最近，項(xiàng)目中需要添加一個(gè)橫向滾動選擇的控件焙格，本想偷個(gè)懶图毕，于是遍尋網(wǎng)上的各種博客，最終發(fā)現(xiàn)均不太合適眷唉。無奈予颤，只好硬著頭皮趕鴨子上架，擼起袖子就是干冬阳。
效果截圖如下：
image
廢話不多說蛤虐，直接上代碼。
package com.pal.othertrain.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.support.v7.widget.TintTypedArray;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import com.pal.othertrain.R;
import java.util.ArrayList;
import java.util.List;
public class HorizontalSelectedView extends View {
private Context context;
private List<String> strings;
private int seeSize;
private int anInt;
private TextPaint textPaint;
private boolean firstVisible;
private int width;
private int height;
private Paint selectedPaint;
private int index;
private float downX;
private float anOffset;
private float selectedTextSize;
private int selectedColor;
private float textSize;
private int textColor;
private Rect rect;
private int textWidth;
private int textHeight;
private int centerTextHeight;
public HorizontalSelectedView(Context context) {
this(context, (AttributeSet) null);
}
public HorizontalSelectedView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public HorizontalSelectedView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.strings = new ArrayList();
this.seeSize = 5;
this.firstVisible = true;
this.rect = new Rect();
this.textWidth = 0;
this.textHeight = 0;
this.centerTextHeight = 0;
this.context = context;
this.setWillNotDraw(false);
this.setClickable(true);
this.initAttrs(attrs);
this.initPaint();
}
private void initPaint() {
this.textPaint = new TextPaint(1);
this.textPaint.setTextSize(this.textSize);
this.textPaint.setColor(this.textColor);
this.selectedPaint = new TextPaint(1);
this.selectedPaint.setColor(this.selectedColor);
this.selectedPaint.setTextSize(this.selectedTextSize);
}
private void initAttrs(AttributeSet attrs) {
TintTypedArray tta = TintTypedArray.obtainStyledAttributes(this.getContext(), attrs, R.styleable.HorizontalselectedView);
this.seeSize = tta.getInteger(R.styleable.HorizontalselectedView_HorizontalselectedViewSeesize, 5);
this.selectedTextSize = tta.getFloat(R.styleable.HorizontalselectedView_HorizontalselectedViewSelectedTextSize, 50.0F);
this.selectedColor = tta.getColor(R.styleable.HorizontalselectedView_HorizontalselectedViewSelectedTextColor, this.context.getResources().getColor(17170444));
this.textSize = tta.getFloat(R.styleable.HorizontalselectedView_HorizontalselectedViewTextSize, 40.0F);
this.textColor = tta.getColor(R.styleable.HorizontalselectedView_HorizontalselectedViewTextColor, this.context.getResources().getColor(17170432));
}
public boolean onTouchEvent(MotionEvent event) {
Log.e("action", "onTouchEvent: " + event.getAction());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
this.downX = event.getX();
break;
case MotionEvent.ACTION_UP:
this.anOffset = 0.0F;
this.invalidate();
if (listener != null) {
listener.onSelect(getSelectedString(), index);
}
break;
case MotionEvent.ACTION_MOVE:
float scrollX = event.getX();
if (this.index != 0 && this.index != this.strings.size() - 1) {
this.anOffset = scrollX - this.downX;
} else {
this.anOffset = (float) ((double) (scrollX - this.downX) / 1.5D);
}
if (scrollX > this.downX) {
if (scrollX - this.downX >= (float) this.anInt && this.index > 0) {
this.anOffset = 0.0F;
--this.index;
this.downX = scrollX;
}
} else if (this.downX - scrollX >= (float) this.anInt && this.index < this.strings.size() - 1) {
this.anOffset = 0.0F;
++this.index;
this.downX = scrollX;
}
this.invalidate();
}
return super.onTouchEvent(event);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (this.firstVisible) {
this.width = this.getWidth();
this.height = this.getHeight();
this.anInt = this.width / this.seeSize;
this.firstVisible = false;
}
if (this.index >= 0 && this.index <= this.strings.size() - 1) {
String s = (String) this.strings.get(this.index);
this.selectedPaint.getTextBounds(s, 0, s.length(), this.rect);
int centerTextWidth = this.rect.width();
this.centerTextHeight = this.rect.height();
canvas.drawText((String) this.strings.get(this.index), (float) (this.getWidth() / 2 - centerTextWidth / 2) + this.anOffset, (float) (this.getHeight() / 2 + this.centerTextHeight / 2), this.selectedPaint);
for (int i = 0; i < this.strings.size(); ++i) {
if (this.index > 0 && this.index < this.strings.size() - 1) {
this.textPaint.getTextBounds((String) this.strings.get(this.index - 1), 0, ((String) this.strings.get(this.index - 1)).length(), this.rect);
int width1 = this.rect.width();
this.textPaint.getTextBounds((String) this.strings.get(this.index + 1), 0, ((String) this.strings.get(this.index + 1)).length(), this.rect);
int width2 = this.rect.width();
this.textWidth = (width1 + width2) / 2;
}
if (i == 0) {
this.textPaint.getTextBounds((String) this.strings.get(0), 0, ((String) this.strings.get(0)).length(), this.rect);
this.textHeight = this.rect.height();
}
if (i != this.index) {
canvas.drawText((String) this.strings.get(i), (float) ((i - this.index) * this.anInt + this.getWidth() / 2 - this.textWidth / 2) + this.anOffset, (float) (this.getHeight() / 2 + this.textHeight / 2), this.textPaint);
}
}
}
}
public void setSeeSize(int seeSizes) {
if (this.seeSize > 0) {
this.seeSize = seeSizes;
this.invalidate();
}
}
public void setAnLeftOffset() {
if (this.index < this.strings.size() - 1) {
++this.index;
this.invalidate();
}
}
public void setAnRightOffset() {
if (this.index > 0) {
--this.index;
this.invalidate();
}
}
public void setData(List<String> strings) {
this.strings = strings;
this.index = strings.size() / 2;
this.invalidate();
}
public String getSelectedString() {
return this.strings.size() != 0 ? (String) this.strings.get(this.index) : null;
}
private OnSelectListener listener;
public void setOnSelectListener(OnSelectListener listener) {
this.listener = listener;
}
public interface OnSelectListener {
void onSelect(String selectStr, int index);
}
}
horizontalselectedView_attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="HorizontalselectedView">
<attr name="HorizontalselectedViewSeesize" format="integer" />
<attr name="HorizontalselectedViewSelectedTextSize" format="float" />
<attr name="HorizontalselectedViewSelectedTextColor" format="color|reference" />
<attr name="HorizontalselectedViewTextSize" format="float" />
<attr name="HorizontalselectedViewTextColor" format="color|reference" />
</declare-styleable>
</resources>
大功告成肝陪，搞定驳庭，鳴金收兵。
