【android】可放大缩小图片位置点击位置获取

直接上代码。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >     <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:text="Button" />    <HorizontalScrollView        android:id="@+id/horizontalScrollView1"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:layout_above="@+id/button1"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true" >            <ScrollView                android:id="@+id/scrollView1"                android:layout_width="fill_parent"                android:layout_height="fill_parent"                 >                <ImageView                 android:id="@+id/imageView1"                android:layout_width="fill_parent"                android:layout_height="fill_parent"                 android:src="@drawable/campus_map"  />            </ScrollView>    </HorizontalScrollView> </RelativeLayout>

在imageview外层加上ScrollView和HorizontalScrollView主要是为了图片在放大的时候使用，

package com.example.test;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Matrix;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.widget.Button;import android.widget.ImageView;import android.widget.ScrollView;public class MainActivity extends Activity  {private Button b;private ImageView imageView;private Matrix mMatrix;private Bitmap bmp;    private float scaleWidth=1;      private float scaleHeight=1;    private  int i = 0;    private ScrollView scrollView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                b = (Button) this.findViewById(R.id.button1);                         mMatrix = new Matrix();         imageView = (ImageView) findViewById(R.id.imageView1);        bmp = ((BitmapDrawable) getResources().getDrawable(                 R.drawable.campus_map)).getBitmap();        scrollView = (ScrollView) this.findViewById(R.id.scrollView1);                //        button是放大作用，图片每次放大1.25倍。        b.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub//mMatrix.setRotate(90);//        mMatrix.setScale(100f/bmp.getWidth(), 100f/bmp.getHeight());   //        Bitmap bm = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), //                bmp.getHeight(), mMatrix, true);//        imageView.setImageBitmap(bm);//        double scale=1.25;          /* 计算这次要放大的比例 */          scaleWidth=(float)(scaleWidth*scale);          scaleHeight=(float)(scaleHeight*scale);          /* 产生reSize后的Bitmap对象 */          Matrix matrix = new Matrix();          matrix.postScale(scaleWidth, scaleHeight);                   Bitmap resizeBmp = Bitmap.createBitmap(bmp,0,0,bmp.getWidth(),                   bmp.getHeight(),matrix,true);        imageView.setImageBitmap(resizeBmp);         //      }});        //        获取imageview点击处的位置。        imageView.setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubSystem.out.println("当前获取位置："+event.getX()+"   "+event.getY());return false;}});        //        Random r = new Random();//        mMatrix.setRotate(90);//        mMatrix.setScale(100f/bmp.getWidth(), 100f/bmp.getHeight()); //        mMatrix.postSkew(0.3f, 0.7f);        mMatrix.setTranslate(bmp.getWidth(), bmp.getHeight());        Bitmap bm = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(),                 bmp.getHeight(), mMatrix, true);        imageView.setImageBitmap(bm);         System.out.println("pppp");        /*mMatrix.setRotate(90);        mMatrix.setScale(100f/bmp.getWidth(), 100f/bmp.getHeight());           Bitmap bm = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(),                 bmp.getHeight(), mMatrix, true);        imageView.setImageBitmap(bm); */    }//    使用activity的onTouch方法是无效的，只能使用dispatchTouchEvent@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {// TODO Auto-generated method stubif(ev.getAction()==MotionEvent.ACTION_DOWN){System.out.println("imageview屏幕大小:"+imageView.getWidth()+" "+imageView.getHeight());////System.out.println(imageView.getHorizontalFadingEdgeLength());//System.out.println(imageView.getVerticalFadingEdgeLength());}return super.dispatchTouchEvent(ev);}}

地图

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