最近在知乎上看到一篇很不錯的分享,關於Fragment的一些用法和開發經驗,其中提倡用全屏的DialogFragment代替Activity處理一些特殊的場景,比如用戶點擊item觸發打開一些內容詳情頁,相冊點擊小圖片時會將圖片全屏放大展示…等等的這些場景都可以考慮用全屏的DialogFragment來代替Activity來代替進行視圖的展示。
由於具體的代碼邏輯非常簡單,我就直接上代碼了,註釋也寫得很清楚,你肯定能看懂:
public class FullScreenDlgFragment extends DialogFragment implements View.OnClickListener{
private int mClickItem;//對應顯示ViewPager子項的位置
private List<String> mListImgUrls;
private ViewPager mViewPager;
private Integer[] mImgIds;//本地圖片資源ID
private Dialog mDialog;
public static final String TAG_NAME=AlertDlgFragment.class.getName();
private Context mContext;
//即學即用的工廠方法
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來響應點擊
@Override
public void onClick(View v) {
this.dismiss();
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
//設置Dialog樣式
setStyle(DialogFragment.STYLE_NORMAL, R.style.CustomDialog_fill);
mDialog=new Dialog(mContext);
//去標題欄
mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
initView();
return mDialog;
}
private void initView() {
//將Dialog設置全屏!!!
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]);
// 加載網絡圖片
// 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>
具體使用只需:
FullScreenDlgFragment.newInstance(this,new Integer[]{R.mipmap.p1,R.mipmap.p2,R.mipmap.p3,R.mipmap.p4},2).show(getFragmentManager(),AlertDlgFragment.TAG_NAME);
特別鳴謝,以下兩篇文章:
【乾貨】Dialog的高冷用法
麪條在知乎上“關於 Android,用多個 activity,還是單 activity 配合 fragment?”的回答