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@@ -0,0 +1,384 @@
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+package com.tencent.liteav.demo.superplayer.ui.view;
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+
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+import android.app.Activity;
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+import android.content.Context;
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+import android.graphics.Canvas;
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+import android.graphics.Color;
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+import android.graphics.ColorFilter;
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+import android.graphics.Paint;
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+import android.graphics.PixelFormat;
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+import android.graphics.drawable.Drawable;
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+import android.os.Build;
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+import android.util.AttributeSet;
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+import android.util.Log;
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+import android.util.TypedValue;
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+import android.view.Gravity;
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+import android.view.MotionEvent;
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+import android.view.View;
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+import android.view.ViewGroup;
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+import android.widget.LinearLayout;
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+import android.widget.ScrollView;
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+import android.widget.TextView;
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+
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+import java.util.ArrayList;
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+import java.util.List;
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+
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+/**
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+ * Author: wangjie
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+ * Email: tiantian.china.2@gmail.com
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+ * Date: 7/1/14.
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+ */
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+public class WheelView extends ScrollView {
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+ public static final String TAG = WheelView.class.getSimpleName();
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+
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+ public static class OnWheelViewListener {
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+ public void onSelected(int selectedIndex, String item) {
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+ }
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+ }
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+
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+
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+ private Context context;
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+// private ScrollView scrollView;
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+
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+ private LinearLayout views;
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+
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+ public WheelView(Context context) {
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+ super(context);
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+ init(context);
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+ }
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+
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+ public WheelView(Context context, AttributeSet attrs) {
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+ super(context, attrs);
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+ init(context);
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+ }
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+
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+ public WheelView(Context context, AttributeSet attrs, int defStyle) {
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+ super(context, attrs, defStyle);
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+ init(context);
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+ }
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+
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+ // String[] items;
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+ List<String> items;
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+
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+ private List<String> getItems() {
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+ return items;
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+ }
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+
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+ public void setItems(List<String> list) {
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+ if (null == items) {
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+ items = new ArrayList<String>();
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+ }
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+ items.clear();
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+ items.addAll(list);
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+
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+ // 前面和后面补全
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+ for (int i = 0; i < offset; i++) {
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+ items.add(0, "");
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+ items.add("");
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+ }
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+
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+ initData();
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+
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+ }
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+
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+
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+ public static final int OFF_SET_DEFAULT = 1;
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+ int offset = OFF_SET_DEFAULT; // 偏移量(需要在最前面和最后面补全)
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+
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+ public int getOffset() {
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+ return offset;
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+ }
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+
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+ public void setOffset(int offset) {
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+ this.offset = offset;
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+ }
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+
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+ int displayItemCount; // 每页显示的数量
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+
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+ int selectedIndex = 1;
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+
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+
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+ private void init(Context context) {
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+ this.context = context;
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+ Log.d(TAG, "parent: " + this.getParent());
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+ this.setVerticalScrollBarEnabled(false);
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+
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+ views = new LinearLayout(context);
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+ views.setOrientation(LinearLayout.VERTICAL);
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+ this.addView(views);
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+
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+ scrollerTask = new Runnable() {
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+
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+ public void run() {
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+
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+ int newY = getScrollY();
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+ if (initialY - newY == 0) { // stopped
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+ final int remainder = initialY % itemHeight;
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+ final int divided = initialY / itemHeight;
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+ if (remainder == 0) {
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+ selectedIndex = divided + offset;
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+
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+ onSeletedCallBack();
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+ } else {
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+ if (remainder > itemHeight / 2) {
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+ WheelView.this.post(new Runnable() {
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+ @Override
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+ public void run() {
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+ WheelView.this.smoothScrollTo(0, initialY - remainder + itemHeight);
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+ selectedIndex = divided + offset + 1;
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+ onSeletedCallBack();
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+ }
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+ });
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+ } else {
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+ WheelView.this.post(new Runnable() {
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+ @Override
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+ public void run() {
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+ WheelView.this.smoothScrollTo(0, initialY - remainder);
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+ selectedIndex = divided + offset;
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+ onSeletedCallBack();
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+ }
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+ });
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+ }
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+
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+
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+ }
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+
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+
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+ } else {
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+ initialY = getScrollY();
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+ WheelView.this.postDelayed(scrollerTask, newCheck);
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+ }
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+ }
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+ };
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+
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+
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+ }
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+
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+ int initialY;
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+
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+ Runnable scrollerTask;
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+ int newCheck = 50;
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+
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+ public void startScrollerTask() {
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+
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+ initialY = getScrollY();
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+ this.postDelayed(scrollerTask, newCheck);
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+ }
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+
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+ private void initData() {
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+ displayItemCount = offset * 2 + 1;
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+
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+ for (String item : items) {
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+ views.addView(createView(item));
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+ }
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+
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+ refreshItemView(0);
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+ }
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+
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+ int itemHeight = 0;
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+
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+ private TextView createView(String item) {
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+ TextView tv = new TextView(context);
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+ tv.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
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+ tv.setSingleLine(true);
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+ tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 15);
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+ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
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+ tv.setLineHeight(21);
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+ } else {
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+ tv.setHeight(dip2px(21));
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+ }
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+ tv.setText(item);
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+ tv.setGravity(Gravity.CENTER);
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+ int padding = dip2px(5);
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+ tv.setPadding(padding, padding, padding, padding);
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+ if (0 == itemHeight) {
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+ itemHeight = getViewMeasuredHeight(tv);
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+ Log.d(TAG, "itemHeight: " + itemHeight);
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+ views.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, itemHeight * displayItemCount));
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+ LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) this.getLayoutParams();
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+ this.setLayoutParams(new LinearLayout.LayoutParams(lp.width, itemHeight * displayItemCount));
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+ }
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+ return tv;
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+ }
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+
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+
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+ @Override
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+ protected void onScrollChanged(int l, int t, int oldl, int oldt) {
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+ super.onScrollChanged(l, t, oldl, oldt);
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+ refreshItemView(t);
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+
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+ if (t > oldt) {
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+ scrollDirection = SCROLL_DIRECTION_DOWN;
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+ } else {
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+ scrollDirection = SCROLL_DIRECTION_UP;
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+ }
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+ }
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+
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+ private void refreshItemView(int y) {
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+ int position = y / itemHeight + offset;
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+ int remainder = y % itemHeight;
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+ int divided = y / itemHeight;
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+
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+ if (remainder == 0) {
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+ position = divided + offset;
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+ } else {
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+ if (remainder > itemHeight / 2) {
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+ position = divided + offset + 1;
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+ }
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+ }
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+
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+ int childSize = views.getChildCount();
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+ for (int i = 0; i < childSize; i++) {
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+ TextView itemView = (TextView) views.getChildAt(i);
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+ if (null == itemView) {
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+ return;
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+ }
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+ if (position == i) {
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+ itemView.setTextColor(Color.parseColor("#FF333333"));
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+ } else {
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+ itemView.setTextColor(Color.parseColor("#FF999999"));
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+ }
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+ }
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+ }
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+
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+ /**
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+ * 获取选中区域的边界
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+ */
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+ int[] selectedAreaBorder;
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+
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+ private int[] obtainSelectedAreaBorder() {
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+ if (null == selectedAreaBorder) {
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+ selectedAreaBorder = new int[2];
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+ selectedAreaBorder[0] = itemHeight * offset;
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+ selectedAreaBorder[1] = itemHeight * (offset + 1);
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+ }
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+ return selectedAreaBorder;
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+ }
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+
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+
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+ private int scrollDirection = -1;
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+ private static final int SCROLL_DIRECTION_UP = 0;
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+ private static final int SCROLL_DIRECTION_DOWN = 1;
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+
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+ Paint paint;
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+ int viewWidth;
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+
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+ @Override
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+ public void setBackground(Drawable background) {
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+
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+ if (viewWidth == 0) {
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+ viewWidth = getWidth();
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+ Log.d(TAG, "viewWidth: " + viewWidth);
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+ }
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+
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+ if (null == paint) {
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+ paint = new Paint();
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+ paint.setColor(Color.parseColor("#FF0B57C7"));
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+ paint.setStrokeWidth(dip2px(1f));
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+ }
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+
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+ background = new Drawable() {
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+ @Override
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+ public void draw(Canvas canvas) {
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+ canvas.drawLine(0, obtainSelectedAreaBorder()[0], viewWidth, obtainSelectedAreaBorder()[0], paint);
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+ canvas.drawLine(0, obtainSelectedAreaBorder()[1], viewWidth, obtainSelectedAreaBorder()[1], paint);
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+ }
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+
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+ @Override
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+ public void setAlpha(int alpha) {
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+
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+ }
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+
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+ @Override
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+ public void setColorFilter(ColorFilter cf) {
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+
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+ }
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+
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+ @Override
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+ public int getOpacity() {
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+ return PixelFormat.UNKNOWN;
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+ }
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+ };
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+
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+
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+ super.setBackground(background);
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+
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+ }
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+
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+ @Override
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+ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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+ super.onSizeChanged(w, h, oldw, oldh);
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+ Log.d(TAG, "w: " + w + ", h: " + h + ", oldw: " + oldw + ", oldh: " + oldh);
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+ viewWidth = w;
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+ setBackground(null);
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+ }
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+
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+ /**
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+ * 选中回调
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+ */
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+ private void onSeletedCallBack() {
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+ if (null != onWheelViewListener) {
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+ onWheelViewListener.onSelected(selectedIndex, items.get(selectedIndex));
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+ }
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+
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+ }
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+
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+ public void setSeletion(int position) {
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+ final int p = position;
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+ selectedIndex = p + offset;
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+ this.post(new Runnable() {
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+ @Override
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+ public void run() {
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+ WheelView.this.smoothScrollTo(0, p * itemHeight);
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+ }
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+ });
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+
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+ }
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+
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+ public String getSeletedItem() {
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+ return items.get(selectedIndex);
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+ }
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+
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+ public int getSeletedIndex() {
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+ return selectedIndex - offset;
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+ }
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+
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+
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+ @Override
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+ public void fling(int velocityY) {
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+ super.fling(velocityY / 3);
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+ }
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+
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+ @Override
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+ public boolean onTouchEvent(MotionEvent ev) {
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+ if (ev.getAction() == MotionEvent.ACTION_UP) {
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+
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+ startScrollerTask();
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+ }
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+ return super.onTouchEvent(ev);
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+ }
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+
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+ private OnWheelViewListener onWheelViewListener;
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+
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+ public OnWheelViewListener getOnWheelViewListener() {
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+ return onWheelViewListener;
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+ }
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+
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+ public void setOnWheelViewListener(OnWheelViewListener onWheelViewListener) {
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+ this.onWheelViewListener = onWheelViewListener;
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+ }
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+
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+ private int dip2px(float dpValue) {
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+ final float scale = getContext().getResources().getDisplayMetrics().density;
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+ return (int) (dpValue * scale + 0.5f);
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+ }
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+
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+ private int getViewMeasuredHeight(View view) {
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+ int width = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
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+ int expandSpec = View.MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, View.MeasureSpec.AT_MOST);
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+ view.measure(width, expandSpec);
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+ return view.getMeasuredHeight();
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+ }
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+
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+}
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+
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