Android实现滑动刻度尺效果，选择身高体重和生日

刻度尺效果虽然看起来很美，我个人认为很不实用，即使再不实用，也有用的，鉴于群里成员对我的苦苦哀求，我就分享一个他用不到的，横屏滑动刻度尺，因为他需要竖屏的，哈哈……

最近群里的开发人员咨询怎样实现刻度尺的滑动效果去选择身高体重等信息。我倒是做过这种效果，貌似群里要的那个开发者要竖着的刻度尺，那我就先分享个横着的刻度尺滑动选择效果。哈哈……我就是这么贱，贱贱的才惹人爱嘛！好了，不逗了，先给个横着的效果，自己试着去改编或者修改一下，看看通过自己的能力能不能做出竖着的效果来，过两天我再把竖着的那个滑动选择效果分享出来。废话不多说了，上代码。

效果图：

第一步：activity_mian.xml布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/tab_blue"
    android:gravity="center_vertical"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="10dp" >

        <LinearLayout
            android:id="@+id/two"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:orientation="vertical" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="出生年"
                android:textColor="@color/white"
                android:textSize="16sp" />

            <TextView
                android:id="@+id/user_birth_value"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:layout_marginTop="5dp"
                android:text="1972"
                android:textColor="@color/white"
                android:textSize="18sp"
                android:textStyle="bold" />
        </LinearLayout>

        <HorizontalScrollView
            android:id="@+id/birthruler"
            android:layout_width="fill_parent"
            android:layout_height="60dp"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:layout_toRightOf="@id/two"
            android:background="@drawable/birthday_ruler"
            android:scrollbars="none" >

            <LinearLayout
                android:id="@+id/ruler_layout"
                android:layout_width="wrap_content"
                android:layout_height="fill_parent"
                android:gravity="center_vertical"
                android:orientation="horizontal" >
            </LinearLayout>
        </HorizontalScrollView>
    </RelativeLayout>

</LinearLayout>

第二步：水平空白刻度布局，blankhrulerunit.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="100dp"
    android:layout_height="fill_parent"
    android:layout_marginBottom="20dp"
    android:background="@null"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/hrulerunit"
        android:layout_width="100dp"
        android:layout_height="20dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:background="@null"
        android:textColor="@color/white"
        android:textSize="14sp" />

</RelativeLayout>

第三步：中间刻度尺布局，hrulerunit.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_marginBottom="20dp"
    android:orientation="vertical" >

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="25dp"
        android:layout_marginTop="3dp"
        android:background="@null"
        android:contentDescription="@null"
        android:scaleType="fitXY"
        android:src="@drawable/rulerscale_horizontal" />

    <TextView
        android:id="@+id/hrulerunit"
        android:layout_width="wrap_content"
        android:layout_height="20dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:background="@null"
        android:textColor="@color/white"
        android:textSize="14sp" />

</RelativeLayout>

第四步：MainActivity.java主代码实现：

package net.loonggg.rulerdemo;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
    private HorizontalScrollView ruler;
    private LinearLayout rulerlayout, all_layout;
    private TextView user_birth_value;
    private int beginYear;

    private String birthyear = "1970";
    private long time = 0;
    private int screenWidth;
    private boolean isFirst = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        user_birth_value = (TextView) findViewById(R.id.user_birth_value);
        user_birth_value.setText("1970");
        ruler = (HorizontalScrollView) findViewById(R.id.birthruler);
        rulerlayout = (LinearLayout) findViewById(R.id.ruler_layout);
        ruler.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                int action = event.getAction();
                user_birth_value.setText(String.valueOf(beginYear
                        + (int) Math.ceil((ruler.getScrollX()) / 20)));
                switch (action) {
                case MotionEvent.ACTION_DOWN:
                case MotionEvent.ACTION_MOVE:
                    break;
                case MotionEvent.ACTION_UP:
                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            user_birth_value.setText(String.valueOf(beginYear
                                    + (int) Math.ceil((ruler.getScrollX()) / 20)));
                            birthyear = String.valueOf((int) (beginYear + Math
                                    .ceil((ruler.getScrollX()) / 20)));
                            try {
                                time = (new SimpleDateFormat("yyyy")
                                        .parse(String.valueOf(birthyear)))
                                        .getTime();
                            } catch (ParseException e) {
                                e.printStackTrace();
                            }
                        }
                    }, 1000);
                    break;
                }
                return false;
            }

        });
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (isFirst) {
            screenWidth = ruler.getWidth();
            constructRuler();
            isFirst = false;
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                scroll();
            }
        }, 100);
    }

    private void scroll() {
        ruler.smoothScrollTo((1970 - beginYear) * 20, 0);
    }

    @SuppressWarnings("deprecation")
    private void constructRuler() {
        int year = new Date().getYear();
        if (year < 2015)
            year = 2010;
        beginYear = year / 10 * 10 - 150;
        View leftview = (View) LayoutInflater.from(this).inflate(
                R.layout.blankhrulerunit, null);
        leftview.setLayoutParams(new LayoutParams(screenWidth / 2,
                LayoutParams.MATCH_PARENT));
        rulerlayout.addView(leftview);
        for (int i = 0; i < 16; i++) {
            View view = (View) LayoutInflater.from(this).inflate(
                    R.layout.hrulerunit, null);
            view.setLayoutParams(new LayoutParams(200,
                    LayoutParams.MATCH_PARENT));
            TextView tv = (TextView) view.findViewById(R.id.hrulerunit);
            tv.setText(String.valueOf(beginYear + i * 10));
            rulerlayout.addView(view);
        }
        View rightview = (View) LayoutInflater.from(this).inflate(
                R.layout.blankhrulerunit, null);
        rightview.setLayoutParams(new LayoutParams(screenWidth / 2,
                LayoutParams.MATCH_PARENT));
        rulerlayout.addView(rightview);
    }

}

索要源码的方式很简单，跟以前一样，在公众号“非著名程序员”里回复关键字“刻度尺”即可获得。欢迎大家关注，转发和分享。