android开发笔记之PhotoView

参考资料

1.PhotoView
https://github.com/chrisbanes/PhotoView
2.android studio PhotoView配置与用法
http://blog.csdn.net/vc_bin/article/details/52549771
3.PhotoView开源项目剖析
http://blog.csdn.net/wu928320442/article/details/43056731

Features

1. Out of the box zooming, using multi-touch and double-tap.
2. Scrolling, with smooth scrolling fling.
3. Works perfectly when used in a scrolling parent (such as ViewPager).
4. Allows the application to be notified when the displayed Matrix has
   changed. Useful for when you need to update your UI based on the
   current zoom/scroll position.
5. Allows the application to be notified when the user taps on the
   Photo.

Demo

第一步：添加Dependency：

Add this in your root build.gradle file (not your module build.gradle file):

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

Then, add the library to your module build.gradle

dependencies {
    compile 'com.github.chrisbanes:PhotoView:2.0.0'
}

第二步：布局文件activity_test_photo_view.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_test_photo_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="android.com.debugdemo.TestPhotoView">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/image_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <com.github.chrisbanes.photoview.PhotoView
            android:id="@+id/photo_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/image_view"
            android:layout_marginTop="10dp"/>
    </RelativeLayout>

</ScrollView>

第三步：源码

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

import com.github.chrisbanes.photoview.PhotoView;

public class TestPhotoView extends AppCompatActivity {

    private ImageView image_view = null;
    private PhotoView photo_view = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_photo_view);
        init();
    }

    private void init() {
        image_view = (ImageView)findViewById(R.id.image_view);
        image_view.setImageResource(R.drawable.image);

        photo_view = (PhotoView)findViewById(R.id.photo_view);
        photo_view.setImageResource(R.drawable.image);
    }
}

效果图：

初始图：

双击后的效果图：

移动后的效果图：