添加快速返回顶部

Author: GcsSloop

diycode-app/src/main/java/com/gcssloop/diycode/activity/MainActivity.java

@@ -62,7 +62,10 @@ public class MainActivity extends BaseActivity
         implements NavigationView.OnNavigationItemSelectedListener {
     private DataCache mCache;
     private Config mConfig;
-    private int mCurrentPosition = -1;
+    private int mCurrentPosition = 0;
+    TopicListFragment mFragment1;
+    NewsListFragment mFragment2;
+    SitesListFragment mFragment3;
 
     @Override
     public int getLayoutId() {
@@ -85,9 +88,9 @@ private void initViewPager(ViewHolder holder) {
         TabLayout mTabLayout = holder.get(R.id.tab_layout);
         mViewPager.setOffscreenPageLimit(1); // 防止滑动到第三个页面时，第一个页面被销毁
 
-        final TopicListFragment mFragment1 = TopicListFragment.newInstance();
-        final NewsListFragment mFragment2 = NewsListFragment.newInstance();
-        final SitesListFragment mFragment3 = SitesListFragment.newInstance();
+        mFragment1 = TopicListFragment.newInstance();
+        mFragment2 = NewsListFragment.newInstance();
+        mFragment3 = SitesListFragment.newInstance();
 
         mViewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
             String[] types = {"Topics", "News", "Sites"};
@@ -131,8 +134,8 @@ public void onPageScrollStateChanged(int state) {
             }
         });
 
-        int lastPosition = mConfig.getMainViewPagerPosition();
-        mViewPager.setCurrentItem(lastPosition);
+        mCurrentPosition = mConfig.getMainViewPagerPosition();
+        mViewPager.setCurrentItem(mCurrentPosition);
 
         mTabLayout.setupWithViewPager(mViewPager);
     }
@@ -270,6 +273,13 @@ public boolean onOptionsItemSelected(MenuItem item) {
                 openActivity(NotificationActivity.class);
             }
             return true;
+        } else if (id == R.id.action_quick_to_top){
+            Logger.e("点击返回头部"+mCurrentPosition);
+            switch (mCurrentPosition){
+                case 0:
+                    mFragment1.quickToTop();
+                    break;
+            }
         }
 
         return super.onOptionsItemSelected(item);

diycode-app/src/main/java/com/gcssloop/diycode/fragment/NewsListFragment.java

@@ -111,6 +111,7 @@ protected int getLayoutId() {
     }
 
     private void loadData() {
+        mRefreshLayout.setEnabled(true);
         // 第一次加载，默认从缓存加载
         List<New> news = mDataCache.getNewsList();
         if (null != news && news.size() > 0) {

diycode-app/src/main/java/com/gcssloop/diycode/fragment/TopicListFragment.java

@@ -291,6 +291,7 @@ public void onDestroyView() {
     }
 
     public void quickToTop() {
+        Logger.e("快速返回");
         if (mScrollView != null) {
             mScrollView.smoothScrollTo(0, 0);
         }

diycode-app/src/main/res/menu/main.xml

@@ -23,11 +23,16 @@
 
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/action_quick_to_top"
+        android:icon="@mipmap/up"
+        android:title="快速返回"
+        app:showAsAction="always"/>
     <item
         android:id="@+id/action_notification"
         android:icon="@mipmap/notification"
         android:title="通知"
-        app:showAsAction="ifRoom"/>
+        app:showAsAction="always"/>
     <item
         android:id="@+id/action_settings"
         android:orderInCategory="100"