Android 实现购物车加减功能,效果图如下所示:
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public class adderView extends LinearLayout implements View.OnClickListener, TextWatcher { private int amount = 0 ; //购买数量 private int goods_storage = Integer.MAX_VALUE; //商品库存 private OnAmountChangeListener mListener; private EditText etAmount; private Button btnDecrease; private Button btnIncrease; public adderView(Context context) { this (context, null ); } public adderView(Context context, AttributeSet attrs) { super (context, attrs); LayoutInflater.from(context).inflate(R.layout.number_adder, this ); etAmount = (EditText) findViewById(R.id.etAmount); btnDecrease = (Button) findViewById(R.id.btnDecrease); btnIncrease = (Button) findViewById(R.id.btnIncrease); btnDecrease.setOnClickListener( this ); btnIncrease.setOnClickListener( this ); etAmount.addTextChangedListener( this ); TypedArray obtainStyledAttributes = getContext().obtainStyledAttributes(attrs, R.styleable.AmountView); int btnWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnWidth, 100 ); int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvWidth, 200 ); int tvTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvTextSize, 0 ); int btnTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnTextSize, 0 ); obtainStyledAttributes.recycle(); LayoutParams btnParams = new LayoutParams(btnWidth, LayoutParams.MATCH_PARENT); btnDecrease.setLayoutParams(btnParams); btnIncrease.setLayoutParams(btnParams); if (btnTextSize != 0 ) { btnDecrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize); btnIncrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize); } LayoutParams textParams = new LayoutParams(tvWidth, LayoutParams.MATCH_PARENT); etAmount.setLayoutParams(textParams); if (tvTextSize != 0 ) { etAmount.setTextSize(tvTextSize); } } public void setOnAmountChangeListener(OnAmountChangeListener onAmountChangeListener) { this .mListener = onAmountChangeListener; } public void setGoods_storage( int goods_storage) { this .goods_storage = goods_storage; } public void setTextCount( int count){ this .amount = count; this .etAmount.setText(amount+ "" ); } @Override public void onClick(View v) { int i = v.getId(); if (i == R.id.btnDecrease) { if (amount > 0 ) { amount--; etAmount.setText(amount + "" ); } } else if (i == R.id.btnIncrease) { if (amount < goods_storage) { amount++; etAmount.setText(amount + "" ); } } etAmount.clearFocus(); if (mListener != null ) { mListener.onAmountChange( this , amount); } } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { if (s.toString().isEmpty()) return ; amount = Integer.valueOf(s.toString()); if (amount > goods_storage) { etAmount.setText(goods_storage + "" ); return ; } if (amount == 0 ){ // btnDecrease.setBackgroundResource(R.drawable.jian); } if (amount > 0 ){ // btnDecrease.setBackgroundResource(R.drawable.lvjian); } if (mListener != null ) { mListener.onAmountChange( this , amount); } } public interface OnAmountChangeListener { void onAmountChange(View view, int amount); } |
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<?xml version= "1.0" encoding= "utf-8" ?> <com.zhy.autolayout.AutoLinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:layout_width= "match_parent" android:layout_height= "90px" android:focusable= "true" android:divider= "@drawable/divder" android:background= "@drawable/bg_amout_layout" android:showDividers= "middle" android:orientation= "horizontal" > <Button android:id= "@+id/btnDecrease" android:layout_width= "0dp" android:layout_height= "wrap_content" android:layout_weight= "1" android:gravity= "center" android:background= "@drawable/jian" /> <EditText android:id= "@+id/etAmount" android:layout_width= "200px" android:layout_height= "match_parent" android:minWidth= "150px" android:layout_weight= "2" android:background= "@null" android:inputType= "number" android:textSize= "13sp" android:text= "0" android:gravity= "center" /> <Button android:id= "@+id/btnIncrease" android:layout_width= "0dp" android:layout_height= "wrap_content" android:layout_weight= "1" android:gravity= "center" android:background= "@drawable/jia" /> </com.zhy.autolayout.AutoLinearLayout> |
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原文链接:https://blog.csdn.net/qq_40747809/article/details/105745237