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Copy pathImageViewOnMultiTouchListener.java
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124 lines (92 loc) · 2.8 KB
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package com.view.ui;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
public class ImageViewOnMultiTouchListener implements View.OnTouchListener {
private final int NONE = 0;
private final int MOVE = 1;
private final int ZOOM = 2;
private final int DRAG = 3;
private int mode = NONE;
private Matrix matrix = new Matrix();
private Matrix savedMatrix = new Matrix();
private PointF start = new PointF();
private PointF mid = new PointF();
private float oldDistance = 0;
float oldRotation = 0;
private boolean canRotate = false;
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
matrix.set(view.getImageMatrix());
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDistance = spacing(event);
oldRotation = rotation(event);
if (oldDistance > 5f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY()
- start.y);
} else if (mode == ZOOM) {
float newDist = spacing(event);
//注释了旋转的功能
if (newDist > 5f) {
matrix.set(savedMatrix);
float scale = newDist / oldDistance;
float rotation = rotation(event) - oldRotation;
matrix.postScale(scale, scale, mid.x, mid.y);
if (isCanRotate()) {
matrix.postRotate(rotation, mid.x, mid.y);// 旋轉
}
}
}
break;
}
view.setImageMatrix(matrix);
view.setScaleType(ImageView.ScaleType.MATRIX);
view.setPadding(3, 5, 3, 5);
return true;
}
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);
}
public boolean isCanRotate() {
return canRotate;
}
public void setCanRotate(boolean canRotate) {
this.canRotate = canRotate;
}
// 取旋转角度
private float rotation(MotionEvent event) {
double delta_x = (event.getX(0) - event.getX(1));
double delta_y = (event.getY(0) - event.getY(1));
double radians = Math.atan2(delta_y, delta_x);
return (float) Math.toDegrees(radians);
}
}