Android仿主流壁纸App设置界面

<?xml version="1.0" encoding="utf-8"? 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/viewpager_ll"
 android:layout_width="match_parent"
 android:layout_height="match_parent"  
 
 <com.dighammer.slidewallpaper.DigHorizontalScrollView
 android:id="@+id/hs"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:fillViewport="true"
 android:scrollbars="none"  
 
 <ImageView
 android:id="@+id/iv"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_alignParentLeft="true"
 android:layout_alignParentTop="true"
 android:scaleType="fitXY"
 android:src="@drawable/cat" / 
 </com.dighammer.slidewallpaper.DigHorizontalScrollView 
 
 <SeekBar
 android:id="@+id/seekBar"
 android:layout_width="@dimen/seekbar_width"
 android:layout_height="@dimen/seekbar_height"
 android:layout_alignParentBottom="true"
 android:layout_centerHorizontal="true"
 android:layout_marginBottom="@dimen/seekbar_margin"
 android:background="@drawable/setting_wallpaper_seekbar_bg"
 android:paddingLeft="@dimen/seekbar_padding"
 android:paddingRight="@dimen/seekbar_padding"
 android:progressDrawable="@drawable/progress_bg"
 android:thumb="@drawable/setting_wallpaper_seekbar_slider" / 
 
</RelativeLayout 

package com.dighammer.slidewallpaper;
 
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
 
/**
 * 
 * @author DigHammer
 * */
public class MainActivity extends ActionBarActivity implements
 OnGlobalLayoutListener, OnSeekBarChangeListener {
 
 private DigHorizontalScrollView mHScrollView;
 private SeekBar mSeekBar;
 private ImageView mImageView;
 Handler mHandler = new Handler();
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 mHScrollView = (DigHorizontalScrollView) findViewById(R.id.hs);
 mSeekBar = (SeekBar) findViewById(R.id.seekBar);
 mImageView = (ImageView) findViewById(R.id.iv);
 // ImageView图片设置完成的监听事件
 ViewTreeObserver vto = mImageView.getViewTreeObserver();
 vto.addOnGlobalLayoutListener(this);
 mSeekBar.setOnSeekBarChangeListener(this);
 }
 
 @Override
 public void onProgressChanged(SeekBar seekBar, int progress,
 boolean fromUser) {
 // 图片随着SeekBar滑动而滑动
 mHScrollView.smoothScrollTo(progress, 0);
 }
 
 @Override
 public void onStartTrackingTouch(SeekBar seekBar) {
 // TODO Auto-generated method stub
 
 }
 
 @Override
 public void onStopTrackingTouch(SeekBar seekBar) {
 // TODO Auto-generated method stub
 
 final int max = Integer.valueOf(mSeekBar.getTag().toString());
 // 设置滑块永远居中
 if (mSeekBar.getProgress() != max / 2) {
 // 加runnable是为了使滚动条平滑滚动
 mSeekBar.setProgress(max / 2);
 Runnable r = new Runnable() {
 @Override
 public void run() {
 mHScrollView.smoothScrollTo(max / 2, 0);
 }
 };
 mHandler.postDelayed(r, 100);
 }
 
 }
 
 @Override
 public void onGlobalLayout() {
 // TODO Auto-generated method stub
 
 WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
 int wmWidth = wm.getDefaultDisplay().getWidth();
 int imageWidth = mImageView.getWidth();
 // 比较图片的宽度和屏幕的宽度
 if (imageWidth <= wmWidth) {
 mSeekBar.setVisibility(View.GONE);
 } else {
 mSeekBar.setVisibility(View.VISIBLE);
 }
 int max = imageWidth - wmWidth;
 // 保存max
 mSeekBar.setTag(max);
 // 设置sekbar初始位置
 mSeekBar.setMax(max);
 mSeekBar.setProgress(max / 2);
 // 让图片居中显示
 mHScrollView.scrollTo(max / 2, 0);
 
 }
}