本文实例为大家分享了android手势控制实现缩放、移动图片的方法，供大家参考，具体内容如下
新建一个触摸监听器类
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package com.liyong.btprinter;
import android.graphics.matrix;
import android.graphics.pointf;
import android.util.floatmath;
import android.view.motionevent;
import android.view.view;
import android.view.view.ontouchlistener;
import android.widget.imageview;
public class mulitpointtouchlistener implements ontouchlistener {
private static final string tag = "touch";
// 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 boolean ontouch(view v, motionevent event) {
imageview view = (imageview) v;
// log.e("view_width",
// view.getimagematrix()..tostring()+"*"+v.getwidth());
// dump touch event to log
dumpevent(event);
// handle touch events here...
switch (event.getaction() & motionevent.action_mask) {
case motionevent.action_down:
matrix.set(view.getimagematrix());
savedmatrix.set(matrix);
start.set(event.getx(), event.gety());
//log.d(tag, "mode=drag");
mode = drag;
//log.d(tag, "mode=none");
break;
case motionevent.action_pointer_down:
olddist = spacing(event);
//log.d(tag, "olddist=" + olddist);
if (olddist > 10f) {
savedmatrix.set(matrix);
midpoint(mid, event);
mode = zoom;
//log.d(tag, "mode=zoom");
}
break;
case motionevent.action_up:
case motionevent.action_pointer_up:
mode = none;
//log.e("view.getwidth", view.getwidth() + "");
//log.e("view.getheight", view.getheight() + "");
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);
//log.d(tag, "newdist=" + newdist);
if (newdist > 10f) {
matrix.set(savedmatrix);
float scale = newdist / olddist;
matrix.postscale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setimagematrix(matrix);
return true; // indicate event was handled
}
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());
}
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);
}
}
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编写一个xml文件
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<?xml version="1.0" encoding="utf-8"?>
<linearlayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:id="@+id/linearlayout1"
android:weightsum="1">
<imageview android:layout_width="fill_parent"
android:id="@+id/priviewimage"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:scaletype="matrix"
>
</imageview>
</linearlayout>
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注意其中的: android:scaletype="matrix"
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priviewimage.setimagebitmap(activitypreviewimage.click_bitmap);
priviewimage=(imageview)findviewbyid(r.id.priviewimage);
priviewimage.setontouchlistener(new mulitpointtouchlistener());
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以上就是android手势控制缩放移动图片的全部代码，希望对大家的学习有所帮助。