学习目的：制作简易版新闻应用
1.为RecycleView添加依赖
1 | compile 'com.android.support:recyclerview-v7:24.2.1' |
2.新建News类1
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23public class News {
private String title;
private String content;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
3.新建布局news_content_frag1
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41<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/visibility_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:visibility="invisible" >
<TextView
android:id="@+id/news_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="10dp"
android:textSize="20sp" />
<View//分割线
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000" />
<TextView
android:id="@+id/news_content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:padding="15dp"
android:textSize="18sp" />
</LinearLayout>
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:background="#000" />
</RelativeLayout>
4.新建NewsContentFragment //加载布局 套路1
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21public class NewsContentFragment extends Fragment {
private View view;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.news_content_frag, container, false);//R.layout 布局文件
return view;
}
public void refresh(String newsTitle, String newsContent) {
View visibilityLayout = view.findViewById(R.id.visibility_layout);//R.id 布局文件中的子布局 如LinerLayout
visibilityLayout.setVisibility(View.VISIBLE);
TextView newsTitleText = (TextView) view.findViewById (R.id.news_title);
TextView newsContentText = (TextView) view.findViewById(R.id.news_content);
newsTitleText.setText(newsTitle); // 刷新新闻的标题
newsContentText.setText(newsContent); // 刷新新闻的内容
}
}
5.新建newsContentAcyivity及其布局文件news_content
news_content
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6<fragment
android:id="@+id/news_content_fragment"
android:name="com.example.fragmentbestpractice.NewsContentFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>NewsContentActivity类
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public class NewsContentActivity extends AppCompatActivity {
public static void actionStart(Context context, String newsTitle, String newsContent) {//启动活动的最佳写法
Intent intent = new Intent(context, NewsContentActivity.class);
intent.putExtra("news_title", newsTitle);
intent.putExtra("news_content", newsContent);
context.startActivity(intent);
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_content);
String newsTitle = getIntent().getStringExtra("news_title"); // 获取传入的新闻标题
String newsContent = getIntent().getStringExtra("news_content"); // 获取传入的新闻内容
NewsContentFragment newsContentFragment = (NewsContentFragment)getSupportFragmentManager().findFragmentById(R.id.news_content_fragment);
newsContentFragment.refresh(newsTitle, newsContent); // 刷新NewsContentFragment界面
}
}
```
<h3>6.新建layout-sw600dp文件夹 新建activity_main文件</h3>
- 双页
```java
<fragment
android:id="@+id/news_title_fragment"
android:name="com.example.fragmentbestpractice.NewsTitleFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1" />
<FrameLayout
android:id="@+id/news_content_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3" >
<fragment
android:id="@+id/news_content_fragment"
android:name="com.example.fragmentbestpractice.NewsContentFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
```
<h3>7.在NewsTitleFragment类中新建RecyclerView的适配器内部类NewsAdaper</h3>
- 适配器代码千篇一律，只是参数有变化
```java
class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder> {
private List<News> mNewsList;
class ViewHolder extends RecyclerView.ViewHolder {
TextView newsTitleText;
public ViewHolder(View view) {
super(view);
newsTitleText = (TextView) view.findViewById(R.id.news_title);
}
}
public NewsAdapter(List<News> newsList) {
mNewsList = newsList;
}
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_item, parent, false);
final ViewHolder holder = new ViewHolder(view);
view.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
News news = mNewsList.get(holder.getAdapterPosition());
if (isTwoPane) {
NewsContentFragment newsContentFragment = (NewsContentFragment)
getFragmentManager().findFragmentById(R.id.news_content_fragment);
newsContentFragment.refresh(news.getTitle(), news.getContent());
} else {
NewsContentActivity.actionStart(getActivity(), news.getTitle(), news.getContent());
}
}
});
return holder;
}
public void onBindViewHolder(ViewHolder holder, int position) {
News news = mNewsList.get(position);
holder.newsTitleText.setText(news.getTitle());
}
public int getItemCount() {
return mNewsList.size();
}
}
}
8.NewsTitleFragment类
1 | public class NewsTitleFragment extends Fragment { |