MVP二级购物车布局和简单逻辑

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原创最新推荐文章于 2026-09-11 15:06:27 发布 460 阅读 AI 写同款· GEO 优化 ›

Android TabLayout + ViewPager2 导航实现与避坑指南 TabLayout 和 ViewPager2 是 Android 中实现标签式页面导航的基础组件，属于 Fragment 容器与 UI 指示器协同工作的典型范式。其核心原理是通过声明式绑定（setupWithViewPager）自动同步页面滑动与标签选中状态，避免手动监听导致的线程调度和生命周期错乱问题。技术价值在于轻量、稳定、低学习成本，且深度集成 AndroidX 生命周期管理，显著降低 Fragment 重建丢失、状态不同步等高频崩溃风险。广泛应用于新闻、电商、工具类 App 的顶部多标签页场景，尤其阅读详情

布局用到组合控件,适配器展示RecyclerView

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycle"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="0dp"/>

</LinearLayout>

适配器的布局文件引入组合控件

            <com.bwie.d.yuekaogouwu1.view.PlusView
                android:id="@+id/plusView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="10dp"/>

</LinearLayout>

组合控件

MainActivity的逻辑代码

public class MainActivity extends AppCompatActivity implements MyPresenter.ViewCallBack{

    private CheckBox quanxuan;
    private TextView zong;
    private TextView liang;
    private RecyclerView recyclerView;
    private MyPresenter presenter;
    private MyAdapter adapter;
    private LinearLayoutManager manager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = (RecyclerView) findViewById(R.id.recycle);
        quanxuan = (CheckBox) findViewById(R.id.quanxuan);
        zong = (TextView) findViewById(R.id.zong);
        liang = (TextView) findViewById(R.id.liang);

presenter = new MyPresenter(this);
presenter.getdata();

        adapter = new MyAdapter(MainActivity.this);
        manager = new LinearLayoutManager(MainActivity.this,LinearLayoutManager.VERTICAL,false);
        recyclerView.setLayoutManager(manager);
        recyclerView.setAdapter(adapter);

        adapter.setListener(new MyAdapter.UpdateUiListener() {
            @Override
            public void setTotal(String total, String num, boolean allcheck) {
                zong.setText(total);
                liang.setText(num);
                quanxuan.setChecked(allcheck);
            }
        });

        quanxuan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                adapter.selectAll(quanxuan.isChecked());
            }
        });

}

@Override
public void success(GetBean getBean) {

adapter.add(getBean);
}

@Override
public void failure(Exception e) {

}

    @Override
    protected void onDestroy() {
        super.onDestroy();
        presenter.detach();
    }

组合控件的逻辑代码

public class PlusView extends LinearLayout{

    private EditText editText;
    private Button add;
    private Button revserse;
    private int mCount = 1;

    public PlusView(Context context) {
        super(context);
    }

public PlusView(Context context, AttributeSet attrs) {
super(context, attrs);

        View view = View.inflate(context, R.layout.layout_recy, null);
        editText = (EditText) view.findViewById(R.id.content);
        add = (Button) view.findViewById(R.id.add);
        revserse = (Button) view.findViewById(R.id.revserse);

        add.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                String trim = editText.getText().toString().trim();
                int count = Integer.valueOf(trim)+1;
                mCount = count;
                editText.setText(count+"");
                if(linsenter !=null){
                    linsenter.click(count);
                }
            }
        });

        revserse.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                String trim = editText.getText().toString().trim();
                int count = Integer.valueOf(trim);
                if(count>1){
                    count--;
                    mCount = count;
                    editText.setText(count+"");
                }
                if(linsenter!=null){
                    linsenter.click(count);
                }

}
});

addView(view);
}

    public void setEditView(int num){
        if(editText!=null){
            editText.setText(num+"");
        }
    }

    public PlusView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    ClickLisenter linsenter;
    public void setLinsenter(ClickLisenter linsenter){
        this.linsenter = linsenter;
    }

    public interface ClickLisenter{
        public void click(int count);
    }
}