自定义文本选择器
PickerView.png
调用showPopupWindow 传入有一个View 上下文Context，文本字符串String[]
String[] strings=new String[new Random().nextInt(50)+10];
for (int i = 0; i PopupWindow 显示
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.PopupWindow;
import android.widget.Scroller;
import android.widget.TextView;
import com.app.framework.R;
public class PickerViewPop {
private PopupWindow popupWindow;
public PickerViewPop showPopupWindow(View view, Context context, String[] str) {
// 一个自定义的布局，作为显示的内容
View contentView = LayoutInflater.from(context).inflate(
R.layout.picker_view, null);
// 设置按钮的点击事件
setContentView(contentView, str);
popupWindow = new PopupWindow(contentView,
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);
popupWindow.setTouchable(true);
popupWindow.setTouchInterceptor(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.i("mengdd", "onTouch : ");
return false;
// 这里如果返回true的话，touch事件将被拦截
// 拦截后 PopupWindow的onTouchEvent不被调用，这样点击外部区域无法dismiss
}
});
// 如果不设置PopupWindow的背景，无论是点击外部区域还是Back键都无法dismiss弹框
popupWindow.setBackgroundDrawable(new BitmapDrawable());
// 设置好参数之后再show
popupWindow.showAsDropDown(view);
return this;
}
public interface OnPickerViewListen {
void OnConfirm(int index, String text);
}
private OnPickerViewListen onPickerViewListen;
public void setOnPickerViewListen(OnPickerViewListen onPickerViewListen) {
this.onPickerViewListen = onPickerViewListen;
}
public void setContentView(View contentView, final String[] str) {
final PickerView pickerView = (PickerView) contentView.findViewById(R.id.picker_view);
TextView confirm = (TextView) contentView.findViewById(R.id.confirm);
confirm.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(onPickerViewListen!=null){
int index=pickerView.getSelectedTextIndex();
onPickerViewListen.OnConfirm(index,str[index]);
popupWindow.dismiss();
}
}
});
pickerView.setTextString(str);
}
}
自定义的文本选择器
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import com.app.framework.utils.DipToPx;
import java.math.BigDecimal;
/**
* 滚动选择器
* 布局设置的高度必须能被weight 整除， 否则会有偏差
*/
public class PickerView extends View {
private String TAG = "PickerView";
/**
* 数据
*/
private String[] strings = new String[]{};
/**
* 控件宽度
*/
private int mViewWidth;
/**
* 控件高度
*/
private int mViewHeight;
/**
* 文本画笔
*/
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
/**
* 中间线画笔
*/
private Paint mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
/**
* 中间线边距
*/
private int linePading = 10;
/**
* 绘制文字大小
*/
private int textSezi = 14;
/**
* 中间线的厚度
*/
private float lineWidth = 1;
/**
* 选中的颜色
*/
private int checkedColor = 0xFFFF0000;
/**
* 未选中的颜色
*/
private int notCheckedColor = 0xFF000000;
/**
* 看见的条目数量,必须奇数
*/
private int weight = 5;
private int itemHeight;
/**
* 当前的位置
*/
private int index;
/**
* 默认选中中间位置
*/
private int defaultIndex = -1;
private int checkedIndex = (weight - 1) / 2;
private float mMoveLen;
public PickerView(Context context) {
super(context);
init();
}
/**
* 设置默认选中位置
*/
public void setDefaultIndex(int defaultIndex) {
this.defaultIndex = defaultIndex;
}
public PickerView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public PickerView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mViewHeight = getMeasuredHeight();
mViewWidth = getMeasuredWidth();
itemHeight = mViewHeight / weight;
if (defaultIndex == -1) {
/**设置默认中间位置*/
defaultIndex = strings.length / 2;
}
mMoveLen = -itemHeight * (defaultIndex - (weight - 1) / 2);
this.index = defaultIndex;
}
/**
* 设置整个控件可视条目数量
*/
public void setWeight(int weight) {
this.weight = weight;
}
/**
* 获取选中的位置
*/
public int getSelectedTextIndex() {
return index;
}
/**
* 设置text文本数组
*/
public void setTextString(String[] strings) {
this.strings = strings;
}
private void setSelectedText(int index) {
this.index = index;
}
/**
* 设置绘制文字大小
*/
public void setTextSezi(int textSezi) {
this.textSezi = textSezi;
}
/**
* 设置绘制中间线边距
*/
public void setLinePading(int linePading) {
this.linePading = linePading;
}
/**
* 设置中间线的厚度
*/
public void setLineWidth(float lineWidth) {
this.lineWidth = lineWidth;
}
/**
* 设置选中时的文本颜色
*/
public void setCheckedColor(int checkedColor) {
this.checkedColor = checkedColor;
}
/***设置未选中时的文本颜色*/
public void setNotCheckedColor(int notCheckedColor) {
this.notCheckedColor = notCheckedColor;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**绘制文字*/
drwaText(canvas);
/**绘制中间线*/
drwaLine(canvas);
}
/**
* 绘制文字
*
* @param canvas
*/
private void drwaText(Canvas canvas) {
for (int i = 0; i < strings.length; i++) {
/**绘制可视范围文本*/
if (i + weight -1 > index && i - weight+1 < index) {
if (i == index) {
mPaint.setColor(checkedColor);
} else {
mPaint.setColor(notCheckedColor);
}
Paint.FontMetrics metrics = mPaint.getFontMetrics();
float textHeight = metrics.descent; //文字高度
canvas.drawText(strings[i], mViewWidth / 2, itemHeight * (i + 1) - itemHeight / 2 + mMoveLen + textHeight, mPaint);
}
}
}
/**
* 绘制中间线
*/
private void drwaLine(Canvas canvas) {
int pading = DipToPx.dip2px(linePading);
canvas.drawLine(pading, itemHeight * checkedIndex, getRight() - pading, itemHeight * checkedIndex, mLinePaint);
canvas.drawLine(pading, itemHeight * (checkedIndex + 1), getRight() - pading, itemHeight * (checkedIndex + 1), mLinePaint);
}
/**
* 初始化画笔
*/
private void init() {
mPaint.setStyle(Paint.Style.FILL);
mPaint.setTextAlign(Paint.Align.CENTER);//绘制文本横向居中
mPaint.setTextSize(DipToPx.dip2px(textSezi));
mLinePaint.setStyle(Paint.Style.FILL);
mLinePaint.setTextAlign(Paint.Align.CENTER);
mLinePaint.setStrokeWidth(lineWidth);
}
/**
* 更新画笔参数
*/
public void updatePaint() {
init();
invalidate();
}
@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 doUp(MotionEvent event) {
float indexes = mMoveLen / itemHeight;
/**四舍五入 来判定离哪个位置较近*/
BigDecimal dex = new BigDecimal(indexes).setScale(0, BigDecimal.ROUND_HALF_UP);
float newIndex = dex.floatValue();
mMoveLen = newIndex * itemHeight;
int location;
/*限制角标0的移动范围*/
if (newIndex >= checkedIndex + 1) {
mMoveLen = checkedIndex * itemHeight;
}
/*限制最后一个单位的移动 移动范围*/
if (newIndex <= -(strings.length - checkedIndex - 1)) {
mMoveLen = -((strings.length - checkedIndex - 1) * itemHeight);
}
// Log.i("newIndex",newIndex+"");
/**防止选中角标越界*/
if (newIndex >= 0) {
location = (int) (checkedIndex - newIndex);
if (newIndex >= checkedIndex + 1) {
location = 0;
}
} else {
location = (int) (Math.abs(newIndex) + checkedIndex);
if (location > strings.length - 1) {
location = strings.length - 1;
}
}
/**滑动停止的时候设置当前选中的 是第几个*/
setSelectedText(location);
invalidate();
}
private void doMove(MotionEvent event) {
int location;
mMoveLen += (event.getY() - mLastDownY);
mLastDownY = event.getY();
float indexes = mMoveLen / itemHeight;
/**四舍五入 来判定离哪个位置较近*/
BigDecimal dex = new BigDecimal(indexes).setScale(0, BigDecimal.ROUND_HALF_UP);
float newIndex = dex.floatValue();
/**防止选中角标越界*/
if (newIndex >= 0) {
location = (int) (checkedIndex - newIndex);
if (newIndex >= checkedIndex + 1) {
location = 0;
}
} else {
location = (int) (Math.abs(newIndex) + checkedIndex);
if (location > strings.length - 1) {
location = strings.length - 1;
}
}
setSelectedText(location);
invalidate();
}
private float mLastDownY;
private void doDown(MotionEvent event) {
mLastDownY = event.getY();
}
}
布局文件 picker_view