Android两级联动实现选择性别

实现二级联动选择性别功能

首先自定义Dialog

private Dialog upSex;

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();                //网络请求将选择的性别保存到服务器                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文件

<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布局文件

<?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>    //自定义View    <com.***.***.view.PickerView        android:id="@+id/pickerView"        android:layout_width="match_parent"        android:layout_height="80dp" /></LinearLayout>

自定义PickerView

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之间间距和minTextSize之比 */public static final float MARGIN_ALPHA = 1.5f;/** * 自动回滚到中间的速度 */public static final float SPEED = 2;private List<String> mDataList;/** * 选中的位置，这个位置是mDataList的中心位置，一直不变 */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;/** * 滑动的距离 */private float mMoveLen = 0;private boolean isInit = false;private onSelectListener mSelectListener;private Timer timer;private MyTimerTask mTask;Handler updateHandler = new Handler(){@Overridepublic void handleMessage(Message msg){if (Math.abs(mMoveLen) < SPEED){mMoveLen = 0;if (mTask != null){mTask.cancel();mTask = null;performSelect();}} else// 这里mMoveLen / Math.abs(mMoveLen)是为了保有mMoveLen的正负号，以实现上滚或下滚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();}/** * 选择选中的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();}/** * 选择选中的内容 *  * @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);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){super.onMeasure(widthMeasureSpec, heightMeasureSpec);mViewHeight = getMeasuredHeight();mViewWidth = getMeasuredWidth();// 按照View的高度计算字体大小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);}@Overrideprotected void onDraw(Canvas canvas){super.onDraw(canvas);// 根据index绘制viewif (isInit)drawData(canvas);}private void drawData(Canvas canvas){// 先绘制选中的text再往上往下绘制其余的textfloat scale = parabola(mViewHeight / 4.0f, mMoveLen);float size = (mMaxTextSize - mMinTextSize) * scale + mMinTextSize;mPaint.setTextSize(size);mPaint.setAlpha((int) ((mMaxTextAlpha - mMinTextAlpha) * scale + mMinTextAlpha));// text居中绘制，注意baseline的计算才能达到居中，y值是text中心坐标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);// 绘制上方datafor (int i = 1; (mCurrentSelected - i) >= 0; i++){drawOtherText(canvas, i, -1);}// 绘制下方datafor (int i = 1; (mCurrentSelected + i) < mDataList.size(); i++){drawOtherText(canvas, i, 1);}}/** * @param canvas * @param position *            距离mCurrentSelected的差值 * @param type *            1表示向下绘制，-1表示向上绘制 */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);}/** * 抛物线 *  * @param zero *            零点坐标 * @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;}@Overridepublic 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){// 往下滑超过离开距离moveTailToHead();mMoveLen = mMoveLen - MARGIN_ALPHA * mMinTextSize;} else if (mMoveLen < -MARGIN_ALPHA * mMinTextSize / 2){// 往上滑超过离开距离moveHeadToTail();mMoveLen = mMoveLen + MARGIN_ALPHA * mMinTextSize;}mLastDownY = event.getY();invalidate();}private void doUp(MotionEvent event){// 抬起手后mCurrentSelected的位置由当前位置move到中间选中位置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;}@Overridepublic void run(){handler.sendMessage(handler.obtainMessage());}}public interface onSelectListener{void onSelect(String text);}}

成功了,效果下图