美文网首页
Andorid 获取数据并填充到View

Andorid 获取数据并填充到View

作者: 小小_糊涂虫 | 来源:发表于2018-03-27 21:17 被阅读0次

    Andorid 获取数据并填充到View

    背景

    在上次的博客中,进行了登录请求的实现,实现了客户端与服务端的交互并向服务端提交数据。这次就想着从服务端获取数据,并将数据展示在页面中。

    构思

    根据自己工作中遇到的的接口,很多都返回一个list。就想试着写一个页面来承载这些数据。根据看《Android第一行代码》看到RecycleView能够满足改需求。所以决定在上一次的代码基础上再加一个activity。

    操作

    1. 查看数据返回构造响应的数据结构。因为在开发代码中已经有了对应的代码,所以我就直接进行了拷贝,省去写代码的时间。
    2. 编写布局文件,
    • 整个布局文件activity_my_article.xml如下:
    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent" android:layout_height="match_parent">
       <!--android:background="0x7f0801a2">-->
       <android.support.design.widget.AppBarLayout
           android:layout_width="match_parent"
           android:layout_height="wrap_content">
           <android.support.v7.widget.Toolbar
               android:id="@+id/toolbar"
               android:layout_width="match_parent"
               android:layout_height="?attr/actionBarSize"
               android:background="?attr/colorPrimary"
               app:layout_scrollFlags="scroll|exitUntilCollapsed"/>
       </android.support.design.widget.AppBarLayout>
       <android.support.v7.widget.RecyclerView
           android:id="@+id/recycler_view"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           app:layout_behavior="@string/appbar_scrolling_view_behavior" />
    </android.support.design.widget.CoordinatorLayout>
    

    主要用到的布局控件:RecyclerView、Toolbar、CoordinatorLayout、AppBarLayout。Toolbar、CoordinatorLayout、AppBarLayout的介绍的文章,这里给出一篇介绍。关于RecyclerView的介绍网上资料也是比较多的,这里就不给了。

    • 各个item布局 item.xml
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:id="@+id/item_layout">
    
     <TextView
         android:lineSpacingExtra="0dp"
         android:textSize="20sp"
         android:ellipsize="end"
         android:layout_margin="20dp"
         android:layout_height="wrap_content"
         tools:text="文章标题文章标题文章标题文章标题文章标题"
         android:includeFontPadding="false"
         android:lineSpacingMultiplier="1.2"
         android:gravity="top"
         android:layout_width="match_parent"
         android:id="@+id/my_article_item_title_txt"
         android:maxLines="2"
         android:textColor="#333333"
         >
     </TextView>
    </LinearLayout>
    

    这里的布局很简单主要就为了显示一个文本。设置了标题的大小间距等信息。

    • 因为用到webview所以新增一个activity_web_view.xml文件。
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_height="match_parent"
     android:layout_width="match_parent">
    
     <WebView
         android:id="@+id/webView1"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         />
    </RelativeLayout>
    

    以上就是我们编写的布局。在以上用的一些:toolbar 、Recycleview、CoordinatorLayout、AppBarLayout都不是自有的,而是需要加入依赖。在模块buile.gradle中加入以下依赖:

      compile 'com.android.support:recyclerview-v7:26.1.0'
        compile 'com.android.support:design:26.1.0' 
    

    因为我们设置了toolbar,所以不要再用自带的。所以在res/valus/stytles.xml中加入一个noActionbar的stytle.

     <style name="AppTheme.NoActionBar" parent="Theme.AppCompat.Light.NoActionBar">
            <item name="windowActionBar">false</item>
            <item name="windowNoTitle">true</item>
            <item name="android:windowFullscreen">true</item>
        </style>
    

    应用这个styele到我们对应的activity中
    xml <activity android:name=".MyArticleActivity" android:theme="@style/AppTheme.NoActionBar"> </activity>

    1. 编写适配器。代码如下
    package LoginCore;
    
    import android.content.Context;
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v7.widget.RecyclerView;
    import android.text.TextUtils;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.webkit.WebView;
    import android.widget.LinearLayout;
    import android.widget.RelativeLayout;
    import android.widget.TextView;
    
    
    import com.weidian.login.R;
    import com.weidian.login.WebViewActivity;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    
    /**
     * Created by huxy on 2018/3/26.
     */
    
    public class MyArticleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
        private List<QueryArticleResponse.ArticleInfo> articleData;
        private Context context;
    
        public MyArticleAdapter(Context context,List<QueryArticleResponse.ArticleInfo> articleData) {
            this.context = context;
            this.articleData=articleData;
        }
        private Context getContext(){
            return context;
        }
    
        public List<QueryArticleResponse.ArticleInfo> getData() {
            return articleData;
        }
    
        public void setData(QueryArticleResponse data) {
            if (articleData == null) {
                articleData = new ArrayList<>();
            }
            articleData.clear();
            articleData.addAll(data.items);
            notifyDataSetChanged();
        }
    
        public void appendData(QueryArticleResponse data) {
            articleData.addAll(data.items);
            notifyDataSetChanged();
        }
    
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    
            return new MyArticleAdapter.MyArticleViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false));
        }
    
        @Override
        public int getItemCount() {
            return articleData == null ? 0 : articleData.size();
        }
    
        @Override
        public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
            bindItem((MyArticleViewHolder) holder, position);
            //设置点击事件
            ((MyArticleViewHolder) holder).itemLayout.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(context, WebViewActivity.class);
                    ((MyArticleViewHolder) holder).itemLayout.getContext().startActivity(intent);
                }
    
            });
    
        }
    
        private void bindItem(final MyArticleViewHolder holder, int position) {
            if (articleData != null && articleData.size() > position) {
    
                if (articleData != null && articleData.size() > position) {
                    final QueryArticleResponse.ArticleInfo data = articleData.get(position);
                    //设置title
                    holder.itemTitleTxt.setText(data.title);
                    holder.itemTitleTxt.setMaxLines(TextUtils.isEmpty(data.getCover()) ? 1 : 2);
                }
            }
        }
        public class MyArticleViewHolder extends RecyclerView.ViewHolder {
            public LinearLayout itemLayout;
            public TextView itemTitleTxt;
    
            private MyArticleViewHolder(final View v) {
                super(v);
                itemTitleTxt = (TextView) v.findViewById(R.id.my_article_item_title_txt);
                itemLayout = (LinearLayout) v.findViewById(R.id.item_layout);
    
            }
        }
    }
    
    

    关于Recycleview适配器的资料,这里给出一个链接RecyclerView.Adapter.这个是比较详细的,当然我们可以看一个更简单的简单Adapter

    1. 编写activity
    • 主要activity
    
    public class MyArticleActivity extends AppCompatActivity {
       private MyArticleAdapter adapter = new MyArticleAdapter(this, null);
       private RecyclerView myArticleList;
       private int allArticleNum = 0;
       List<QueryArticleResponse.ArticleInfo> articlelist;
       PageRequest pageRequest = new PageRequest();
       ContextParam contextParam = new ContextParam();
       Handler uiHandler = new Handler(Looper.getMainLooper());
    
       private Toolbar toolbar;
    
       public interface ResponseListner {
           void RespondeSuccess(QueryArticleResponse result);
       }
    
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_my_article);
    
           toolbar = findViewById(R.id.toolbar);
           toolbar.setTitle("所有文章");
           //获得recycleview
           RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
           //初始化数据
           try {
               initdata(new ResponseListner() {
                   @Override
                   public void RespondeSuccess(final QueryArticleResponse result) {
                       uiHandler.post(new Runnable() {
                           @Override
                           public void run() {
                               adapter.setData(result);
                           }
                       });
                   }
               });
           } catch (Exception e) {
               e.printStackTrace();
           }
    
           //数据进入适配器
          recyclerView.setLayoutManager(new LinearLayoutManager(this));
           //适配器与recyclerview绑定
           recyclerView.setAdapter(adapter);
           //设置分割线
           recyclerView.addItemDecoration(new MyItemDecoration(this));
       }
    
       public void initdata(final ResponseListner responseListner) throws Exception {
           pageRequest.setPageNumber(1);
           pageRequest.setPageSize(20);
           contextParam.appid = "XXXXX";
           contextParam.userID = "XXXX";
           contextParam.token = "_EwWqqVIQLLhIfAVLURTbiJEqVXo215LK_ERPbGbh7TxuaSdIl75oZXtT1u_roWxJTN2ph0RB1mTFwIQt5FKcE6tVF5P5rQrlbtUZjNLMFYl8jrBGIp4zWqMUOasXvXLxSHdETBdQfUwg9XdDZGccNQPwuvlBSJ8AzoOwIupwtk-OBvogN7I";
           contextParam.wduss = "_EwWqqVIQLLhIfAVLURTbiJEqVXo215LK_ERPbGbh7TxuaSdIl75oZXtT1u_roWxJTN2ph0RB1mTFwIQt5FKcE6tVF5P5rQrlbtUZjNLMFYl8jrBGIp4zWqMUOasXvXLxSHdETBdQfUwg9XdDZGccNQPwuvlBSJ8AzoOwIupwtk-OBvogN7I";
           contextParam.uss = "_EwWqqVIQLLhIfAVLURTbiJEqVXo215LK_ERPbGbh7TxuaSdIl75oZXtT1u_roWxJTN2ph0RB1mTFwIQt5FKcE6tVF5P5rQrlbtUZjNLMFYl8jrBGIp4zWqMUOasXvXLxSHdETBdQfUwg9XdDZGccNQPwuvlBSJ8AzoOwIupwtk-OBvogN7I";
           contextParam.wduserID = "XXXX";
    
           final QueryArticleResponse[] response = new QueryArticleResponse[1];
           //发出请求
           try {
               HttpUtils.CheckResponse(pageRequest, contextParam, "需要填入url", new HttpUtils.OnRespondeSuccessListener() {
                   @Override
                   public void RespondeSuccess(JSONObject result) {
                       String result1 = result.getString("result");
                       //结果进行转换
                       response[0] = JSON.parseObject(result1, QueryArticleResponse.class);
                       responseListner.RespondeSuccess(response[0]);
                   }
    
               });
    
           } catch (IOException e) {
               e.printStackTrace();
               Log.e("请求异常", "not bussiness erro");
           }
       }
    
    以上就是将适配器与Recycleview的绑定。数据来源于我们接口的请求。
    
    - 编写webview的activity
    我们写webbiew是针对于每一个item,都做了一个监听,只要点击item,webview.loadurl("http://wwww.baidu.com")
    
    ```java
    public class WebViewActivity extends AppCompatActivity {
    
       private WebView webView;
    
       public void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_web_view);
           webView = (WebView) findViewById(R.id.webView1);
           webView.setWebViewClient(new WebViewClient());
           webView.setWebChromeClient(new WebChromeClient());
           webView.getSettings().setJavaScriptEnabled(true);
           webView.setLayerType(View.LAYER_TYPE_SOFTWARE,null);
    
           webView.loadUrl("http://www.baidu.com");
    
    
       }
    

    关于MyArticleActivity的工作已经全部做完。现在两个activity之间还未连通。所以下面需要打通activity

    1. loginactivity 与MyArticleActivity打通
      显性的使用Intent来进行跳转,代码如下:
    private void postOnUIThread(final Map<String, String> result) {
            et_username.post(new Runnable() {
                @Override
                public void run() {
                    if(Integer.parseInt(result.get("code"))==0){
                        Intent intent = new Intent(LoginActivity.this,MyArticleActivity.class);
                        //跳转到下一个activity
                        startActivity(intent);
    
    
                    }
                    else {
                        Toast.makeText(getApplicationContext(),result.get("description"),Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    

    登录成功后就跳转到MyArticleActivity。

    编译成功运行

    点击登录,登录成功后跳转到MyArticleActivity


    MyArticleActivity.jpeg

    点击item项就跳转到百度


    WebViewLoadUrl.jpeg

    相关文章

      网友评论

          本文标题:Andorid 获取数据并填充到View

          本文链接:https://www.haomeiwen.com/subject/cnxecftx.html