详谈自定义View之GridView单选 金额选择Layout-ChooseMoneyLayout

思路：

外层控件用的是GridView，里面每个item放一个FrameLayout，FrameLayout里面有Checkbox和ImageView，chechBox添加background实现选中效果,选中背景为透明，显示item的勾勾图标，不选中checkbox就有背景，挡住选中的勾勾。。重写GridView，实现监听和数据适配，用一个接口返回选中的数据。

代码：

ChooseMoneyLayout.java

public class ChooseMoneyLayout extends GridView {

  private int[] moneyList = {};  //数据源

  private LayoutInflater mInflater; 

  private MyAdapter adapter;  //适配器

  int defaultChoose = 0;   //默认选中项

  public ChooseMoneyLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    setData();
  }

  public void setData() {
    mInflater = LayoutInflater.from(getContext());
    //配置适配器
    adapter = new MyAdapter();
    setAdapter(adapter);
  }

  /**
   * 设置默认选择项目，
   * @param defaultChoose
   */
  public void setDefaultPositon(int defaultChoose) {
    this.defaultChoose = defaultChoose;
    adapter.notifyDataSetChanged();
  }

  /**
   * 设置数据源
   * @param moneyData
   */
  public void setMoneyData(int[] moneyData){
    this.moneyList = moneyData;
  }

  class MyAdapter extends BaseAdapter {

    private CheckBox checkBox;

    @Override
    public int getCount() {
      return moneyList.length;
    }

    @Override
    public Object getItem(int position) {
      return moneyList[position];
    }

    @Override
    public long getItemId(int position) {
      return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
      MyViewHolder holder;
      if (convertView == null) {
        holder = new MyViewHolder();
        convertView = mInflater.inflate(R.layout.item_money_pay, parent, false);
        holder.moneyPayCb = (CheckBox) convertView.findViewById(R.id.money_pay_cb);
        convertView.setTag(holder);
      } else {
        holder = (MyViewHolder) convertView.getTag();
      }

      holder.moneyPayCb.setText(getItem(position) + "元");

      holder.moneyPayCb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
          if (isChecked) {
            //设置选中文字颜色
            buttonView.setTextColor(getResources().getColor(R.color.light_color_blue));

            //取消上一个选择
            if (checkBox != null) {
              checkBox.setChecked(false);
            }
            checkBox = (CheckBox) buttonView;
          } else {
            checkBox = null;
            //设置不选中文字颜色
            buttonView.setTextColor(getResources().getColor(R.color.darkgray));
          }
          //回调
          listener.chooseMoney(position, isChecked, (Integer) getItem(position));
        }
      });

      if (position == defaultChoose) {
        defaultChoose = -1;
        holder.moneyPayCb.setChecked(true);
        checkBox = holder.moneyPayCb;
      }

      return convertView;
    }

    private class MyViewHolder {
      private CheckBox moneyPayCb;
    }
  }

  /**
   * 解决嵌套显示不完
   * @param widthMeasureSpec
   * @param heightMeasureSpec
   */
  @Override
  public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
        MeasureSpec.AT_MOST);
    super.onMeasure(widthMeasureSpec, expandSpec);
  }

  private onChoseMoneyListener listener;

  public void setOnChoseMoneyListener(onChoseMoneyListener listener) {
    this.listener = listener;
  }

  public interface onChoseMoneyListener {
    /**
     * 选择金额返回
     *
     * @param position gridView的位置
     * @param isCheck 是否选中
     * @param moneyNum 钱数
     */
    void chooseMoney(int position, boolean isCheck, int moneyNum);
  }
}

item_money_pay.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="80dp"
  android:descendantFocusability="blocksDescendants">

<!-- 选中时候的图片 -->
  <ImageView
    android:layout_width="15dp"
    android:layout_height="15dp"
    android:layout_gravity="right|bottom"
    android:layout_marginBottom="3dp"
    android:layout_marginRight="3dp"
    android:maxHeight="9dp"
    android:maxWidth="9dp"
    android:scaleType="fitCenter"
    android:src="@drawable/money_pay_type_choose" />

  <CheckBox
    android:id="@+id/money_pay_cb"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:background="@drawable/money_pay_selector"
    android:button="@null"
    android:gravity="center"
    android:paddingBottom="2.5dp"
    android:paddingLeft="15dp"
    android:paddingRight="15dp"
    android:paddingTop="2.5dp"
    android:textSize="20sp"
    android:textColor="#ff777777"
    />

</FrameLayout>

CheckBox的background: money_pay_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

  <item android:state_pressed="true" android:drawable="@drawable/blue_border_noback_drawable"/>
  <item android:state_selected="true" android:drawable="@drawable/blue_border_noback_drawable"/>
  <item android:state_checked="true" android:drawable="@drawable/blue_border_noback_drawable"/>

  <item >

    <shape>
      <solid android:color="#ffffffff"/>
      <corners android:radius="5dp"/>
      <stroke android:color="#ffbfbfbf"
        android:width="1dp"/>
    </shape>

  </item>

</selector>

activity xml:

<com.minstone.view.ChooseMoneyLayout
      android:id="@+id/money_chose_money"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_margin="10dp"
      android:horizontalSpacing="17dp"
      android:numColumns="3"
      android:verticalSpacing="20dp" />

activity里面代码:

private ChooseMoneyLayout moneyChoseMoney;
  private int money; //当前选择的金额

  private void initData() {
    //获取控件
    moneyChoseMoney = (ChooseMoneyLayout)findViewById(R.id.money_chose_money);
    //数设置据源
    moneyChoseMoney.setMoneyData(new int[]{30, 50, 100, 200, 300, 500,1000});
    //设置默认选中项
    moneyChoseMoney.setDefaultPositon(3);
    //金额选择监听
    moneyChoseMoney.setOnChoseMoneyListener(new ChooseMoneyLayout.onChoseMoneyListener() {
      @Override
      public void chooseMoney(int position,boolean isCheck, int moneyNum) {
        if(isCheck){
          money = moneyNum;
          ToastUtil.showCustomToast(PayActivity.this,money+"");
        }else{
          money = 0;
        }
      }
    });

  }

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