Android——速記MVP模式，並實現 一圖一標題 瀏覽跳轉網頁

模型層Model——使用java的集合保存數據源

private ArrayList<String> mTitleList;
private ArrayList<String> mUrlList;
private ArrayList<Integer> mImageList;//圖片的id爲int類型

視圖層ListView

private ListView mListView;

表示層Presenter

private ArrayAdapter <String> mAdapter;
private SimpleAdapter mAdapter;

android:autoLink=“web” 設置TextView爲超鏈接

各層之間的聯繫

模型層Model與適配器之間的聯繫

mAdapter=new ArrayAdapter< String>(MainActivity.this,android.R.layout.simple_expandable_list_item_1,mDataList);
mAdapter = new SimpleAdapter(this,mDataList,R.layout.item_layout,new String[]{"T","I"},new int []{R.id.text,R.id.img});

視圖層View與適配器之間的聯繫

mListView.setAdapter(mAdapter);
mAdapter=new ArrayAdapter< String>(MainActivity.this,android.R.layout.simple_expandable_list_item_1,mDataList);
mAdapter = new SimpleAdapter(this,mDataList,R.layout.item_layout,new String[]{"T","I"},new int []{R.id.text,R.id.img});

代碼如下

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</RelativeLayout>

activity_news.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/text_news"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:autoLink="web" />

</LinearLayout>

item_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:orientation="horizontal"
    >
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:layout_weight="1"
        android:id="@+id/img"
        />
    <TextView
        android:layout_weight="4"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:id="@+id/text"
        android:gravity="center"
        />
</LinearLayout>

MainActivity.java:

public class MainActivity extends Activity {

    // Model:模型層，使用ArrayList<String>保存數據源
    private ArrayList<String> mTitleList; 
    private ArrayList<String> mUrlList;
    private ArrayList<Integer> mImageList;

    // View：視圖層，ListView
    private ListView mListView;

    private ArrayList<HashMap<String,Object>> mDataList;
    // Presenter：表示層，ArrayAdapter
    private SimpleAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 實例化數據源
        mTitleList = new ArrayList<String>();
        mTitleList.add("111");
        mTitleList.add("222");
        mTitleList.add("333！");
        mTitleList.add("444");
        mTitleList.add("555");
        mTitleList.add("666");
        mTitleList.add("777");
        mTitleList.add("888");
        mTitleList.add("999");
        mTitleList.add("101010");
        mTitleList.add("111111");
        mTitleList.add("121212");
        mTitleList.add("131313");
        mTitleList.add("141414");
        mTitleList.add("151515");
        // 對應的新聞連接
        mUrlList = new ArrayList<String>();
        mUrlList.add("https://www.csdn.net/");
        mUrlList.add("https://github.com/");
        mUrlList.add("https://www.saikr.com/vs");
        mUrlList.add("https://www.icourse163.org/");
        mUrlList.add("https://www.nowcoder.com/");
        mUrlList.add("https://www.runoob.com/");
        mUrlList.add("https://kns.cnki.net/kns/brief/default_result.aspx");
        mUrlList.add("https://www.ximalaya.com/");
        mUrlList.add("https://ocw.mit.edu/index.htm");
        mUrlList.add("https://www.sojson.com/");
        mUrlList.add("https://www.cnblogs.com/");
        mUrlList.add("https://www.buaa.edu.cn/");
        mUrlList.add("https://www.baidu.com/");
        mUrlList.add("https://pixabay.com/");
        mUrlList.add("https://element.eleme.cn/#/zh-CN");

        mImageList=new ArrayList<Integer>();
        mImageList.add(R.mipmap.home);
        mImageList.add(R.mipmap.trival);
        mImageList.add(R.mipmap.shop);
        mImageList.add(R.mipmap.son);
        mImageList.add(R.mipmap.ticket);
        mImageList.add(R.mipmap.ic_launcher);
        mImageList.add(R.mipmap.food);
        mImageList.add(R.mipmap.house);
        mImageList.add(R.mipmap.trafic);
        mImageList.add(R.mipmap.home);
        mImageList.add(R.mipmap.trafic);
        mImageList.add(R.mipmap.ticket);
        mImageList.add(R.mipmap.home);
        mImageList.add(R.mipmap.plane);
        mImageList.add(R.mipmap.shop);

        mDataList=new ArrayList<HashMap<String,Object>>();
        for(int i=0;i<mTitleList.size();i++){
            HashMap<String,Object> map=new HashMap<String,Object>();
            map.put("T",mTitleList.get(i));
            map.put("I",mImageList.get(i));

            mDataList.add(map);
        }

        // 找控件
        mListView = (ListView) findViewById(R.id.list_view);

        // 實例化適配器

        mAdapter = new SimpleAdapter(this,mDataList,R.layout.item_layout,new String[]{"T","I"},new int []{R.id.text,R.id.img});

        // 發現視圖層View沒有跟表示層Presenter建立關係
        mListView.setAdapter(mAdapter);

        // 設置點擊事件監聽器
        mListView.setOnItemClickListener(new OnItemClickListener() {

            // 參數三：位置，即點擊的是第幾個Item
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // 拿到點擊的新聞對應的鏈接
                String url = mUrlList.get(position);
                //跳轉傳值
                Intent intent = new Intent(MainActivity.this,NewsActivity.class);
                intent.putExtra("url", url);
                startActivity(intent);
            }
        });

        // 補充長按刪除功能（只是爲了講解數據更新後如何刷新頁面）
        // 設置單個Item長按的事件監聽器
        mListView.setOnItemLongClickListener(new OnItemLongClickListener() {

            // 參數三：位置，即長按的是第幾個Item
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                // 先刪數據源，再刷新視圖
                mTitleList.remove(position);
                mUrlList.remove(position);
                // 通知視圖刷新
                mAdapter.notifyDataSetChanged();
                Toast.makeText(MainActivity.this, "刪除了第" + position + "條！", Toast.LENGTH_SHORT).show();
                return true; // 寫成true
            }
        });
    }
}

NewsActivity.java:

package com.example.homework3;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class NewsActivity extends Activity{

    private TextView mText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //設置佈局文件
        setContentView(R.layout.activity_news);

        //先取出Intent，再取出Intent裏面的數據
        Intent intent = getIntent();
        String url = intent.getStringExtra("url");
        //給文本顯示控件設置顯示的內容
        mText = (TextView)findViewById(R.id.text_news);
        //設置顯示文字
        mText.setText(url);
    }

}