Android实现滑动刻度尺效果

<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 

<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 

<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 

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);
}
}