基于ViewPager的相册查看器

对于很多应用而言，一个少不了的功能就是相册的查看，但是有没有一个封装好了的相册处理页面呢？接下来就来介绍我的相册查看器。

基于ViewPager的实现，是一个单独的Activity，只需传入存放图片的集合就行，这里通过intent的传递数据：pictureUrls = (ArrayList<String>) b.getSerializable("info");然后就是照片的位置，默认是第零个位置:currentPosition=intent.getIntExtra("position",0);接下来就是添加到viewpager当中了。直接上代码，粘贴复制到自己项目修改一下下就可以使用了。

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import com.bumptech.glide.Glide;import java.util.ArrayList;public class ViewPagerActivity extends Activity {    PRivate ViewPager mPager;    private ArrayList<String> pictureUrls = new ArrayList<>();    private TextView text_button;    private int currentPosition=0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_view_pager);        text_button = (TextView) findViewById(R.id.text_button);        Intent intent = getIntent();        if (!intent.equals(null)) {            Bundle b = intent.getExtras();            if (b != null) {                if (b.containsKey("info")) {                    pictureUrls = (ArrayList<String>) b.getSerializable("info");                }            }        }        if (intent.hasExtra("position")){            currentPosition=intent.getIntExtra("position",0);        }        text_button.setText(1+"/"+pictureUrls.size());        mPager = (ViewPager) findViewById(R.id.pager);        mPager.setPageMargin((int) (getResources().getDisplayMetrics().density * 15));        mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                text_button.setText((position+1)+"/"+pictureUrls.size());            }            @Override            public void onPageScrollStateChanged(int state) {            }        });        mPager.setAdapter(new PagerAdapter() {            @Override            public int getCount() {                return pictureUrls.size();            }            @Override            public boolean isViewFromObject(View view, Object object) {                return view == object;            }            @Override            public Object instantiateItem(ViewGroup container, int position) {                PhotoView view = new PhotoView(ViewPagerActivity.this);                view.enable();                view.setScaleType(ImageView.ScaleType.FIT_CENTER);//                text_button.setText(position+"/"+pictureUrls.size());                Glide.with(ViewPagerActivity.this).load(pictureUrls.get(position)).into(view);//                view.setImageResource(pictureUrls[position]);                container.addView(view);                view.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        ViewPagerActivity.this.finish();                    }                });                return view;            }            @Override            public void destroyItem(ViewGroup container, int position, Object object) {                container.removeView((View) object);            }        });        mPager.setCurrentItem(currentPosition);    }}期间用了glide来添加图片，这个自行调整，如不需要也可以换用别的。照片查看当中可以左右滑动，也有下标，点击照片退回原位置。
xml布局：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#000"    >    <android.support.v4.view.ViewPager        android:id="@+id/pager"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="40dp"        android:layout_marginBottom="40dp"/>    <TextView        android:id="@+id/text_button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="1/10"        android:textColor="#fff"        android:textSize="14sp"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="15dp"/>    <TextView        android:id="@+id/delete_photo"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_marginBottom="15dp"        android:layout_alignParentRight="true"        android:paddingLeft="40dp"        android:paddingTop="5dp"        android:paddingRight="30dp"        android:text="删除"        android:textSize="14sp"        android:textColor="#ffffff"        android:visibility="gone"/></RelativeLayout>