Android自定義可迴圈的滾動選擇器CycleWheelView

Android自定義可迴圈的滾動選擇器CycleWheelView
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最近碰到個專案要使用到滾動選擇器,原生的NumberPicker可定製性太差,不大符合UI要求。
網上開源的WheelView是用ScrollView寫的,不能迴圈滾動,而且當資料量很大時要載入的Item太多,效能非常低。
然後,還是自己寫一個比較靠譜,用的是ListView實現的。寫完自己體驗了一下,效能不錯,再大的資料也不怕了。
感覺不錯,重新封裝了一下,提供了一些介面可以直接按照自己的需求定製,呼叫方法在MainActivity中。
補個圖片: 

不多說了,直接上程式碼:

CycleWheelView.java:


/**
* Copyright (C) 2015
*
* CycleWheelView.java
*
* Description: 
*
* Author: Liao Longhui 
*
* Ver 1.0, 2015-07-15, Liao Longhui, Create file
*/
package com.example.wheelviewdemo;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* 可迴圈滾動的選擇器
* @author Liao Longhui
*
*/
public class CycleWheelView extends ListView {
public static final String TAG = CycleWheelView.class.getSimpleName();
private static final int COLOR_DIVIDER_DEFALUT = Color.parseColor("#747474");
private static final int HEIGHT_DIVIDER_DEFAULT = 2;
private static final int COLOR_SOLID_DEFAULT = Color.parseColor("#3e4043");
private static final int COLOR_SOLID_SELET_DEFAULT = Color.parseColor("#323335");
private static final int WHEEL_SIZE_DEFAULT = 3;
private Handler mHandler;
private CycleWheelViewAdapter mAdapter;
/**
* Labels
*/
private List<String> mLabels;
/**
* Color Of Selected Label
*/
private int mLabelSelectColor = Color.WHITE;
/**
* Color Of Unselected Label
*/
private int mLabelColor = Color.GRAY;
/**
* Gradual Alph
*/
private float mAlphaGradual = 0.7f;
/**
* Color Of Divider
*/
private int dividerColor = COLOR_DIVIDER_DEFALUT;
/**
* Height Of Divider
*/
private int dividerHeight = HEIGHT_DIVIDER_DEFAULT;
/**
* Color of Selected Solid
*/
private int seletedSolidColor = COLOR_SOLID_SELET_DEFAULT;
/**
* Color of Unselected Solid
*/
private int solidColor = COLOR_SOLID_DEFAULT;
/**
* Size Of Wheel , it should be odd number like 3 or greater
*/
private int mWheelSize = WHEEL_SIZE_DEFAULT;
/**
* res Id of Wheel Item Layout
*/
private int mItemLayoutId;
/**
* res Id of Label TextView
*/
private int mItemLabelTvId;
/**
* Height of Wheel Item
*/
private int mItemHeight;
private boolean cylceEnable;
private int mCurrentPositon;
private WheelItemSelectedListener mItemSelectedListener;
public CycleWheelView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public CycleWheelView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CycleWheelView(Context context) {
super(context);
}
private void init() {
mHandler = new Handler();
mItemLayoutId = R.layout.item_cyclewheel;
mItemLabelTvId = R.id.tv_label_item_wheel;
mAdapter = new CycleWheelViewAdapter();
setVerticalScrollBarEnabled(false);
setScrollingCacheEnabled(false);
setCacheColorHint(Color.TRANSPARENT);
setFadingEdgeLength(0);
setOverScrollMode(OVER_SCROLL_NEVER);
setDividerHeight(0);
setAdapter(mAdapter);
setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == SCROLL_STATE_IDLE) {
View itemView = getChildAt(0);
if (itemView != null) {
float deltaY = itemView.getY();
if (deltaY == 0) {
return;
}
if (Math.abs(deltaY) < mItemHeight / 2) {
smoothScrollBy(getDistance(deltaY), 50);
} else {
smoothScrollBy(getDistance(mItemHeight   deltaY), 50);
}
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
int totalItemCount) {
refreshItems();
}
});
}
private int getDistance(float scrollDistance) {
if (Math.abs(scrollDistance) <= 2) {
return (int) scrollDistance;
} else if (Math.abs(scrollDistance) < 12) {
return scrollDistance > 0 ? 2 : -2;
} else {
return (int) (scrollDistance / 6);
}
}
private void refreshItems() {
int offset = mWheelSize / 2;
int firstPosition = getFirstVisiblePosition();
int position = 0;
if (getChildAt(0) == null) {
return;
}
if (Math.abs(getChildAt(0).getY()) <= mItemHeight / 2) {
position = firstPosition   offset;
} else {
position = firstPosition   offset   1;
}
if (position == mCurrentPositon) {
return;
}
mCurrentPositon = position;
if (mItemSelectedListener != null) {
mItemSelectedListener.onItemSelected(getSelection(), getSelectLabel());
}
resetItems(firstPosition, position, offset);
}
private void resetItems(int firstPosition, int position, int offset){
for (int i = position - offset - 1; i < position   offset   1; i  ) {
View itemView = getChildAt(i - firstPosition);
if (itemView == null) {
continue;
}
TextView labelTv = (TextView) itemView.findViewById(mItemLabelTvId);
if (position == i) {
labelTv.setTextColor(mLabelSelectColor);
itemView.setAlpha(1f);
} else {
labelTv.setTextColor(mLabelColor);
int delta = Math.abs(i - position);
double alpha = Math.pow(mAlphaGradual, delta);
itemView.setAlpha((float) alpha);
}
}
}
/**
* 設定滾輪的刻度列表
* 
* @param labels
*/
public void setLabels(List<String> labels) {
mLabels = labels;
mAdapter.setData(mLabels);
mAdapter.notifyDataSetChanged();
initView();
}
/**
* 設定滾輪滾動監聽
* 
* @param mItemSelectedListener
*/
public void setOnWheelItemSelectedListener(WheelItemSelectedListener mItemSelectedListener) {
this.mItemSelectedListener = mItemSelectedListener;
}
/**
* 獲取滾輪的刻度列表
* 
* @return
*/
public List<String> getLabels() {
return mLabels;
}
/**
* 設定滾輪是否為迴圈滾動
* 
* @param enable true-迴圈 false-單程
*/
public void setCycleEnable(boolean enable) {
if (cylceEnable != enable) {
cylceEnable = enable;
mAdapter.notifyDataSetChanged();
setSelection(getSelection());
}
}
/*
* 滾動到指定位置
*/
@Override
public void setSelection(final int position) {
mHandler.post(new Runnable() {
@Override
public void run() {
CycleWheelView.super.setSelection(getPosition(position));
}
});
}
private int getPosition(int positon) {
if (mLabels == null || mLabels.size() == 0) {
return 0;
}
if (cylceEnable) {
int d = Integer.MAX_VALUE / 2 / mLabels.size();
return positon   d * mLabels.size();
}
return positon;
}
/**
* 獲取當前滾輪位置
* 
* @return
*/
public int getSelection() {
if (mCurrentPositon == 0) {
mCurrentPositon = mWheelSize / 2;
}
return (mCurrentPositon - mWheelSize / 2) % mLabels.size();
}
/**
* 獲取當前滾輪位置的刻度
* 
* @return
*/
public String getSelectLabel() {
int position = getSelection();
position = position < 0 ? 0 : position;
try {
return mLabels.get(position);
} catch (Exception e) {
return "";
}
}
/**
* 如果需要自定義滾輪每個Item,呼叫此方法設定自定義Item佈局,自定義佈局中需要一個TextView來顯示滾輪刻度
* 
* @param itemResId 佈局檔案Id
* @param labelTvId 刻度TextView的資源Id
*/
public void setWheelItemLayout(int itemResId, int labelTvId) {
mItemLayoutId = itemResId;
mItemLabelTvId = labelTvId;
mAdapter = new CycleWheelViewAdapter();
mAdapter.setData(mLabels);
setAdapter(mAdapter);
initView();
}
/**
* 設定未選中刻度文字顏色
* 
* @param labelColor
*/
public void setLabelColor(int labelColor) {
this.mLabelColor = labelColor;
resetItems(getFirstVisiblePosition(), mCurrentPositon, mWheelSize/2);
}
/**
* 設定選中刻度文字顏色
* 
* @param labelSelectColor
*/
public void setLabelSelectColor(int labelSelectColor) {
this.mLabelSelectColor = labelSelectColor;
resetItems(getFirstVisiblePosition(), mCurrentPositon, mWheelSize/2);
}
/**
* 設定滾輪刻度透明漸變值
* 
* @param alphaGradual
*/
public void setAlphaGradual(float alphaGradual) {
this.mAlphaGradual = alphaGradual;
resetItems(getFirstVisiblePosition(), mCurrentPositon, mWheelSize/2);
}
/**
* 設定滾輪可顯示的刻度數量,必須為奇數,且大於等於3
* 
* @param wheelSize
* @throws CycleWheelViewException 滾輪數量錯誤
*/
public void setWheelSize(int wheelSize) throws CycleWheelViewException {
if (wheelSize < 3 || wheelSize % 2 != 1) {
throw new CycleWheelViewException("Wheel Size Error , Must Be 3,5,7,9...");
} else {
mWheelSize = wheelSize;
initView();
}
}
/**
* 設定塊的顏色
* @param unselectedSolidColor 未選中的塊的顏色
* @param selectedSolidColor 選中的塊的顏色
*/
public void setSolid(int unselectedSolidColor, int selectedSolidColor){
this.solidColor = unselectedSolidColor;
this.seletedSolidColor = selectedSolidColor;
initView();
}
/**
* 設定分割線樣式
* @param dividerColor 分割線顏色
* @param dividerHeight 分割線高度(px)
*/
public void setDivider(int dividerColor, int dividerHeight){
this.dividerColor = dividerColor;
this.dividerHeight = dividerHeight;
}
@SuppressWarnings("deprecation")
private void initView() {
mItemHeight = measureHeight();
ViewGroup.LayoutParams lp = getLayoutParams();
lp.height = mItemHeight * mWheelSize;
mAdapter.setData(mLabels);
mAdapter.notifyDataSetChanged();
Drawable backgroud = new Drawable() {
@Override
public void draw(Canvas canvas) {
int viewWidth = getWidth();
Paint dividerPaint = new Paint();
dividerPaint.setColor(dividerColor);
dividerPaint.setStrokeWidth(dividerHeight);
Paint seletedSolidPaint = new Paint();
seletedSolidPaint.setColor(seletedSolidColor);
Paint solidPaint = new Paint();
solidPaint.setColor(solidColor);
canvas.drawRect(0, 0, viewWidth, mItemHeight * (mWheelSize / 2), solidPaint);
canvas.drawRect(0, mItemHeight * (mWheelSize / 2   1), viewWidth, mItemHeight
* (mWheelSize), solidPaint);
canvas.drawRect(0, mItemHeight * (mWheelSize / 2), viewWidth, mItemHeight
* (mWheelSize / 2   1), seletedSolidPaint);
canvas.drawLine(0, mItemHeight * (mWheelSize / 2), viewWidth, mItemHeight
* (mWheelSize / 2), dividerPaint);
canvas.drawLine(0, mItemHeight * (mWheelSize / 2   1), viewWidth, mItemHeight
* (mWheelSize / 2   1), dividerPaint);
}
@Override
public void setAlpha(int alpha) {
}
@Override
public void setColorFilter(ColorFilter cf) {
}
@Override
public int getOpacity() {
return 0;
}
};
setBackgroundDrawable(backgroud);
}
private int measureHeight() {
View itemView = LayoutInflater.from(getContext()).inflate(mItemLayoutId, null);
itemView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
itemView.measure(w, h);
int height = itemView.getMeasuredHeight();
// int width = view.getMeasuredWidth();
return height;
}
public interface WheelItemSelectedListener {
public void onItemSelected(int position, String label);
}
public class CycleWheelViewException extends Exception {
private static final long serialVersionUID = 1L;
public CycleWheelViewException(String detailMessage) {
super(detailMessage);
}
}
public class CycleWheelViewAdapter extends BaseAdapter {
private List<String> mData = new ArrayList<String>();
public void setData(List<String> mWheelLabels) {
mData.clear();
mData.addAll(mWheelLabels);
}
@Override
public int getCount() {
if (cylceEnable) {
return Integer.MAX_VALUE;
}
return mData.size()   mWheelSize - 1;
}
@Override
public Object getItem(int position) {
return "";
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public boolean isEnabled(int position) {
return false;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(mItemLayoutId, null);
}
TextView textView = (TextView) convertView.findViewById(mItemLabelTvId);
if (position < mWheelSize / 2
|| (!cylceEnable && position >= mData.size()   mWheelSize / 2)) {
textView.setText("");
convertView.setVisibility(View.INVISIBLE);
} else {
textView.setText(mData.get((position - mWheelSize / 2) % mData.size()));
convertView.setVisibility(View.VISIBLE);
}
return convertView;
}
}
}

 

MainActivity.java: 


public class MainActivity extends Activity {
private CycleWheelView cycleWheelView0,cycleWheelView1, cycleWheelView2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cycleWheelView0 = (CycleWheelView) findViewById(R.id.cycleWheelView);
List<String> labels = new ArrayList<>();
for (int i = 0; i < 12; i  ) {
labels.add(""   i);
}
cycleWheelView0.setLabels(labels);
cycleWheelView0.setAlphaGradual(0.5f);
cycleWheelView0.setOnWheelItemSelectedListener(new WheelItemSelectedListener() {
@Override
public void onItemSelected(int position, String label) {
Log.d("test", label);
}
});
cycleWheelView1 = (CycleWheelView) findViewById(R.id.cycleWheelView1);
List<String> labels1 = new ArrayList<>();
for (int i = 0; i < 24; i  ) {
labels1.add(""   i);
}
cycleWheelView1.setLabels(labels1);
try {
cycleWheelView1.setWheelSize(5);
} catch (CycleWheelViewException e) {
e.printStackTrace();
}
cycleWheelView1.setSelection(2);
cycleWheelView1.setWheelItemLayout(R.layout.item_cyclewheel_custom, R.id.tv_label_item_wheel_custom);
cycleWheelView1.setOnWheelItemSelectedListener(new WheelItemSelectedListener() {
@Override
public void onItemSelected(int position, String label) {
Log.d("test", label);
}
});
cycleWheelView2 = (CycleWheelView) findViewById(R.id.cycleWheelView2);
List<String> labels2 = new ArrayList<>();
for (int i = 0; i < 60; i  ) {
labels2.add(""   i);
}
cycleWheelView2.setLabels(labels2);
try {
cycleWheelView2.setWheelSize(7);
} catch (CycleWheelViewException e) {
e.printStackTrace();
}
cycleWheelView2.setCycleEnable(true);
cycleWheelView2.setSelection(30);
cycleWheelView2.setAlphaGradual(0.6f);
cycleWheelView2.setDivider(Color.parseColor("#abcdef"), 2);
cycleWheelView2.setSolid(Color.WHITE,Color.WHITE);
cycleWheelView2.setLabelColor(Color.BLUE);
cycleWheelView2.setLabelSelectColor(Color.RED);
cycleWheelView2.setOnWheelItemSelectedListener(new WheelItemSelectedListener() {
@Override
public void onItemSelected(int position, String label) {
Log.d("test", label);
}
});
}
}

Item_cyclewheel.xml: 


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:background="@android:color/transparent" >
<TextView
android:id="@ id/tv_label_item_wheel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:singleLine="true"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>

Item_cyclewheel_custom.xml: 


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:background="@android:color/transparent" >
<TextView
android:id="@ id/tv_label_item_wheel_custom"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" />
<ImageView
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:src="@drawable/ic_launcher" />
</RelativeLayout>

activity_main.xml: 


<LinearLayout 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:orientation="horizontal" >
<com.example.wheelviewdemo.CycleWheelView
android:id="@ id/cycleWheelView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >
</com.example.wheelviewdemo.CycleWheelView>
<com.example.wheelviewdemo.CycleWheelView
android:id="@ id/cycleWheelView1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >
</com.example.wheelviewdemo.CycleWheelView>
<com.example.wheelviewdemo.CycleWheelView
android:id="@ id/cycleWheelView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >
</com.example.wheelviewdemo.CycleWheelView>
</LinearLayout>

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