第三方开源库：PhotoView-master实现缩放的效果

github地址：https://github.com/chrisbanes/PhotoView

Demo源码：http://download.csdn.net/detail/ss1168805219/9495455

本Demo是仿照github simple写的。

本Demo需要添加2个依赖库：

           1 PhotoView

           2 Picasso:在PicassoActivity.class中用，实现网络图片的加载

类：

MainActivity：  主界面

SimpleActivity：实现简单的缩放

ViewPagerActivity：在viewpaper中实现缩放

                            HackyViewPager：避免使用viewpaper出现的bug： pointerIndex out of range

RatationActivity：实现图片的旋转

PicassoActivity：加载网路图片实现缩放

 

添加依赖库：

compile 'com.github.chrisbanes.photoview:library:1.2.4'

compile 'com.squareup.picasso:picasso:2.5.2'

readMe：中是这样天剑依赖的，我没采用：

 

activity_main.xml：4个textview 竖直排列，都设置了点击事件的监听

MainActivity

public class MainActivity extends Activity {//AppCompatActivity
    public Context context;
    private TextView tv1;
    private TextView tv2;
    private TextView tv3;
    private TextView tv4;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = this;

        initTV1();//普通的放缩

        initTV2();//viewpaper中的放缩

        initTV3();//旋转

        initTV4();//加载网络图片
    }

    private void initTV1() {
        tv1 = (TextView) findViewById(R.id.tv1);
        tv1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(context, SimpleActivity.class);
                startActivity(intent);
            }
        });
    }

    private void initTV2() {
        tv2 = (TextView) findViewById(R.id.tv2);
        tv2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(context, ViewPagerActivity.class);
                startActivity(intent);
            }
        });
    }

    private void initTV3() {
        tv3 = (TextView) findViewById(R.id.tv3);
        tv3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(context, RatationActivity.class);
                startActivity(intent);
            }
        });
    }


    private void initTV4() {
        tv4 = (TextView) findViewById(R.id.tv4);
        tv4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(context, PicassoActivity.class);
                startActivity(intent);
            }
        });
    }

}

 

SimpleActivity：

activity_simple.xml:

 

SimpleActivity.class

public class SimpleActivity  extends Activity {//AppCompatActivity

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

        ImageView imageView = (ImageView) findViewById(R.id.imageView);
        Drawable drawable = getResources().getDrawable(R.drawable.wallpaper);
        imageView.setImageDrawable(drawable);
        //布局中字节用PhotoView就不需要下面这2行了
        PhotoViewAttacher attacher = new PhotoViewAttacher(imageView);
        attacher.update();
    }
}

 

 

ViewPagerActivity:

activity_viewpager.xml

ViewPagerActivity.class

public class ViewPagerActivity  extends AppCompatActivity{

    private ArrayList list;

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

        initList();
        //用viewpaper可能会出现pointerIndex out of range，我运行出现了，
        HackyViewPager viewpager = (HackyViewPager) findViewById(R.id.viewpager);
        viewpager.setAdapter(new MyAdapter());
    }

    private void initList() {
        list = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            list.add(R.drawable.wallpaper);
        }
    }

    class MyAdapter extends PagerAdapter{


        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            PhotoView photoView = new PhotoView(container.getContext());
            photoView.setImageResource(list.get(position));
            //用PhotoView就不需要下面这2行了
//            PhotoViewAttacher attacher = new PhotoViewAttacher(photoView);
//            attacher.update();
            container.addView(photoView);

            return photoView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View)object);
        }
    }
}

 

 

 

RatationActivity:直接copy的sample

public class RatationActivity  extends AppCompatActivity{

    private PhotoView photo;
    private final Handler handler = new Handler();
    private boolean rotating = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        photo = new PhotoView(this);
        photo.setImageResource(R.drawable.wallpaper);
        setContentView(photo);

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(Menu.NONE, 0, Menu.NONE, "Rotate 10° Right");
        menu.add(Menu.NONE, 1, Menu.NONE, "Rotate 10° Left");
        menu.add(Menu.NONE, 2, Menu.NONE, "Toggle automatic rotation");
        menu.add(Menu.NONE, 3, Menu.NONE, "Reset to 0");
        menu.add(Menu.NONE, 4, Menu.NONE, "Reset to 90");
        menu.add(Menu.NONE, 5, Menu.NONE, "Reset to 180");
        menu.add(Menu.NONE, 6, Menu.NONE, "Reset to 270");
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case 0:
                photo.setRotationBy(10);
                return true;
            case 1:
                photo.setRotationBy(-10);
                return true;
            case 2:
                toggleRotation();
                return true;
            case 3:
                photo.setRotationTo(0);
                return true;
            case 4:
                photo.setRotationTo(90);
                return true;
            case 5:
                photo.setRotationTo(180);
                return true;
            case 6:
                photo.setRotationTo(270);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }



    private void toggleRotation() {
        if (rotating) {
            handler.removeCallbacksAndMessages(null);
        } else {
            rotateLoop();
        }
        rotating = !rotating;
    }

    private void rotateLoop() {
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                photo.setRotationBy(1);
                rotateLoop();
            }
        }, 15);
    }
}

 

 

PicassoActivity：

public class PicassoActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        PhotoView photoView = new PhotoView(this);
        /**
         *  使用Picasso需要导包：com.squareup.picasso.Picasso;
         *
         */
        Picasso.with(this)
                .load("http://i2.sinaimg.cn/gm/2013/0312/U3077P115DT20130312165529.jpg")//注意加权限
                .into(photoView);//作用于哪个view
        setContentView(photoView);
    }
}