安卓干货铺-自定义收银键盘（末尾福利）「建议收藏」

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实现步骤:

自定义的键盘主要是根据GridView+EditText结合来写的。

1.首先看下GridView的布局:

 <GridView
 android:horizontalSpacing="2dp"
 android:verticalSpacing="2dp"
 android:inputType="numberDecimal"
 android:editable="false"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:numColumns="3"
 android:id="@+id/gridview"></GridView>

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2.PayKeyAdapter 适配器里设置键盘12个按键的文字和类型

欢迎大家来到IT世界,在知识的湖畔探索吧!private String[] texts = {
 //九宫格图片下方文字的设置 
 "1", 
 "2", 
 "3", 
 "4", 
 "5", 
 "6", 
 "7", 
 "8", 
 "9", 
 ".", 
 "0",
 "✖"
 };
 private String[] types = {
 //存放在text的tag中
 "num", 
 "num", 
 "num", 
 "num", 
 "num", 
 "num", 
 "num", 
 "num", 
 "num", 
 "point", 
 "num",
 "back",
 };

3.然后再适配器的getView方法里给键盘文字设置TAG，下面是getView方法

@Override
 public View getView(int position, View view, ViewGroup viewgroup) {
 ImgTextWrapper wrapper; 
 if(view==null) { 
 wrapper = new ImgTextWrapper(); 
 LayoutInflater inflater = LayoutInflater.from(context);
 view = inflater.inflate(R.layout.grid_menu_item_pay, null);
 view.setTag(wrapper); 
 view.setPadding(26, 26, 26, 26); //每格的间距
 } else { 
 wrapper = (ImgTextWrapper)view.getTag(); 
 } 
 wrapper.textView = (TextView)view.findViewById(R.id.GridTextView);
 wrapper.iv_back= (ImageView) view.findViewById(R.id.iv_back);
 if (position<11){
 wrapper.textView.setVisibility(View.VISIBLE);
 wrapper.iv_back.setVisibility(View.GONE);
 wrapper.textView.setText(texts[position]);
 }else {
 wrapper.textView.setVisibility(View.GONE);
 wrapper.iv_back.setVisibility(View.VISIBLE);
 }
 wrapper.textView.setTag(types[position]);
 return view; 
 } 
 class ImgTextWrapper { 
 ImageView iv_back;
 TextView textView;
 }

4.核心的语法在GridView的setOnItemClickListener事件，定义String类型的KeyType来获取TAG。

欢迎大家来到IT世界,在知识的湖畔探索吧!gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String keyType = view.findViewById(R.id.GridTextView).getTag().toString();
String textValue = ((TextView)view.findViewById(R.id.GridTextView)).getText().toString();
String editText = editMemberAmount.getText().toString();
if(keyType.equals("num")){
//数字键
try{
String orgValue = numList.get(numIndex);
if(editText.equals("0")){
editMemberAmount.setText(textValue);
}else{
//小数点最多只能后两位
if(orgValue.equals("0.00")){
orgValue=textValue;
numList.set(numIndex, textValue);
editMemberAmount.setText(textValue);
return;
}
if(orgValue.lastIndexOf(".")!=-1 && orgValue.lastIndexOf(".")<orgValue.length()-2){
Toast.makeText(getApplicationContext(),"只能输入小数点后两位",Toast.LENGTH_SHORT).show();
}else{
if(editText.length()>=18){
Toast.makeText(getApplicationContext(),"一次输入算式无法超过18个字符",Toast.LENGTH_SHORT).show();
return;
}
int numLen = orgValue.length();
if(orgValue.lastIndexOf(".")!=-1){
numLen = orgValue.lastIndexOf(".")+1;
}
if(numLen==7){
Toast.makeText(getApplicationContext(),"收款金额不能超过7位数",Toast.LENGTH_SHORT).show();
}else{
numList.set(numIndex, orgValue+textValue);
editMemberAmount.setText(editText+textValue);
}
}
}
}catch(Exception e){
numIndex=0;
numList=new ArrayList<String>();
numList.add(textValue);
editMemberAmount.setText(textValue);
}
}
if(keyType.equals("back")){
//退格
try{
if(editText.lastIndexOf("+") == editText.length()-1){
//最后为加则减少一位
numList.set(numIndex,"");
numIndex--;
editMemberAmount.setText(editText.substring(0,editText.length()-1));
}else{
String orgValue = numList.get(numIndex);
if(!orgValue.equals("")){
numList.set(numIndex, orgValue.substring(0,orgValue.length()-1));
}
if(editText.equals("0")||editText.length()==1){
editMemberAmount.setText("0.00");
numList.set(numIndex,"0.00");
}else{
editMemberAmount.setText(editText.substring(0,editText.length()-1));
}
}
}catch(Exception e){
numIndex=0;
numList=new ArrayList<String>();
numList.add("0");
editMemberAmount.setText("");
}
}
if(keyType.equals("point")){
//小数点
try{
String orgValue = numList.get(numIndex);
if(orgValue.lastIndexOf(".")!=-1){
Toast.makeText(getApplicationContext(),"已存在小数点",Toast.LENGTH_SHORT).show();
}else{
if(editText.lastIndexOf("+") == editText.length()-1){
//最后为加则补0
numList.set(numIndex, orgValue+"0"+textValue);
editMemberAmount.setText(editText+"0"+textValue);
}else{
numList.set(numIndex, orgValue+textValue);
editMemberAmount.setText(editText+textValue);
}
}
}catch(Exception e){
numIndex=0;
numList=new ArrayList<String>();
numList.add("0.");
editMemberAmount.setText("0.");
}
}
}
}
});

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