType（ImageView.ScaleType.MATRIX）;
浮规模;
//转储触摸事件日志
dumpEvent（事件）;
//这里处理触摸事件...
开关（event.getAction（）及MotionEvent.ACTION_MASK）{
案例MotionEvent.ACTION_DOWN：//第一指仅下跌
savedMatrix.set（矩阵）;
start.set（event.getX（），event.getY（））;
Log.d（TAG模式= DRAG）;
模式=阻力;
打破;
案例MotionEvent.ACTION_UP：//第一手指抬起
案例MotionEvent.ACTION_POINTER_UP：//第二根手指抬起
模式=无;
Log.d（TAG模式= NONE）;
打破;
案例MotionEvent.ACTION_POINTER_DOWN：//第二根手指向下
oldDist =间距（事件）;
Log.d（TAG，oldDist =+ oldDist）;
如果（oldDist＆GT; 5F）{
savedMatrix.set（矩阵）;
中点（中，事件）;
模式=变焦;
Log.d（TAG模式= ZOOM）;
}
打破;
案例MotionEvent.ACTION_MOVE：
如果（模式==拖动）{//第一手指的运动
matrix.set（savedMatrix）;
如果（view.getLeft（）＆GT; = -392）{
matrix.postTranslate（event.getX（） - start.x，event.getY（） - start.y）;
}
}
否则，如果（模式==变焦）{//捏缩放
浮newDist =间距（事件）;
Log.d（TAG，newDist =+ newDist）;
如果（newDist＆GT; 5F）{
matrix.set（savedMatrix）;
规模= newDist / oldDist; ** //想我需要玩弄此值来限制它**
matrix.postScale（规模化，规模化，mid.x，mid.y）;
}
}
打破;
}
//执行转换
view.setImageMatrix（矩阵）;
返回true; //表示事件已经被处理
}
私人浮动间距（MotionEvent事件）{
浮X = event.getX（0） - event.getX（1）;
浮Y = event.getY（0） - event.getY（1）;
返回FloatMath.sqrt（X * X + Y * Y）;
}
私人无效中点（的PointF点，MotionEvent事件）{
浮X = event.getX（0）+ event.getX（1）;
浮Y = event.getY（0）+ event.getY（1）;
point.set（X / 2，Y / 2）;
}
/ **显示在LogCat中查看事件，调试* /
私人无效dumpEvent（MotionEvent事件）{
字符串名称[] = {DOWN，UP，移动，取消，外，
POINTER_DOWN，POINTER_UP，7？ 8？ 9？ };
StringBuilder的SB =新的StringBuilder（）;
INT行动= event.getAction（）;
INT行动code =动作和放大器; MotionEvent.ACTION_MASK;
sb.append（事件ACTION_）.append（名称[动作code]）;
如果（动作code == MotionEvent.ACTION_POINTER_DOWN
||行动code == MotionEvent.ACTION_POINTER_UP）{
sb.append（（PID）.append（
作用＆gt;＆GT; MotionEvent.ACTION_POINTER_ID_SHIFT）;
sb.append（））;
}
sb.append（[）;
的for（int i = 0; I＆LT; event.getPointerCount（）;我++）{
sb.append（＃）.append（ⅰ）;
sb.append（（PID）.append（event.getPointerId（ⅰ））;
sb.append（）=）.append（（int）的event.getX（ⅰ））;
sb.append（，）.append（（int）的event.getY（ⅰ））;
如果第（i + 1＆其中; event.getPointerCount（））
sb.append（;）;
}
sb.append（]）;
Log.d（TAG，sb.toString（））;
}
}
main.xml中（而不是简单的没有什么复杂的）：
＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;的FrameLayout
的xmlns：机器人=http://schemas.android.com/apk/res/android
机器人：layout_width =FILL_PARENT
机器人：layout_height =FILL_PARENT＆GT;
＆LT; ImageView的机器人：ID =@ + ID / ImageView的
机器人：layout_width =FILL_PARENT
机器人：layout_height =FILL_PARENT
机器人：SRC =@可绘制/图
机器人：scaleType =矩阵＆GT;
＆LT; / ImageView的＆GT;
＆LT; /的FrameLayout＆GT;
AndroidManifest.xml中（只加了这个主题，所以没有标题栏，是全屏）
＆LT;舱单的xmlns：机器人=http://schemas.android.com/apk/res/android
包=org.example.touch
安卓版code =7
机器人：VERSIONNAME =1.0＆GT;
＆lt;应用机器人：图标=@可绘制/图标机器人：标签=@字符串/ APP_NAME安卓主题=@安卓风格/ Theme.NoTitleBar.Fullscreen＆GT;
＆LT;活动机器人：名称=触摸
机器人：标签=@字符串/ APP_NAME＆GT;
＆LT;意向滤光器＆gt;
＆lt;作用机器人：名称=android.intent.action.MAIN/＆GT;
＆LT;类机器人：名称=android.intent.category.LAUNCHER/＆GT;
＆所述; /意图滤光器＆gt;
＆LT; /活性GT;
＆LT; /用途＆gt;
＆LT;使用-SDK安卓的minSdkVersion =3安卓targetSdkVersion =7/＆GT;
＆LT; /舱单＆GT;
解决方案
我刚刚创建的：
https://github.com/jasonpolites/gesture-imageview
可能是有用的人......
I am currently developing for Android (my first app) an application which lets users see the subway map and be able to pinch zoom and drag around.
I am currently modifying the code found in Hello Android, 3rd Edition and got the pinch zooming and dragging to work. I'm using Matrix as my layout scale.
However I now have 3 problems:
I tried many things to limit the drag parameters but I can't seem to stop it being dragged off the parent view (and can actually disappear from view). I've tried setting layout parameters in the XML file and it just doesn't work.
I can pinch zoom fine but I have trouble, again, limiting the amount of zoom. I'm trying to play around with setting a max_zoom and min_zoom to limit the scaling value (i will post my code after)
I also have trouble trying to map a coordinate on my image so that people can click on certain parts (the whole point of this is to let users click a station on the map and view information about it)
I have a feeling i'm having trouble because I'm using the matrix scale.
Here is my current code:
Touch.java
package org.example.touch;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.GridView;
import android.widget.ImageView;
public class Touch extends Activity implements OnTouchListener {
private static final String TAG = "Touch";
private static final float MIN_ZOOM = 1.0f;
private static final float MAX_ZOOM = 5.0f;
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView view = (ImageView) findViewById(R.id.imageView);
//view.setLayoutParams(new GridView.LayoutParams(85, 85));
view.setScaleType(ImageView.ScaleType.FIT_CENTER);
view.setOnTouchListener(this);
}
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
// Dump touch event to log
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: //first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG" );
mode = DRAG;
break;
case MotionEvent.ACTION_UP: //first finger lifted
case MotionEvent.ACTION_POINTER_UP: //second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE" );
break;
case MotionEvent.ACTION_POINTER_DOWN: //second finger down
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 5f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM" );
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) { //movement of first finger
matrix.set(savedMatrix);
if (view.getLeft() >= -392){
matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
}
}
else if (mode == ZOOM) { //pinch zooming
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 5f) {
matrix.set(savedMatrix);
scale = newDist / oldDist; **//thinking i need to play around with this value to limit it**
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
// Perform the transformation
view.setImageMatrix(matrix);
return true; // indicate event was handled
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent event) {
String names[] = { "DOWN" , "UP" , "MOVE" , "CANCEL" , "OUTSIDE" ,
"POINTER_DOWN" , "POINTER_UP" , "7?" , "8?" , "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_" ).append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN
|| actionCode == MotionEvent.ACTION_POINTER_UP) {
sb.append("(pid " ).append(
action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")" );
}
sb.append("[" );
for (int i = 0; i < event.getPointerCount(); i++) {
sb.append("#" ).append(i);
sb.append("(pid " ).append(event.getPointerId(i));
sb.append(")=" ).append((int) event.getX(i));
sb.append("," ).append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";" );
}
sb.append("]" );
Log.d(TAG, sb.toString());
}
}
main.xml (rather simple nothing really complicated):
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@drawable/map"
android:scaleType="matrix" >
</ImageView>
</FrameLayout>
AndroidManifest.xml (only added the theme so there is no title bar and is full screen)
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.example.touch"
android:versionCode="7"
android:versionName="1.0" >
<application android:icon="@drawable/icon" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
<activity android:name=".Touch"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="3" android:targetSdkVersion="7" />
</manifest>
解决方案
I just created this:
https://github.com/jasonpolites/gesture-imageview
Might be useful for someone...
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