PhotoView 图片缩放功能

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Android 图片浏览功能图片放大缩小，使用 photoview 双击或双指缩放的ImageView，使用多点触控和双击。滚动，以平滑滚动甩。

首先去github网站上去下载网址：https://github.com/chrisbanes/PhotoView

我用的Studio写的用eclipse的可以下载库文件，然后依赖库文件即可

把这个放到根目录 build.gradle

allprojects {    repositories {        ...        maven { url "https://jitpack.io" }    }}

把这个放到你项目app下面的 build.gradle

dependencies {    compile 'com.github.chrisbanes:PhotoView:1.3.0'}

具体代码如下：

package ti.potoviewdemo;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public  void click(View v){//跳转页面  缩放图片        startActivity(new Intent(MainActivity.this,Photo.class));            }}

package ti.potoviewdemo;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.util.Log;import android.view.Display;import android.view.WindowManager;import android.widget.ImageView;import android.widget.RelativeLayout;import butterknife.ButterKnife;import butterknife.InjectView;import uk.co.senab.photoview.PhotoViewAttacher;/** * Created by ti on 2016/9/15. */public class Photo extends Activity {    private static final String TAG = "Photo";    @InjectView(R.id.iv)    ImageView iv;    private BitmapFactory.Options options;    private Bitmap bitmap;    private WindowManager windowManager;    private Display display;    private PhotoViewAttacher attacher;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_photo);        ButterKnife.inject(this);        attacher = new PhotoViewAttacher(iv);    }    private void compress() {//压缩图片        //拿到图片        bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.yang);        //测量        options = new BitmapFactory.Options();        options.inJustDecodeBounds=true;//只测量        float height=bitmap.getHeight();        float width=bitmap.getWidth();        windowManager = getWindowManager();        display = windowManager.getDefaultDisplay();        float screenWidth=display.getWidth();        float scale=screenWidth/width;        if(scale==0){            scale=1;        }        int dispHeiggt= (int) (height*scale);        Log.e(TAG, "compress: "+dispHeiggt );        RelativeLayout.LayoutParams layoutParams=new RelativeLayout.LayoutParams((int) screenWidth,dispHeiggt);        iv.setLayoutParams(layoutParams);    }}

把这个放到你项目的根目录中去 build.gradle

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