add a BaseLazyFragment

README.md

@@ -1,5 +1,7 @@
 # SimpleNews
-基于Material Design和MVP的新闻客户端
+基于Material Design和MVP的新闻客户端，fork了之后我干了啥？
+* 修改部分MVP逻辑，完善可能造成内存泄露的代码。
+* 增添一个懒加载，让ViewPager+FragmentPagerAdapter的结合更加优雅。
 
 # Screenshot
 ###### 新闻列表
@@ -34,4 +36,4 @@ Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
-limitations under the License.
+limitations under the License.

app/src/main/java/com/lauren/simplenews/images/presenter/ImagePresenterImpl.java

@@ -41,4 +41,9 @@ public void onFailure(String msg, Exception e) {
         mImageView.hideProgress();
         mImageView.showLoadFailMsg();
     }
+
+    public void onDestroy() {
+        if (mImageView != null)
+            mImageView = null;
+    }
 }

app/src/main/java/com/lauren/simplenews/images/widget/ImageFragment.java

@@ -56,7 +56,7 @@ public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sa
                 R.color.accent);
         mSwipeRefreshWidget.setOnRefreshListener(this);
 
-        mRecyclerView = (RecyclerView)view.findViewById(R.id.recycle_view);
+        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycle_view);
         mRecyclerView.setHasFixedSize(true);
 
         mLayoutManager = new LinearLayoutManager(getActivity());
@@ -84,7 +84,7 @@ public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
         public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
             super.onScrollStateChanged(recyclerView, newState);
             if (newState == RecyclerView.SCROLL_STATE_IDLE
-                    && lastVisibleItem + 1 == mAdapter.getItemCount() ) {
+                    && lastVisibleItem + 1 == mAdapter.getItemCount()) {
                 //加载更多
                 Snackbar.make(getActivity().findViewById(R.id.drawer_layout), getString(R.string.image_hit), Snackbar.LENGTH_SHORT).show();
             }
@@ -93,15 +93,15 @@ public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
 
     @Override
     public void onRefresh() {
-        if(mData != null) {
+        if (mData != null) {
             mData.clear();
         }
         mImagePresenter.loadImageList();
     }
 
     @Override
     public void addImages(List<ImageBean> list) {
-        if(mData == null) {
+        if (mData == null) {
             mData = new ArrayList<ImageBean>();
         }
         mData.addAll(list);
@@ -123,4 +123,12 @@ public void showLoadFailMsg() {
         View view = getActivity() == null ? mRecyclerView.getRootView() : getActivity().findViewById(R.id.drawer_layout);
         Snackbar.make(view, getString(R.string.load_fail), Snackbar.LENGTH_SHORT).show();
     }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        if (mImagePresenter != null)
+            ((ImagePresenterImpl) mImagePresenter).onDestroy();
+        mImagePresenter = null;
+    }
 }

app/src/main/java/com/lauren/simplenews/main/presenter/MainPresenterImpl.java

@@ -2,6 +2,7 @@
 
 import com.lauren.simplenews.main.view.MainView;
 import com.lauren.simplenews.R;
+
 /**
  * Description :
  * Author : lauren
@@ -37,4 +38,9 @@ public void switchNavigation(int id) {
                 break;
         }
     }
+
+    public void onDestroy() {
+        if (mMainView != null)
+            mMainView = null;
+    }
 }

app/src/main/java/com/lauren/simplenews/main/widget/MainActivity.java

@@ -110,4 +110,13 @@ public void switch2About() {
         getSupportFragmentManager().beginTransaction().replace(R.id.frame_content, new AboutFragment()).commit();
         mToolbar.setTitle(R.string.navigation_about);
     }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        if (mMainPresenter != null)
+            ((MainPresenterImpl) mMainPresenter).onDestroy();
+        mMainPresenter = null;
+    }
+
 }

app/src/main/java/com/lauren/simplenews/news/presenter/NewsDetailPresenterImpl.java

@@ -35,7 +35,7 @@ public void loadNewsDetail(final String docId) {
 
     @Override
     public void onSuccess(NewsDetailBean newsDetailBean) {
-        if(newsDetailBean != null) {
+        if (newsDetailBean != null) {
             mNewsDetailView.showNewsDetialContent(newsDetailBean.getBody());
         }
         mNewsDetailView.hideProgress();
@@ -45,4 +45,9 @@ public void onSuccess(NewsDetailBean newsDetailBean) {
     public void onFailure(String msg, Exception e) {
         mNewsDetailView.hideProgress();
     }
+
+    public void onDestroy() {
+        if (mNewsDetailView != null)
+            mNewsDetailView = null;
+    }
 }

app/src/main/java/com/lauren/simplenews/news/presenter/NewsPresenterImpl.java

@@ -82,4 +82,9 @@ public void onFailure(String msg, Exception e) {
         mNewsView.hideProgress();
         mNewsView.showLoadFailMsg();
     }
+
+    public void onDestroy(){
+        if(mNewsView != null)
+            mNewsView = null;
+    }
 }

app/src/main/java/com/lauren/simplenews/news/widget/BaseLazyFragment.java

@@ -0,0 +1,107 @@
+package com.lauren.simplenews.news.widget;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+
+/**
+ * Created by Luo_xiasuhuei321@163.com on 2016/8/29.
+ *
+ * 实现懒加载的Fragment
+ */
+public abstract class BaseLazyFragment extends Fragment {
+
+    protected View mRootView;
+    protected Context mContext;
+    protected boolean isVisible;
+    private boolean isPrepared;
+    private boolean isFirst = true;
+
+    //--------------------system method callback------------------------//
+
+    @Override
+    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        isPrepared = true;
+        initPrepare();
+    }
+
+    @Override
+    public void setUserVisibleHint(boolean isVisibleToUser) {
+        super.setUserVisibleHint(isVisibleToUser);
+        if(getUserVisibleHint()){
+            isVisible = true;
+            lazyLoad();
+        }else{
+            isVisible = false;
+            onInvisible();
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        if(getUserVisibleHint()){
+            setUserVisibleHint(true);
+        }
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mContext = getActivity();
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+        if(mRootView == null){
+            mRootView = initView(inflater,container,savedInstanceState);
+        }
+
+        return mRootView;
+    }
+
+    //--------------------------------method---------------------------//
+
+    /**
+     * 懒加载
+     */
+    protected void lazyLoad(){
+        if(!isPrepared || !isVisible || !isFirst){
+            return;
+        }
+        initData();
+        isFirst = false;
+    }
+
+    //--------------------------abstract method------------------------//
+
+    /**
+     * 在onActivityCreated中调用的方法，可以用来进行初始化操作。
+     */
+    protected abstract void initPrepare();
+
+    /**
+     * fragment被设置为不可见时调用
+     */
+    protected abstract void onInvisible();
+
+    /**
+     * 这里获取数据，刷新界面
+     */
+    protected abstract void initData();
+
+    /**
+     * 初始化布局，请不要把耗时操作放在这个方法里，这个方法用来提供一个
+     * 基本的布局而非一个完整的布局，以免ViewPager预加载消耗大量的资源。
+     */
+    protected abstract View initView(LayoutInflater inflater,
+                                     @Nullable ViewGroup container,
+                                     @Nullable Bundle savedInstanceState);
+}

app/src/main/java/com/lauren/simplenews/news/widget/NewsDetailActivity.java

@@ -81,4 +81,12 @@ public void showProgress() {
     public void hideProgress() {
         mProgressBar.setVisibility(View.GONE);
     }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        if(mNewsDetailPresenter != null)
+            ((NewsDetailPresenterImpl)mNewsDetailPresenter).onDestroy();
+        mNewsDetailPresenter = null;
+    }
 }