Android手势滑动实现两点触摸缩放图片
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2021-01-20
09:09:47
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Android手势滑动实现两点触摸缩放图片手势滑动实现两点触摸缩放图片
学习安卓手势滑动，多点触摸放大缩小图片，分享给大家供大家参考，具体代码如下
1.布局文件如下布局文件如下main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<!-- 引用自定义控件 -->
<com.ymw.zoomimage.ZoomImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</com.ymw.zoomimage.ZoomImageView>
</LinearLayout>
2.自定义缩放图片控件自定义缩放图片控件ZoomImageView.java代码：代码：
package com.ymw.zoomimage;
import java.util.Observable;
import java.util.Observer;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class ZoomImageView extends View implements Observer {
/** Paint object used when drawing bitmap. */
private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
/** Rectangle used (and re-used) for cropping source image. */
private final Rect mRectSrc = new Rect();
/** Rectangle used (and re-used) for specifying drawing area on canvas. */
private final Rect mRectDst = new Rect();
/** Object holding aspect quotient */
private final AspectQuotient mAspectQuotient = new AspectQuotient();
/** The bitmap that we're zooming in, and drawing on the screen. */
private Bitmap mBitmap;
/** State of the zoom. */
private ZoomState mState;
private BasicZoomControl mZoomControl;
private BasicZoomListener mZoomListener;
public ZoomImageView(Context context, AttributeSet attrs) {
super(context, attrs);
mZoomControl = new BasicZoomControl();
mZoomListener = new BasicZoomListener();
mZoomListener.setZoomControl(mZoomControl);
setZoomState(mZoomControl.getZoomState());
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