首先，我想说，我在Android上并不强大。我正在尝试为我的应用程序添加缩放和平移。
在这里，我使用本教程从url加载我的图像并将其显示为ImageView。
http://www.androidhive.info/2012/07/android-loading-image-from-url-http/
我找到了这个教程：http://www.c-sharpcorner.com/UploadFile/88b6e5/multi-touch-panning-pinch-zoom-image-view-in-android-using/如何缩放和平移我的图像，但我真的不知道，我必须如何从第一个教程更改代码，以获取ImageView，我可以缩放和平移
有人可以帮助我吗？
答案 0 :(得分：1)
我已经在几个应用程序中一起使用它们，它们可以很好地协同工作：）
答案 1 :(得分：0)
try this code..
/**
* Author : Ramesh R
* Created : 11/25/13 10:11 PM
* ----------------------------------------------------------------------
* Copyright © EMD Systems Software Private Ltd. All rights reserved.
* This file is subject to the terms and conditions defined in
* file 'LICENSE.txt', which is part of this source code package.
* All other rights reserved.
* ----------------------------------------------------------------------
*/
package com.emdsys.android.pacs.viewer.model;
import com.emdsys.android.pacs.R;
import com.emdsys.android.pacs.activity.TabActivityPacs;
import com.emdsys.android.pacs.activity.ViewerActivity;
import com.emdsys.android.pacs.shared.Config;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.v4.view.VelocityTrackerCompat;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnDoubleTapListener;
import android.view.GestureDetector.OnGestureListener;
import android.view.animation.DecelerateInterpolator;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.VelocityTracker;
import android.view.View;
import android.widget.ImageView;
@SuppressLint("Recycle")
public class TouchImageView extends ImageView {
private Matrix mMatrix;
// 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;
public static Rect startBounds;
// Remember some things for zooming
PointF last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;
public static float startScaleFinal;
public static int tab_check = 0;
int viewWidth, viewHeight;
static final int CLICK = 3;
float saveScale = 1f;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;
public int touchActionDownX = 0;
public int touchActionDownY = 0;
ScaleGestureDetector mScaleDetector;
GestureDetector hidingevent;
private int check = 0;
private VelocityTracker mVelocityTracker = null;
Context context;
int pre_x = 0, pre_y = 0;
public int check_for_unwanted = 0;
private static Animator mCurrentAnimator;
private static int mShortAnimationDuration = 500;
public static TouchImageView full_image;
public static View maintainView;
public TouchImageView(Context context) {
super(context);
sharedConstructing(context);
}
public TouchImageView(Context context, AttributeSet attrs) {
super(context, attrs);
sharedConstructing(context);
}
private void sharedConstructing(Context context) {
super.setClickable(true);
this.context = context;
TouchImageView.tab_check = 0;
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
hidingevent = new GestureDetector(context, new singleTablistener());
mMatrix = new Matrix();
m = new float[9];
setImageMatrix(mMatrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
maintainView = v;
hidingevent.onTouchEvent(event);
if (ViewerActivity.sClick == 1) {
mScaleDetector.onTouchEvent(event);
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
last.set(curr);
start.set(last);
mode = DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
float deltaX = curr.x - last.x;
float deltaY = curr.y - last.y;
float fixTransX = getFixDragTrans(deltaX,
viewWidth, origWidth * saveScale);
float fixTransY = getFixDragTrans(deltaY,
viewHeight, origHeight * saveScale);
mMatrix.postTranslate(fixTransX, fixTransY);
fixTrans();
last.set(curr.x, curr.y);
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(mMatrix);
invalidate();
return true; // indicate event was handled
} else {
//
// Drag motion of the image view is achieved here.....
//
int index = event.getActionIndex();
int action = event.getActionMasked();
int pointerId = event.getPointerId(index);
switch (action) {
case MotionEvent.ACTION_DOWN:
if (mVelocityTracker == null) {
// Retrieve a new VelocityTracker object to watch
// the
// velocity of a motion.
mVelocityTracker = VelocityTracker.obtain();
} else {
// Reset the velocity tracker back to its initial
// state.
mVelocityTracker.clear();
}
// Add a user's movement to the tracker
touchActionDownX = (int) event.getX();
touchActionDownY = (int) event.getY();
pre_x = (int) event.getX();
pre_y = (int) event.getY();
mVelocityTracker.addMovement(event);
break;
case MotionEvent.ACTION_MOVE:
mVelocityTracker.addMovement(event);
mVelocityTracker.computeCurrentVelocity(1000);
Log.d("", "DownX: " + touchActionDownX);
Log.d("", "DownY: " + touchActionDownY);
// On touch point identification..
int New_x = (int) event.getX();
int New_y = (int) event.getY();
//
// velocity of the pointer movement in the display...
//
int Velocityx = Math.abs((int) VelocityTrackerCompat
.getXVelocity(mVelocityTracker, pointerId));
int Velocityy = Math.abs((int) VelocityTrackerCompat
.getYVelocity(mVelocityTracker, pointerId));
if ((Math.abs(New_x - pre_x) > 3)
|| (Math.abs(New_y - pre_y) > 3)) {
ViewerActivity.sDiffx = ((pre_x - New_x) / 3);
ViewerActivity.sDiffy = ((pre_y - New_y) / 3);
if ((ViewerActivity.sDiffx >= 0)
&& (ViewerActivity.sDiffy >= 0)) {
if (check == 0) {
ViewerActivity.selecting_mode(Velocityx,
Velocityy, 1);
Log.d("", "Loop1");
check++;
} else {
check = 0;
}
} else if ((ViewerActivity.sDiffx <= 0)
&& (ViewerActivity.sDiffy >= 0)) {
if (check == 0) {
ViewerActivity.selecting_mode(Velocityx,
Velocityy, 1);
Log.d("", "Loop1");
check++;
} else {
check = 0;
}
} else if ((ViewerActivity.sDiffx <= 0)
&& ViewerActivity.sDiffy <= 0) {
if (check == 0) {
ViewerActivity.selecting_mode(Velocityx,
Velocityy, 1);
Log.d("", "Loop1");
check++;
} else {
check = 0;
}
} else if ((ViewerActivity.sDiffx >= 0)
&& ViewerActivity.sDiffy <= 0) {
if (check == 0) {
ViewerActivity.selecting_mode(Velocityx,
Velocityy, 1);
Log.d("", "Loop1");
check++;
} else {
check = 0;
}
} else {
// Nothing is executing here....
}
}
pre_x = New_x;
pre_y = New_y;
break;
case MotionEvent.ACTION_UP:
check_for_unwanted = 1;
// if(TouchImageView.tab_check!=1)
// {
//
// }
case MotionEvent.ACTION_CANCEL:
// mVelocityTracker.recycle();
if (check_for_unwanted == 1) {
ViewerActivity.update_image(111);
} else {
ViewerActivity.selecting_mode(0, 0, 0);
}
break;
}
return true;
}
}
});
}
public void setMaxZoom(float x) {
maxScale = x;
}
private class ScaleListener extends
ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float mScaleFactor = detector.getScaleFactor();
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale) {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
} else if (saveScale < minScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
if (origWidth * saveScale <= viewWidth
|| origHeight * saveScale <= viewHeight)
mMatrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2,
viewHeight / 2);
else
mMatrix.postScale(mScaleFactor, mScaleFactor,
detector.getFocusX(), detector.getFocusY());
// creation of reset button in viewer
if ((viewHeight > ViewerActivity.sResetHeight)
&& (viewWidth > ViewerActivity.sResetWidth)) {
ViewerActivity.sResetImageButton.setVisibility(View.GONE);
} else {
ViewerActivity.sResetImageButton.setVisibility(View.GONE);
}
fixTrans();
return true;
}
}
void fixTrans() {
mMatrix.getValues(m);
float transX = m[Matrix.MTRANS_X];
float transY = m[Matrix.MTRANS_Y];
float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
float fixTransY = getFixTrans(transY, viewHeight, origHeight
* saveScale);
if (fixTransX != 0 || fixTransY != 0)
mMatrix.postTranslate(fixTransX, fixTransY);
// visibility of the image reset button...
}
float getFixTrans(float trans, float viewSize, float contentSize) {
float minTrans, maxTrans;
if (contentSize <= viewSize) {
minTrans = 0;
maxTrans = viewSize - contentSize;
} else {
minTrans = viewSize - contentSize;
maxTrans = 0;
}
if (trans < minTrans)
return -trans + minTrans;
if (trans > maxTrans)
return -trans + maxTrans;
return 0;
}
float getFixDragTrans(float delta, float viewSize, float contentSize) {
if (contentSize <= viewSize) {
return 0;
}
return delta;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);
viewHeight = MeasureSpec.getSize(heightMeasureSpec);
//
// Rescaled image on rotation
//
if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
|| viewWidth == 0 || viewHeight == 0)
return;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth;
if (saveScale == 1) {
// Fit to screen.
float scale;
Drawable drawable = getDrawable();
if (drawable == null || drawable.getIntrinsicWidth() == 0
|| drawable.getIntrinsicHeight() == 0)
return;
int bmWidth = drawable.getIntrinsicWidth();
int bmHeight = drawable.getIntrinsicHeight();
Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);
float scaleX = (float) viewWidth / (float) bmWidth;
float scaleY = (float) viewHeight / (float) bmHeight;
scale = Math.min(scaleX, scaleY);
mMatrix.setScale(scale, scale);
// Center the image
float redundantYSpace = (float) viewHeight
- (scale * (float) bmHeight);
float redundantXSpace = (float) viewWidth
- (scale * (float) bmWidth);
redundantYSpace /= (float) 2;
redundantXSpace /= (float) 2;
mMatrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
setImageMatrix(mMatrix);
}
fixTrans();
}
public class singleTablistener implements OnDoubleTapListener,
OnGestureListener {
@Override
public boolean onDoubleTap(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
return false;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
if (ViewerActivity.sHide == 0) {
TouchImageView.tab_check = 1;
TabActivityPacs.tabs.setVisibility(View.GONE);
TabActivityPacs.recorder_Layout.setVisibility(View.GONE);
TabActivityPacs.layout.setVisibility(View.GONE);
TabActivityPacs.playerloyout.setVisibility(View.GONE);
TabActivityPacs.Tab_whole.setVisibility(View.GONE);
final Bitmap bitmap = (Bitmap) ((BitmapDrawable) ((ImageView) ViewerActivity.sImage)
.getDrawable()).getBitmap();
zoomImageFromThumb(ViewerActivity.sImage, bitmap);
ViewerActivity.sHide = 1;
return true;
} else {
if (TouchImageView.mCurrentAnimator != null) {
TouchImageView.mCurrentAnimator.cancel();
}
// Animate the four positioning/sizing properties in parallel,
// back to their original values.
AnimatorSet set = new AnimatorSet();
set.play(
ObjectAnimator.ofFloat(
TabActivityPacs.expandedImageView, View.X,
TouchImageView.startBounds.left))
.with(ObjectAnimator.ofFloat(
TabActivityPacs.expandedImageView, View.Y,
TouchImageView.startBounds.top))
.with(ObjectAnimator.ofFloat(
TabActivityPacs.expandedImageView,
View.SCALE_X, TouchImageView.startScaleFinal))
.with(ObjectAnimator.ofFloat(
TabActivityPacs.expandedImageView,
View.SCALE_Y, TouchImageView.startScaleFinal));
set.setDuration(TouchImageView.mShortAnimationDuration);
set.setInterpolator(new DecelerateInterpolator());
set.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
TouchImageView.full_image.setAlpha(1f);
TabActivityPacs.tabs.setVisibility(View.VISIBLE);
TabActivityPacs.Tab_whole.setVisibility(View.VISIBLE);
if (Config.sUserType.equalsIgnoreCase("radiologist")) {
TabActivityPacs.recorder_Layout
.setVisibility(View.VISIBLE);
} else {
TabActivityPacs.playerloyout
.setVisibility(View.VISIBLE);
}
TabActivityPacs.layout.setVisibility(View.VISIBLE);
TabActivityPacs.expandedImageView
.setVisibility(View.GONE);
final Bitmap bitmap = (Bitmap) ((BitmapDrawable) ((ImageView) TabActivityPacs.expandedImageView)
.getDrawable()).getBitmap();
if (bitmap != null) {
ViewerActivity.sImage.setImageBitmap(bitmap);
} else {
ViewerActivity.sImage
.setImageResource(R.drawable.defaultimage);
}
TouchImageView.mCurrentAnimator = null;
}
@Override
public void onAnimationCancel(Animator animation) {
full_image.setAlpha(1f);
TabActivityPacs.tabs.setVisibility(View.VISIBLE);
TabActivityPacs.layout.setVisibility(View.VISIBLE);
TabActivityPacs.Tab_whole.setVisibility(View.VISIBLE);
if (Config.sUserType.equalsIgnoreCase("radiologist")) {
TabActivityPacs.recorder_Layout
.setVisibility(View.VISIBLE);
} else {
TabActivityPacs.playerloyout
.setVisibility(View.VISIBLE);
}
TabActivityPacs.expandedImageView
.setVisibility(View.GONE);
final Bitmap bitmap = (Bitmap) ((BitmapDrawable) ((ImageView) TabActivityPacs.expandedImageView)
.getDrawable()).getBitmap();
if (bitmap != null) {
ViewerActivity.sImage.setImageBitmap(bitmap);
} else {
ViewerActivity.sImage
.setImageResource(R.drawable.defaultimage);
}
TouchImageView.mCurrentAnimator = null;
}
});
set.start();
TouchImageView.mCurrentAnimator = set;
ViewerActivity.sHide = 0;
return true;
}
}
@Override
public boolean onDown(MotionEvent e) {
return false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
return false;
}
@Override
public void onLongPress(MotionEvent e) {
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
}
private void zoomImageFromThumb(final TouchImageView thumbView,
Bitmap imageResId) {
// If there's an animation in progress, cancel it
// immediately and proceed with this one.
if (mCurrentAnimator != null) {
mCurrentAnimator.cancel();
}
full_image = thumbView;
// Load the high-resolution "zoomed-in" image.
try {
if (imageResId != null) {
TabActivityPacs.expandedImageView.setImageBitmap(imageResId);
} else {
TabActivityPacs.expandedImageView
.setImageResource(R.drawable.defaultimage);
}
} catch (Exception exception) {
Log.d(null, " Error " + exception);
}
// Calculate the starting and ending bounds for the zoomed-in image.
// This step involves lots of math. Yay, math.
TouchImageView.startBounds = new Rect();
final Rect finalBounds = new Rect();
final Point globalOffset = new Point();
// The start bounds are the global visible rectangle of the thumbnail,
// and the final bounds are the global visible rectangle of the
// container
// view. Also set the container view's offset as the origin for the
// bounds, since that's the origin for the positioning animation
// properties (X, Y).
full_image.getGlobalVisibleRect(startBounds);
TabActivityPacs.host.getGlobalVisibleRect(finalBounds, globalOffset);
startBounds.offset(-globalOffset.x, -globalOffset.y);
finalBounds.offset(-globalOffset.x, -globalOffset.y);
// Adjust the start bounds to be the same aspect ratio as the final
// bounds using the "center crop" technique. This prevents undesirable
// stretching during the animation. Also calculate the start scaling
// factor (the end scaling factor is always 1.0).
float startScale;
if ((float) finalBounds.width() / finalBounds.height() > (float) startBounds
.width() / startBounds.height()) {
// Extend start bounds horizontally
startScale = (float) startBounds.height() / finalBounds.height();
float startWidth = startScale * finalBounds.width();
float deltaWidth = (startWidth - startBounds.width()) / 2;
startBounds.left -= deltaWidth;
startBounds.right += deltaWidth;
} else {
// Extend start bounds vertically
startScale = (float) startBounds.width() / finalBounds.width();
float startHeight = startScale * finalBounds.height();
float deltaHeight = (startHeight - startBounds.height()) / 2;
startBounds.top -= deltaHeight;
startBounds.bottom += deltaHeight;
}
// Hide the thumbnail and show the zoomed-in view. When the animation
// begins, it will position the zoomed-in view in the place of the
// thumbnail.
full_image.setAlpha(0f);
TabActivityPacs.expandedImageView.setVisibility(View.VISIBLE);
// Set the pivot point for SCALE_X and SCALE_Y transformations
// to the top-left corner of the zoomed-in view (the default
// is the center of the view).
TabActivityPacs.expandedImageView.setPivotX(0f);
TabActivityPacs.expandedImageView.setPivotY(0f);
// Construct and run the parallel animation of the four translation and
// scale properties (X, Y, SCALE_X, and SCALE_Y).
AnimatorSet set = new AnimatorSet();
set.play(
ObjectAnimator.ofFloat(TabActivityPacs.expandedImageView,
View.X, startBounds.left, finalBounds.left))
.with(ObjectAnimator.ofFloat(TabActivityPacs.expandedImageView,
View.Y, startBounds.top, finalBounds.top))
.with(ObjectAnimator.ofFloat(TabActivityPacs.expandedImageView,
View.SCALE_X, startScale, 1f))
.with(ObjectAnimator.ofFloat(TabActivityPacs.expandedImageView,
View.SCALE_Y, startScale, 1f));
set.setDuration(mShortAnimationDuration);
set.setInterpolator(new DecelerateInterpolator());
set.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mCurrentAnimator = null;
}
@Override
public void onAnimationCancel(Animator animation) {
mCurrentAnimator = null;
}
});
set.start();
mCurrentAnimator = set;
// Upon clicking the zoomed-in image, it should zoom back down
// to the original bounds and show the thumbnail instead of
// the expanded image.
startScaleFinal = startScale;
}
}