Android--MVP架构设计Listview

来源：互联网发布：淘宝限购在哪里设置编辑：程序博客网时间：2024/05/02 02:44

MVP：Model View Presenter
Model：业务逻辑（加载数据）
View：视图（显示数据）
Presenter：中间者（绑定Model和View）

实现效果 Demo运行效果

创建View 的接口

public interface JView {    /*加载进度条*/    void showLoading();    /*显示数据*/    void showData(List<JEntityData> datas);}

创建Model的接口

public interface JModel {    /**     * 加载数据     */    void loadData(DataOnLoadListener listener);    /**     *加载完成的监听     */    interface DataOnLoadListener{        void  onComplete(List<JEntityData> datas);    }}

创建ModelImpl的接口

public class JModelImpl implements JModel{    @Override    public void loadData(DataOnLoadListener listener) {        List<JEntityData> datas=new ArrayList<JEntityData>();        datas.add(new JEntityData("NAME11111111111111",1,"123"));        datas.add(new JEntityData("NAME111222222222221",1,"123"));        datas.add(new JEntityData("NAME111222222222221",1,"123"));        datas.add(new JEntityData("NAME111222222222221",1,"123"));        datas.add(new JEntityData("NAME111222222222221",1,"123"));        datas.add(new JEntityData("NAME111222222222221",1,"123"));        datas.add(new JEntityData("NAME111222222222221",1,"123"));        //回调监听        listener.onComplete(datas);    }}

创建Presenter接口

public class JPresenter extends BasePresenter<JView> {//    view interface    JView mView;//    model interface    JModel mModel =new JModelImpl();/** * 通过构造方法实例化mView * */    public JPresenter(JView mView) {        this.mView = mView;    }    /*绑定view和model*/    public void fetch(){        //显示进度条        mView.showLoading();        //让Modle加载数据        if(mModel!=null){            mModel.loadData(new JModel.DataOnLoadListener() {                @Override                public void onComplete(List<JEntityData> datas) {                    //给View显示                    mView.showData(datas);                }            });        }    }}

Activity代码

public class MainActivity extends MVPBaseActivity<JView,JPresenter> implements JView{    private ListView listView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView= (ListView) findViewById(R.id.listView_id);//        listView.setAdapter(new ListViewAdapter(this));        //中间者,让他触发加载数据//    不继承 MVPBaseActivity    new JPresenter(this).fetch();        mPresenter.fetch();    }    @Override    protected JPresenter createPresenter() {        return new JPresenter(this);    }    @Override    public void showLoading() {        Toast.makeText(this,"正在加载",Toast.LENGTH_SHORT).show();    }    @Override    public void showData(List<JEntityData> datas) {        listView.setAdapter(new ListViewAdapter(this,datas));    }}

为了防止View进程在Model（加载数据）未完成时，View被回收。需要将actvity继承MVPBaseActivity以及persenter继承BasePersenter 代码如下：
BasePresenter代码

public abstract class BasePresenter<T> {  /*  * 当内存不足可释放内存  * */    protected WeakReference<T> mViewRef;    /*    * 绑定presenter View    * */    public void attchView(T view){        mViewRef=new WeakReference<T>(view);    }    /*    * 解除管理    * */    public void detachView(){        if (mViewRef!=null){            mViewRef.clear();            mViewRef=null;        }    }    protected T getView(){        return mViewRef.get();    }}

MVPBaseActivity代码

public abstract class MVPBaseActivity<A,T extends BasePresenter<A>> extends AppCompatActivity {    protected T mPresenter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        创建Presenter        mPresenter=createPresenter();//        内存泄漏//        关联view        mPresenter.attchView((A) this);    }    @Override    protected void onDestroy() {        super.onDestroy();//        解除关联        mPresenter.detachView();    }    protected abstract T createPresenter();}

Adapter代码（实现简单的2个TextView）

public class ListViewAdapter extends BaseAdapter{    private List<JEntityData> list;    private LayoutInflater inflater;    public ListViewAdapter(Context context,List<JEntityData> list) {        this.inflater=LayoutInflater.from(context);        this.list=list;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int i) {        return list.get(i);    }    @Override    public long getItemId(int i) {        return i;    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {        ViewHolder viewHolder=null;        if (view==null){            viewHolder=new ViewHolder();            view=inflater.inflate(R.layout.item_list,null);            viewHolder.name= (TextView) view.findViewById(R.id.name);            viewHolder.text= (TextView) view.findViewById(R.id.text);            view.setTag(viewHolder);        }else {            viewHolder=(ViewHolder) view.getTag();        }        viewHolder.name.setText(list.get(i).getName());        viewHolder.name.setText(list.get(i).getPhoto());        return view;    }    class ViewHolder{        TextView name;        TextView text;    }}

1 0