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Android手势控制实现缩放、移动图片

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这篇文章主要为大家详细介绍了Android手势控制实现缩放、移动图片，感兴趣的小伙伴们可以参考一下

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);
  }
 
 
}

 

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>

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());

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。