下拉選則類似spinner_嘯塵學習筆記

下拉選則框製作

先來一張效果圖

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功能描述：點擊圖片彈出選擇框，點擊列表，在editView中填充文字

首先完成主要佈局

EditView+ImageView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hty.myapplication.MainActivity">
<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <EditText
        android:id="@+id/et"
        android:layout_width="match_parent"
        android:layout_height="50dp"/>
    <ImageView
        android:id="@+id/iv"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@drawable/indicator_arrow"
        android:scaleType="fitCenter"
        android:layout_centerVertical="true"
        android:layout_alignRight="@id/et"
        android:layout_marginRight="5dp"/>
</RelativeLayout>
</RelativeLayout>

ImageView實現邏輯

首先ImageView彈出的是popupWindow，然後再設置內部類給popupWindow設置Adapter

package com.hty.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText mEditText;
    private ImageView mImageView;
    private ArrayList<String> mStrings;
    private ListView mListView;
    private PopupWindow mPopupWindow;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        initView();
        initListener();
        initData();

    }

    private void initView() {
        setContentView(R.layout.activity_main);


        mEditText = (EditText) findViewById(R.id.et);
        mImageView = (ImageView) findViewById(R.id.iv);
    }

    private void initListener() {
        mEditText.setOnClickListener(this);
        mImageView.setOnClickListener(this);
    }

    private void initData() {
        mStrings = new ArrayList<String>();
        for (int i = 0; i < 13; i++) {
            mStrings.add("hty" + i);
        }
        initListView();
    }


    private void initListView() {
        mListView = new ListView(this);
        mListView.setAdapter(new myAdapter());

        mListView.setVerticalScrollBarEnabled(false);
    }

    private void showNumber() {

        mPopupWindow = new PopupWindow(mListView, mEditText.getWidth()
                , mEditText.getHeight() * 5);

        mPopupWindow.showAsDropDown(mEditText, 0, 0);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.et:

                break;
            case R.id.iv:
                showNumber();
                break;
        }
    }

    private class myAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return mStrings.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            View view = View.inflate(MainActivity.this, R.layout.item, null);
            ImageView imageView = (ImageView) view.findViewById(R.id.iv_delete);
            TextView textView = (TextView) view.findViewById(R.id.tv);

            textView.setText(mStrings.get(position));

            imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mStrings.remove(position);
                    notifyDataSetChanged();



                    if (mStrings.size() == 0) {
                        mPopupWindow.dismiss();
                        mImageView.setVisibility(View.GONE);
                    }
                }
            });

            textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mEditText.setText(mStrings.get(position));
                    mPopupWindow.dismiss();
                    mImageView.setVisibility(View.GONE);
                }
            });


            return view;
        }
    }
}

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