用全屏DialogFragment代替Activity，结合ViewPager展示图片

最近在知乎上看到一篇很不错的分享，关于Fragment的一些用法和开发经验，其中提倡用全屏的DialogFragment代替Activity处理一些特殊的场景，比如用户点击item触发打开一些内容详情页，相册点击小图片时会将图片全屏放大展示…等等的这些场景都可以考虑用全屏的DialogFragment来代替Activity来代替进行视图的展示。

由于具体的代码逻辑非常简单，我就直接上代码了，注释也写得很清楚，你肯定能看懂：

public class FullScreenDlgFragment extends DialogFragment implements View.OnClickListener{    private int mClickItem;//对应显示ViewPager子项的位置    private List<String> mListImgUrls;    private ViewPager mViewPager;    private Integer[] mImgIds;//本地图片资源ID    private Dialog mDialog;    public static final String TAG_NAME=AlertDlgFragment.class.getName();    private Context mContext;    //即学即用的工厂方法    public static FullScreenDlgFragment newInstance(Context context, Integer[] imgIds, int clickItem) {        Bundle args = new Bundle();        FullScreenDlgFragment fragment = new FullScreenDlgFragment();        fragment.setArguments(args);        fragment.mContext = context;        fragment.mImgIds = imgIds;        fragment.mClickItem = clickItem;        return fragment;    }      //由ViewPager来响应点击    @Override    public void onClick(View v) {        this.dismiss();    }    @Override    public Dialog onCreateDialog(Bundle savedInstanceState) {        //设置Dialog样式        setStyle(DialogFragment.STYLE_NORMAL, R.style.CustomDialog_fill);        mDialog=new Dialog(mContext);        //去标题栏        mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);        initView();        return mDialog;    }    private void initView() {        //将Dialog设置全屏！！！        setDlgParams();        mViewPager = new ViewPager(mContext);        ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,                ViewGroup.LayoutParams.MATCH_PARENT);        mViewPager.setLayoutParams(params);        mViewPager.setBackgroundColor(0xFF000000);        initViewPager();        mDialog.setContentView(mViewPager);    }    private void setDlgParams() {        ViewGroup.LayoutParams lay = mDialog.getWindow().getAttributes();        DisplayMetrics dm = new DisplayMetrics();        mDialog.getWindow().getWindowManager().getDefaultDisplay().getMetrics(dm);        Rect rect = new Rect();        View view = mDialog.getWindow().getDecorView();        view.getWindowVisibleDisplayFrame(rect);        lay.height = dm.heightPixels - rect.top;        lay.width = dm.widthPixels;    }    private void initViewPager() {        if (mImgIds != null && mImgIds.length > 0) {            List<View> listImgs = new ArrayList<>();            for (int i = 0; i < mImgIds.length; i++) {                ImageView iv = new ImageView(mContext);                ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(                        ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);                iv.setLayoutParams(params);                listImgs.add(iv);                iv.setOnClickListener(this);                iv.setImageResource(mImgIds[i]);                // 加载网络图片                // BitmapHelper.getInstance(mContext).display(iv,                // mListImgUrls.get(i));            }            if (listImgs.size() > 0) {                MyPagerAdapter pageAdapter = new MyPagerAdapter(listImgs);                mViewPager.setAdapter(pageAdapter);                mViewPager.setCurrentItem(mClickItem);            }        }    }}

styles.xml

<style name="CustomDialog_fill" parent="Theme.AppCompat.Dialog">    <item name="android:windowNoTitle">true</item>    <item name="android:windowFrame">@null</item>    <item name="android:windowIsFloating">true</item>    <item name="android:windowIsTranslucent">true</item>    <item name="android:backgroundDimEnabled">false</item>    <item name="android:windowBackground">@android:color/white</item></style>

具体使用只需：

FullScreenDlgFragment.newInstance(this,new Integer[]{R.mipmap.p1,R.mipmap.p2,R.mipmap.p3,R.mipmap.p4},2).show(getFragmentManager(),AlertDlgFragment.TAG_NAME);

特别鸣谢，以下两篇文章：
【干货】Dialog的高冷用法
面条在知乎上“关于 Android，用多个 activity，还是单 activity 配合 fragment？”的回答