android 购物车加减器功能代码

最新推荐文章于 2021-06-02 17:51:43 发布

一只徐老大

最新推荐文章于 2021-06-02 17:51:43 发布

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本文链接：https://blog.youkuaiyun.com/qq_37267423/article/details/78418269

本文介绍了一个自定义的Android视图组件AddDeleteView，该组件允许用户通过点击按钮来增加或减少一个数值。文章详细展示了如何创建这个组件，并在MainActivity中实现其功能。

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//AddDeleteView

public class AddDeleteView extends LinearLayout {
    private OnAddDelClickListener listener;
    private EditText etNumber;

    public AddDeleteView(Context context) {
        this(context,null);
    }

    public AddDeleteView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public AddDeleteView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        initView(context, attrs, defStyleAttr);
    }

    private void initView(Context context, AttributeSet attrs, int defStyleAttr) {

        View.inflate(context,R.layout.add_delete,this);

        TextView tvAdd =(TextView)findViewById(R.id.tv_add);

        TextView tvDel =(TextView)findViewById(R.id.tv_delete);

        etNumber = findViewById(R.id.et_number);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.AddDeleteViewStyle);

        String leftText = typedArray.getString(R.styleable.AddDeleteViewStyle_left_text);
        String rightText = typedArray.getString(R.styleable.AddDeleteViewStyle_right_text);
        String middleText = typedArray.getString(R.styleable.AddDeleteViewStyle_middle_text);


        tvAdd.setText(rightText);
        tvDel.setText(leftText);
        etNumber.setText(middleText);

        typedArray.recycle();


        tvAdd.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onAddClick(view);


            }
        });

        tvDel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onDelClick(view);
            }
        });


    }

    interface OnAddDelClickListener{
        void onAddClick(View v);
        void onDelClick(View v);
    }

    public void setOnAddDelClickListener(OnAddDelClickListener listener){

        if(listener!=null){

            this.listener=listener;
        }
    }

    public void setNumber(int number){
       if(number>0){
            etNumber.setText(number+"");
       }
    }

    public int getNumber(){

        int number = 0;
        try {
            String numberStr = etNumber.getText().toString().trim();

            number = Integer.parseInt(numberStr);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }


        return number;
    }


}

//MainActivity

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final AddDeleteView adv= (AddDeleteView) findViewById(R.id.adv);

        adv.setOnAddDelClickListener(new AddDeleteView.OnAddDelClickListener() {
            @Override
            public void onAddClick(View v) {
                int number = adv.getNumber();
                number++;
                adv.setNumber(number);
            }

            @Override
            public void onDelClick(View v) {
                int number = adv.getNumber();
                number--;
                adv.setNumber(number);
            }
        });
    }
}