Android實現滑動刻度尺效果
最近群里的開發人員咨詢怎樣實現刻度尺的滑動效果去選擇身高體重等信息。給個橫著的效果，自己試著去改編或者修改一下，看看通過自己的能力能不能做出豎著的效果來，過兩天我再把豎著的那個滑動選擇效果分享出來。廢話不多說了，上代碼。
效果圖如下:
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: 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: 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: 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: 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: 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：中間刻度尺布局，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='http://www.gepszalag.com/bcjs/@drawable/rulerscale_horizontal' /><TextView android: 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主代碼實現：
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; @Overrideprotected 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; } });}@Overridepublic void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); if (isFirst) { screenWidth = ruler.getWidth(); constructRuler(); isFirst = false; }}@Overrideprotected 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);}}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。
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