public class Constants {
public static String[] province = new String[] { "北京市", "天津市", "河北省", "山西省", "內蒙古自治區", "遼寧省", "吉林省", "黑龍江省", "上海市",
"江蘇省", "浙江省", "安徽省", "福建省", "江西省", "山東省", "河南省", "湖北省", "湖南省", "廣東省", "廣西壯族自治區", "海南省", "重慶市", "四川省",
"貴州省", "雲南省", "西藏自治區", "陝西省", "甘肅省", "青海省", "寧夏回族自治區", "新疆維吾爾自治區", "香港", "澳門", "臺灣" };
public static String[][] pandc = new String[][] {
{ "東城區", "西城區", "崇文區", "宣武區", "朝陽區", "豐臺區", "石景山區", "海淀區", "石頭溝區", "房山區", "通州區", "順義區", "昌平區", "大興區",
"懷柔區", "平谷區", "密雲區", "延慶區" },
{ "和平區", "河東區", "河西區", "南開區", "河北區", "紅橋區", "塘沽區", "漢沽區", "大港區", "東麗區", "西青區", "津南區", "北辰區", "武清區", "寶坻區",
"寧河縣", "靜海縣", "薊縣" },
{ "石家莊市", "唐山市", "秦皇島市", "邯鄲市", "邢臺市", "保定市", "張家口市", "承德市", "滄州市", "廊坊市", "衡水市" },
{ "太原市", "大同市", "陽泉市", "長治市", "晉城市", "朔州市", "晉中市", "運城市", "忻州市", "臨汾市", "呂梁市" },
{ "呼和浩特市", "包頭市", "烏海市", "赤峯市", "通遼市", "鄂爾多斯市", "呼倫貝爾市", "巴彥淖爾市", "烏蘭察布市", "興安盟", "錫林郭勒市", "阿拉善盟" },
{ "瀋陽市", "大連市", "鞍山市", "撫順市", "本溪市", "丹東市", "錦州市", "營口市", "阜新市", "遼陽市", "盤錦市", "鐵嶺市", "朝陽市", "葫蘆島市" },
{ "長春市", "吉林市", "四平市", "遼源市", "白山市", "松原市", "白城市", "延邊州" },
{ "哈爾濱市", "齊齊哈爾市", "雞西市", "鶴崗市", "雙鴨山市", "大慶市", "伊春市", "佳木斯市", "七臺河市", "牡丹江市", "黑河市", "綏化市", "大興安嶺地區" },
{ "黃浦區", "盧灣區", "徐彙區", "長寧區", "靜安區", "普陀區", "閘北區", "虹口區", "楊浦區", "閔行區", "寶山區", "嘉定區", "浦東新區", "金山區", "松江區",
"青浦區", "南匯區", "奉賢區", "崇明縣" },
{ "南京市", "無錫市", "徐州市", "常州市", "蘇州市", "南通市", "連雲港市", "淮安市", "鹽城市", "揚州市", "鎮江市", "泰州市", "宿遷市" },
{ "杭州市", "寧波市", "溫州市", "嘉興市", "湖州市", "紹興市", "金華市", "衢州市", "舟山市", "台州市", "麗水市" },
{ "合肥市", "蕪湖市", "蚌埠市", "淮南市", "銅陵市", "安慶市", "黃山市", "滁州市", "阜陽市", "宿州市", "巢湖市", "六安市", "亳州市", "池州市", "宣城市" },
{ "福州市", "廈門市", "莆田市", "三明市", "泉州市", "漳州市", "南平市", "龍巖市", "寧德市" },
{ "南昌市", "景德鎮市", "萍鄉市", "九江市", "新餘市", "鷹潭市", "贛州市", "吉安市", "宜春市", "撫州市", "上饒市" },
{ "濟南市", "青島市", "淄博市", "棗莊市", "東營市", "煙臺市", "廊坊市", "濟寧市", "泰安市", "威海市", "照市", "萊蕪市", "臨沂市", "德州市", "聊城市",
"濱州市", "菏澤市" },
{ "鄭州市", "開封市", "洛陽市", "平頂山市", "安陽市", "鶴壁市", "新鄉市", "焦作市", "濮陽市", "許昌市", "漯河市", "三峽門市", "南陽市", "南丘市",
"信陽市", "周口市", "駐馬店市" },
{ "武漢市", "黃石市", "十堰市", "宜昌市", "襄樊市", "鄂州市", "荊門市", "孝感市", "荊州市", "黃岡市", "咸寧市", "隨州市", "恩施市", "仙桃市", "潛江市",
"天門市", "神農架林區" },
{ "長沙市", "株洲市", "湘潭市", "衡陽市", "邵陽市", "岳陽市", "常德市", "張家界市", "益陽市", "郴州市", "永州市", "懷化市", "婁底市", "湘西市" },
{ "廣州市", "韶關市", "深圳市", "珠海市", "汕頭市", "佛山市", "江門市", "湛江市", "茂名市", "肇慶市", "惠州市", "梅州市", "汕尾市", "河源市", "陽江市",
"清遠市", "東莞市", "中山市", "潮州市", "揭陽市", "雲浮市" },
{ "南寧市", "柳州市", "桂林市", "梧州市", "北海市", "防城港市", "欽州市", "貴港市", "玉林市", "百色市", "賀州市", "河池市", "來賓市", "崇左市" },
{ "海口市", "三亞市", "五指山市", "瓊海市", "儋州市", "文昌市", "萬寧市", "東方市", "安定縣", "屯昌縣", "澄邁縣", "臨高縣", "白沙縣", "昌江縣", "樂東縣",
"陵水縣", "保亭縣", "瓊中縣", "西沙羣島", "南沙羣島", "中沙羣島" },
{ "萬州區", "涪陵區", "渝中區", "大渡口區", "江北區", "沙坪壩區", "九龍坡區", "南岸區", "北碚區", "萬盛區", "雙橋區", "渝北區", "巴南區", "黔江區",
"長壽區", "江津區", "合川區", "永川區", "南川區", "綦江縣", "潼南縣", "銅梁縣", "大足縣", "榮昌縣", "璧山縣", "梁平縣", "城口縣", "豐都縣",
"墊江縣", "武隆縣", "忠縣", "開縣", "雲陽縣", "奉節縣", "巫山縣", "巫溪縣", "石柱縣", "秀山縣" },
{ "成都市", "自貢市", "攀枝花市", "瀘州市", "德陽市", "綿陽市", "廣元市", "遂寧市", "內江市", "樂山市", "南充市", "眉山市", "宜賓市", "廣安市", "達州市",
"雅安市", "巴中市", "資陽市", "阿壩州", "甘孜州", "涼山州" },
{ "貴陽市", "六盤水市", "遵義市", "安順市", "銅仁地區", "黔西南州", "畢節地區", "黔東南州", "黔南州" },
{ "昆明市", "曲靖市", "玉溪市", "保山市", "昭通市", "麗江市", "普洱市", "臨滄市", "文山州", "紅河州", "西雙版納州", "楚雄州", "大理州", "德宏州",
"怒江州", "迪慶州" },
{ "拉薩市", "昌都地區", "山南地區", "喀則地區", "那曲地區", "阿里地區", "林芝地區" },
{ "西安市", "銅川市", "寶雞市", "咸陽市", "渭南市", "延安市", "漢中市", "榆林市", "安康市", "南洛市" },
{ "蘭州市", "嘉峪關市", "金昌市", "白銀市", "天水市", "武威市", "張掖市", "平涼市", "酒泉市", "慶陽市", "定西市", "隴南市", "臨夏州", "甘南州" },
{ "西寧市", "海東地區", "海北州", "黃南州", "海南州", "果洛州", "玉樹州", "海西州" },
{ "銀川市", "石嘴山市", "吳忠市", "固原市", "中衛市" },
{ "烏魯木齊市", "克拉瑪依市", "吐魯番地區", "哈密地區", "昌吉州", "博爾塔拉州", "巴音郭楞州", "阿克蘇地區", "克孜勒蘇州", "喀什地區", "和田地區", "伊犁州",
"塔城地區", "阿勒泰地區", "石河子市", "阿拉爾市", "圖木舒克", "五家渠市" }, { "香港" }, { "澳門" }, { "臺灣" } };
}
public class MainActivity extends Activity {
PickerView minute_pv;
PickerView second_pv;
List<String> province = new ArrayList<String>();
List<String> province0 = new ArrayList<String>();
ArrayList<ArrayList<String>> cityList = new ArrayList<ArrayList<String>>();
String provinceString = "湖南省";
String cityString = "張家界市";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
minute_pv = (PickerView) findViewById(R.id.minute_pv);
second_pv = (PickerView) findViewById(R.id.second_pv);
Collections.addAll(province, Constants.province);
Collections.addAll(province0, Constants.province);
for (int i = 0; i < Constants.pandc.length; i++) {
ArrayList<String> list2 = new ArrayList<String>();
for (int j = 0; j < Constants.pandc[i].length; j++) {
list2.add(Constants.pandc[i][j]);
}
cityList.add(list2);
}
minute_pv.setData(province0);
minute_pv.setOnSelectListener(new onSelectListener() {
@Override
public void onSelect(String text) {
provinceString = text;
for (int i = 0; i < province.size(); i++) {
if (text.equals(province.get(i))) {
second_pv.setData(cityList.get(i));
}
}
}
});
for (int i = 0; i < province.size(); i++) {
if ("湖南省".equals(province.get(i))) {
second_pv.setData(cityList.get(i));
}
}
second_pv.setOnSelectListener(new onSelectListener() {
@Override
public void onSelect(String text) {
cityString = text;
Toast.makeText(MainActivity.this, "選擇了 " + provinceString + cityString, Toast.LENGTH_SHORT).show();
}
});
}
public class PickerView extends View {
public static final String TAG = "PickerView";
/**
* text之間間距和minTextSize之比
*/
public static final float MARGIN_ALPHA = 2.5f;
/**
* 自動回滾到中間的速度
*/
public static final float SPEED = 2;
private List<String> mDataList;
/**
* 選中的位置,這個位置是mDataList的中心位置,一直不變
*/
private int mCurrentSelected;
private Paint mPaint;
private float mMaxTextSize = 50;
private float mMinTextSize = 40;
private float mMaxTextAlpha = 255;
private float mMinTextAlpha = 120;
private int mColorText = 0x333333;
private int mViewHeight;
private int mViewWidth;
private float mLastDownY;
/**
* 滑動的距離
*/
private float mMoveLen = 0;
private boolean isInit = false;
private onSelectListener mSelectListener;
private Timer timer;
private MyTimerTask mTask;
Handler updateHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (Math.abs(mMoveLen) < SPEED) {
mMoveLen = 0;
if (mTask != null) {
mTask.cancel();
mTask = null;
performSelect();
}
} else
// 這裏mMoveLen / Math.abs(mMoveLen)是爲了保有mMoveLen的正負號,以實現上滾或下滾
mMoveLen = mMoveLen - mMoveLen / Math.abs(mMoveLen) * SPEED;
invalidate();
}
};
public PickerView(Context context) {
super(context);
init();
}
public PickerView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public void setOnSelectListener(onSelectListener listener) {
mSelectListener = listener;
}
private void performSelect() {
if (mSelectListener != null)
mSelectListener.onSelect(mDataList.get(mCurrentSelected));
}
public void setData(List<String> datas) {
mDataList = datas;
mCurrentSelected = datas.size() / 2;
invalidate();
}
public void setSelected(int selected) {
mCurrentSelected = selected;
}
private void moveHeadToTail() {
String head = mDataList.get(0);
mDataList.remove(0);
mDataList.add(head);
}
private void moveTailToHead() {
String tail = mDataList.get(mDataList.size() - 1);
mDataList.remove(mDataList.size() - 1);
mDataList.add(0, tail);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mViewHeight = getMeasuredHeight();
mViewWidth = getMeasuredWidth();
isInit = true;
invalidate();
}
private void init() {
timer = new Timer();
mDataList = new ArrayList<String>();
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Style.FILL);
mPaint.setTextAlign(Align.CENTER);
mPaint.setColor(mColorText);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 根據index繪製view
if (isInit)
drawData(canvas);
}
private void drawData(Canvas canvas) {
mPaint.setColor(Color.GRAY); // 設置畫筆顏色
mPaint.setStrokeWidth((float) 0.7); // 設置線寬
canvas.drawLine(0, mViewHeight/2 - 50, mViewWidth, mViewHeight/2 - 50, mPaint);
canvas.drawLine(0, mViewHeight/2 + 50, mViewWidth, mViewHeight/2 + 50, mPaint);
// 先繪製選中的text再往上往下繪製其餘的text
float scale = parabola(mViewHeight / 4.0f, mMoveLen);
float size = (mMaxTextSize - mMinTextSize) * scale + mMinTextSize;
mPaint.setTextSize(size);
mPaint.setColor(Color.parseColor("#FF7F28"));
mPaint.setAlpha((int) ((mMaxTextAlpha - mMinTextAlpha) * scale + mMinTextAlpha));
// text居中繪製,注意baseline的計算才能達到居中,y值是text中心座標
float x = (float) (mViewWidth / 2.0);
float y = (float) (mViewHeight / 2.0 + mMoveLen);
FontMetricsInt fmi = mPaint.getFontMetricsInt();
float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
canvas.drawText(mDataList.get(mCurrentSelected), x, baseline, mPaint);
// 繪製上方data
for (int i = 1; (mCurrentSelected - i) >= 0; i++) {
drawOtherText(canvas, i, -1);
}
// 繪製下方data
for (int i = 1; (mCurrentSelected + i) < mDataList.size(); i++) {
drawOtherText(canvas, i, 1);
}
}
/**
* @param canvas
* @param position
* 距離mCurrentSelected的差值
* @param type
* 1表示向下繪製,-1表示向上繪製
*/
private void drawOtherText(Canvas canvas, int position, int type) {
float d = (float) (MARGIN_ALPHA * mMinTextSize * position + type * mMoveLen);
float scale = parabola(mViewHeight / 4.0f, d);
float size = (mMaxTextSize - mMinTextSize) * scale + mMinTextSize;
mPaint.setTextSize(size);
mPaint.setColor(Color.parseColor("#000000"));
mPaint.setAlpha((int) ((mMaxTextAlpha - mMinTextAlpha) * scale + mMinTextAlpha));
float y = (float) (mViewHeight / 2.0 + type * d);
FontMetricsInt fmi = mPaint.getFontMetricsInt();
float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
canvas.drawText(mDataList.get(mCurrentSelected + type * position), (float) (mViewWidth / 2.0), baseline, mPaint);
}
/**
* 拋物線
*
* @param zero
* 零點座標
* @param x
* 偏移量
* @return scale
*/
private float parabola(float zero, float x) {
float f = (float) (1 - Math.pow(x / zero, 2));
return f < 0 ? 0 : f;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
doDown(event);
break;
case MotionEvent.ACTION_MOVE:
doMove(event);
break;
case MotionEvent.ACTION_UP:
doUp(event);
break;
}
return true;
}
private void doDown(MotionEvent event) {
if (mTask != null) {
mTask.cancel();
mTask = null;
}
mLastDownY = event.getY();
}
private void doMove(MotionEvent event) {
mMoveLen += (event.getY() - mLastDownY);
if (mMoveLen > MARGIN_ALPHA * mMinTextSize / 2) {
// 往下滑超過離開距離
moveTailToHead();
mMoveLen = mMoveLen - MARGIN_ALPHA * mMinTextSize;
} else if (mMoveLen < -MARGIN_ALPHA * mMinTextSize / 2) {
// 往上滑超過離開距離
moveHeadToTail();
mMoveLen = mMoveLen + MARGIN_ALPHA * mMinTextSize;
}
mLastDownY = event.getY();
invalidate();
}
private void doUp(MotionEvent event) {
// 擡起手後mCurrentSelected的位置由當前位置move到中間選中位置
if (Math.abs(mMoveLen) < 0.0001) {
mMoveLen = 0;
return;
}
if (mTask != null) {
mTask.cancel();
mTask = null;
}
mTask = new MyTimerTask(updateHandler);
timer.schedule(mTask, 0, 10);
}
class MyTimerTask extends TimerTask {
Handler handler;
public MyTimerTask(Handler handler) {
this.handler = handler;
}
@Override
public void run() {
handler.sendMessage(handler.obtainMessage());
}
}
public interface onSelectListener {
void onSelect(String text);
}
}