android-wheel實現省、市、地區聯動選擇效果

android-wheel實現省、市、地區聯動選擇效果

咱們都知道在IOS裏面有個滾輪選擇器，在Android中有人也實現了一個相似的，叫android-wheel。不過我的感受實現的仍是有點粗糙，這個後面再說。android-wheel給出了好幾個不一樣類型的demo，不過裏面的demo有個時間選擇器(年月日選擇)。沒用過的能夠去看看裏面的demo，應對通常的都沒什麼大礙。因爲公司項目要省、市、地區選擇的功能，還要和IOS日期選擇器同樣，因此就研究了下android-wheel。下面說說我是如何實現省、市、地區選擇的功能，還望你們指出其中的不足一塊兒討論。

首先是xml佈局 (Activity_main.xml)

<LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android"

android:layout_height= "fill_parent"

android:layout_width= "fill_parent"

android:orientation= "vertical"

android:background= "@drawable/layout_bg" >

<LinearLayout

android:layout_height= "wrap_content"

android:layout_width= "wrap_content"

android:layout_gravity= "center_horizontal"

android:paddingTop= "30dp" >

<kankan.wheel.widget.WheelView android:id= "@+id/provice"

android:layout_height= "wrap_content"

android:layout_width= "wrap_content"

android:minWidth= "100dp"

/>

<kankan.wheel.widget.WheelView android:id= "@+id/city"

android:layout_height= "wrap_content"

android:layout_width= "100dp" />

<kankan.wheel.widget.WheelView android:id= "@+id/area"

android:layout_height= "wrap_content"

android:layout_width= "wrap_content" />

</LinearLayout>

<Button

android:id= "@+id/btnOK"

android:layout_width= "match_parent"

android:layout_height= "wrap_content"

android:layout_marginTop= "30dp"

android:text= "肯定"

/>

</LinearLayout>

在Activity_main.xml 文件中佈局三個滾輪控件和一個按鈕，三個滾輪分別是省、市、地區選擇滾輪。最後按下按鈕的時候Toast顯示選擇的省市地區和所選擇的地址在數據庫中的key。

數據庫裏面的數據是有必定查詢規則的，如圖所示：

DQXX03爲1，2，3分別表明省(直轄市)、市、地區。因此要得到全部省只需查詢DQXX03爲1就好了。若是要查詢某個省下面的市呢？好比要查詢河北省的全部市，能夠這麼寫sql語句 select DQX_DQXX01 from DQXX where DQXX02="河北省"; 這樣就查出來了河北省對應的DQX_DQXX01的值爲13，而後根據這個值在經過select DQXX01,DQXX02 from DQXX  where DQX_DQXX01=13 就查詢出來了每一個市的對應鍵DQXX01的值爲1301，1302，1303.......，查詢地區也是相似的，這個時候根據DQX_DQXX01=1301或者1302.....查詢對應的地區。最後省，市，地區鏈接起來就是DQXX05列裏面的值，咱們只要查詢下就能夠知道惟一地址DQXX01的值。

下面是主Activity文件

package com.wheeltest;

import java.io.IOException;
import java.util.Map;

import kankan.wheel.widget.OnWheelScrollListener;
import kankan.wheel.widget.WheelView;
import kankan.wheel.widget.adapters.ArrayWheelAdapter;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Typeface;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

publicclass MainActivity extends Activity {
privatestaticfinal String TAG = "MainActivity";
privatestaticfinal String DBNAME = "dqxx.sqlite";
privatestaticfinal String TABLE_NAME = "dqxx";
private SQLiteDatabase db;
private Map<String, Integer> provinceMap;
private Map<String, Integer> cityMap;
private Map<String, Integer> areaMap;

private String[] provinceArray;
private String[] cityArray;
private String[] areaArray;

private WheelView provinceWheelView;
private WheelView cityWheelView;
private WheelView areaWheelView;

private ProviceCityAreaAdapter provinceAdapter;
private ProviceCityAreaAdapter cityAdapter;
private ProviceCityAreaAdapter areaAdapter;
private Handler mHandler = new Handler();
@Override
protectedvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initWheelView();

        findViewById(R.id.btnOK).setOnClickListener(new View.OnClickListener() {

@Override
publicvoid onClick(View arg0) {
                mHandler.postDelayed(new Runnable() {

@Override
publicvoid run() {
                        StringBuilder sb = new StringBuilder();
                        sb.append(provinceArray[provinceWheelView.getCurrentItem()]);
if (provinceArray[provinceWheelView.getCurrentItem()].endsWith("市")) {
                            sb.append("市轄區");
                        }else {
                            sb.append(cityArray[cityWheelView.getCurrentItem()]);
                        }
                        sb.append(areaArray[areaWheelView.getCurrentItem()]);

                        Toast.makeText(MainActivity.this, sb.toString()+" key:"+DqxxUtils.findPrimaryKey(db, TABLE_NAME, sb.toString()), Toast.LENGTH_SHORT).show();
                    }
                }, 400);

            }
        });
    }

publicvoid initWheelView() {
        provinceWheelView = (WheelView)findViewById(R.id.provice);
        cityWheelView = (WheelView)findViewById(R.id.city);
        areaWheelView = (WheelView)findViewById(R.id.area);

//初始化省滾輪列表選擇器
        initProviceMap();
        provinceAdapter = new ProviceCityAreaAdapter(MainActivity.this, provinceArray, 0);
        provinceWheelView.setViewAdapter(provinceAdapter);
        provinceWheelView.setCurrentItem(0);
        provinceWheelView.addScrollingListener(privinceScrollListener);

//初始化城市滾輪列表選擇器
        String provinceName = provinceArray[0];
int dqx_dqxx01 = provinceMap.get(provinceName);
if (provinceName.endsWith("市")) {
            initCityMap(dqx_dqxx01, false);
        }else {
            initCityMap(dqx_dqxx01, true);
        }
        cityAdapter = new ProviceCityAreaAdapter(MainActivity.this, cityArray, 0);
        cityWheelView.setViewAdapter(cityAdapter);
        cityWheelView.setCurrentItem(0);
        cityWheelView.addScrollingListener(cityScrollListener);

//初始化地區滾輪列表選擇器
        String cityName = cityArray[0];
int dqx_dqxx01_2 = cityMap.get(cityName);
        provinceName = cityArray[0];
if (provinceName.endsWith("市")) {
            dqx_dqxx01_2 = dqx_dqxx01_2 * 100 +1;
        }
        initAreaMap(dqx_dqxx01_2);
        areaAdapter = new ProviceCityAreaAdapter(MainActivity.this, areaArray, 0);
        areaWheelView.setViewAdapter(areaAdapter);
        areaWheelView.setCurrentItem(0);

    }


    OnWheelScrollListener privinceScrollListener = new OnWheelScrollListener() {

@Override
publicvoid onScrollingStarted(WheelView wheel) {
        }

@Override
publicvoid onScrollingFinished(WheelView wheel) {
int currentItem = wheel.getCurrentItem();
            String provinceName = provinceArray[currentItem];
int dqxx01 = provinceMap.get(provinceName);
if (provinceName.endsWith("市")) {
                initCityMap(dqxx01, false);
            }else {
                initCityMap(dqxx01, true);
            }

            cityAdapter = new ProviceCityAreaAdapter(MainActivity.this, cityArray, 0);
            cityWheelView.setViewAdapter(cityAdapter);
            cityWheelView.setCurrentItem(0);

            String cityName = cityArray[0];
int dqx_dqxx01_2 = cityMap.get(cityName);
if (provinceName.endsWith("市")) {
                dqx_dqxx01_2 = dqx_dqxx01_2 * 100 +1;
            }
            initAreaMap(dqx_dqxx01_2);
            areaAdapter = new ProviceCityAreaAdapter(MainActivity.this, areaArray, 0);
            areaWheelView.setViewAdapter(areaAdapter);
            areaWheelView.setCurrentItem(0);
        }
    };


    OnWheelScrollListener cityScrollListener = new OnWheelScrollListener() {

@Override
publicvoid onScrollingStarted(WheelView wheel) {
        }

@Override
publicvoid onScrollingFinished(WheelView wheel) {
            String provinceName = provinceArray[provinceWheelView.getCurrentItem()];
int dqx_dqxx01 = cityMap.get(cityArray[wheel.getCurrentItem()]);
if (provinceName.endsWith("市")) {
                dqx_dqxx01 = dqx_dqxx01 * 100 +1;
            }
            initAreaMap(dqx_dqxx01);
            areaAdapter = new ProviceCityAreaAdapter(MainActivity.this, areaArray, 0);
            areaWheelView.setViewAdapter(areaAdapter);
            areaWheelView.setCurrentItem(0);
        }
    };


publicvoid initProviceMap() {
try {
            DqxxUtils.copyDB(MainActivity.this, DBNAME);
if (db == null) {
                db = openOrCreateDatabase(getFilesDir().getAbsolutePath() + "/" +DBNAME, Context.MODE_PRIVATE, null);
            }
            provinceMap = DqxxUtils.getProvince(db, TABLE_NAME);
            provinceArray = provinceMap.keySet().toArray(new String[provinceMap.size()]);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

publicvoid initCityMap(int dqx_dqxx01, boolean municipalities) {
try {
            DqxxUtils.copyDB(MainActivity.this, DBNAME);
if (db == null) {
                db = openOrCreateDatabase(getFilesDir().getAbsolutePath() + "/" +DBNAME, Context.MODE_PRIVATE, null);
            }
            cityMap = DqxxUtils.getCity(db, TABLE_NAME, dqx_dqxx01, municipalities);
            cityArray = cityMap.keySet().toArray(new String[cityMap.size()]);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

publicvoid initAreaMap(int dqx_dqxx01) {
try {
            DqxxUtils.copyDB(MainActivity.this, DBNAME);
if (db == null) {
                db = openOrCreateDatabase(getFilesDir().getAbsolutePath() + "/" +DBNAME, Context.MODE_PRIVATE, null);
            }
            areaMap = DqxxUtils.getArea(db, TABLE_NAME, dqx_dqxx01);
            areaArray = areaMap.keySet().toArray(new String[areaMap.size()]);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }



publicclass ProviceCityAreaAdapter extends ArrayWheelAdapter<String> {
privateint currentItem;
privateint currentValue;

public ProviceCityAreaAdapter(Context context, String[] items, int current) {
super(context, items);
this.currentValue = current;
        }


publicvoid setCurrentValue(int value){
this.currentValue = value;
        }

@Override
protectedvoid configureTextView(TextView view) {
super.configureTextView(view);
//          if (currentItem == currentValue) {
//              view.setTextColor(0xFF0000F0);
//          }
            view.setTypeface(Typeface.SANS_SERIF);
        }

@Override
public View getItem(int index, View convertView, ViewGroup parent) {
            currentItem = index;
returnsuper.getItem(index, convertView, parent);
        }

    }

@Override
protectedvoid onDestroy() {
if (db != null) {
            db.close();
            db = null;
        }
super.onDestroy();
    }

首先定義了三個數組，分別用來裝查詢到的省，市和地區，其實在這三個之中，省份是不會動態變得。每次都同樣，關鍵就在於，每次省滾輪改變後要查詢到對應的市和市對應的地區數據，要及時查詢出來，否則會有卡頓的感受，流暢性很差。個人數據庫起初是放在assert目錄下面，而後把它寫到應用程序對應的/data/data/包名/files目錄下，而後在該目錄下打開數據庫。這裏涉及到一些緩衝和效率方面的東西，我如今是公用全局的SQLiteDatabase對象db，不是每次都打開數據庫。而後每次查詢都只查詢出對用所須要的列的數據來，這個能夠加快查詢。原本我想實現滾輪選擇某個數據的時候該數據行深色顯示，可是發現好像挺難實現的，android-wheel好像作的不是很強大，也多是我愚笨沒找到實現的方法吧。有知道的麻煩說句啊，謝了。

最後一個類是工具類，包含一些數據庫操做和文件讀寫的。我就不貼出來了。我已經把這個工程放到Github上去了地址https://github.com/ywenblocker/Provinces-Picker-wheel你們能夠看看，有問題也歡迎提出來。最後附上一張效果圖。