Android兩級聯動實現選擇性別
阿新 • • 發佈：2019-02-12
實現二級聯動選擇性別功能
首先自定義Dialog
private Dialog upSex;style檔案private void selectSex() { upSex = new Dialog(MyInformationActivity.this, R.style.dialog); View defaultView = LayoutInflater.from(this).inflate( R.layout.picker_dialog, null); PickerView picker = (PickerView) defaultView.findViewById(R.id.pickerView); Button finish = (Button) defaultView .findViewById(R.id.finish); Button cancel = (Button) defaultView .findViewById(R.id.cancel); List<String> data = new ArrayList<String>(); data.add("男"); data.add("女"); picker.setData(data); picker.setOnSelectListener(new PickerView.onSelectListener() { @Override public void onSelect(String text) { UserSex = text; } }); finish.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { upSex.dismiss(); //網路請求將選擇的性別儲存到伺服器 String service = USER_REGISTER; String api = SAVE_INFORMATION; RequestParams params = new RequestParams(); params.put("sex", UserSex); ServiceCallBackString callback = new ServiceCallBackString() { @Override public void onFailure(int code, String response) { errorOpt(code); } @Override public void onSuccess(int code, String response) { Log.e("SEX", "onSuccess: "+ response); tv_my_sex.setText(UserSex); } }; new ServiceCaller().callService(service, api, params, callback); } }); cancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { upSex.dismiss(); } }); upSex.setContentView(defaultView); upSex.setCancelable(true); upSex.setCanceledOnTouchOutside(false); upSex.show(); WindowManager windowManager = MyInformationActivity.this.getWindowManager(); Display display = windowManager.getDefaultDisplay(); WindowManager.LayoutParams lp = upSex.getWindow().getAttributes(); lp.width = (int) (display.getWidth()); upSex.getWindow().setAttributes(lp); upSex.getWindow().setGravity(Gravity.BOTTOM); }
<style name="dialog" parent="@android:style/Theme.Dialog"> <item name="android:windowFrame">@null</item> <item name="android:windowFullscreen">true</item> <item name="android:windowIsFloating">true</item> <item name="android:windowIsTranslucent">true</item> <item name="android:windowNoTitle">true</item> <item name="android:background">@null</item> <item name="android:backgroundDimEnabled">true</item> <item name="android:windowBackground">@android:color/transparent</item> </style>
layout佈局檔案
自定義PickerView<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:background="#fff"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="5dp"> <Button android:id="@+id/cancel" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="36dp" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:layout_marginLeft="15dp" android:textColor="@color/colorDialogTextBlue" android:background="@null" android:text="取消" /> <Button android:id="@+id/finish" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="36dp" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:textColor="@color/colorDialogTextBlue" android:layout_marginRight="15dp" android:background="@null" android:text="完成" /> </RelativeLayout> //自定義View <com.***.***.view.PickerView android:id="@+id/pickerView" android:layout_width="match_parent" android:layout_height="80dp" /> </LinearLayout>
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Paint.FontMetricsInt;
import android.graphics.Paint.Style;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
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 = 1.5f;
/**
* 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 = 80;
private float mMinTextSize = 60;
private float mMaxTextAlpha = 255;
private float mMinTextAlpha = 120;
private int mColorText = 0x4bb1ed;
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
// 這裡mMoveLen / Math.abs(mMoveLen)是為了保有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();
}
/**
* 選擇選中的item的index
*
* @param selected
*/
public void setSelected(int selected)
{
mCurrentSelected = selected;
int distance = mDataList.size() / 2 - mCurrentSelected;
if (distance < 0)
for (int i = 0; i < -distance; i++)
{
moveHeadToTail();
mCurrentSelected--;
}
else if (distance > 0)
for (int i = 0; i < distance; i++)
{
moveTailToHead();
mCurrentSelected++;
}
invalidate();
}
/**
* 選擇選中的內容
*
* @param mSelectItem
*/
public void setSelected(String mSelectItem)
{
for (int i = 0; i < mDataList.size(); i++)
if (mDataList.get(i).equals(mSelectItem))
{
setSelected(i);
break;
}
}
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();
// 按照View的高度計算字型大小
mMaxTextSize = mViewHeight / 4.0f;
mMinTextSize = mMaxTextSize / 1.2f;
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)
{
// 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.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.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);
}
}成功了,效果下圖
