ViewPage多页面切换+Cursor图片随手指一起移动

package com.demo; import java.math.BigDecimal; import java.util.ArrayList; import java.util.Currency; import java.util.List; import android.app.Activity; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.DisplayMetrics; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.view.animation.Animation; import android.view.animation.TranslateAnimation; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; /** * Tab页面手势滑动切换以及动画效果 * * @author D.Winter * */ public class MainActivity extends Activity { private ViewPager mPager;// 页卡内容 private List<View> listViews; // Tab页面列表 private ImageView cursor;// 动画图片 private TextView t1, t2, t3;// 页卡头标 private int currIndex = 0;// 当前页卡编号 private int bmpW;// 动画图片宽度 /** 修正值 **/ int offValue = 0; /** 按钮触发 **/ private boolean byBtn = false; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); InitImageView(); InitTextView(); InitViewPager(); } /** * 初始化头标 */ private void InitTextView() { t1 = (TextView) findViewById(R.id.text1); t2 = (TextView) findViewById(R.id.text2); t3 = (TextView) findViewById(R.id.text3); t1.setOnClickListener(new MyOnClickListener(0)); t2.setOnClickListener(new MyOnClickListener(1)); t3.setOnClickListener(new MyOnClickListener(2)); } /** * 初始化ViewPager */ private void InitViewPager() { mPager = (ViewPager) findViewById(R.id.vPager); listViews = new ArrayList<View>(); LayoutInflater mInflater = getLayoutInflater(); listViews.add(mInflater.inflate(R.layout.lay1, null)); listViews.add(mInflater.inflate(R.layout.lay2, null)); listViews.add(mInflater.inflate(R.layout.lay3, null)); mPager.setAdapter(new MyPagerAdapter(listViews)); mPager.setCurrentItem(0); mPager.setOnPageChangeListener(new MyOnPageChangeListener()); } /** * 初始化动画 */ private void InitImageView() { cursor = (ImageView) findViewById(R.id.cursor); bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.a) .getWidth();// 获取图片宽度 DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); int screenW = dm.widthPixels;// 获取分辨率宽度 bmpW = screenW / 3; LayoutParams lp = cursor.getLayoutParams(); lp.width = bmpW; cursor.setLayoutParams(lp); // 滑动的修正值 offValue = new BigDecimal( getResources().getDisplayMetrics().widthPixels / 120.0) .setScale(0, BigDecimal.ROUND_HALF_UP).intValue(); } /** * ViewPager适配器 */ public class MyPagerAdapter extends PagerAdapter { public List<View> mListViews; public MyPagerAdapter(List<View> mListViews) { this.mListViews = mListViews; } @Override public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView(mListViews.get(arg1)); } @Override public void finishUpdate(View arg0) { } @Override public int getCount() { return mListViews.size(); } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(mListViews.get(arg1), 0); return mListViews.get(arg1); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == (arg1); } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) { } } private int clickIndex = 0; /** * 头标点击监听 */ public class MyOnClickListener implements View.OnClickListener { private int index = 0; public MyOnClickListener(int i) { index = i; } @Override public void onClick(View v) { clickIndex = index; mPager.setCurrentItem(index); } }; /** * 页卡切换监听 */ public class MyOnPageChangeListener implements OnPageChangeListener { // int ci = 0; @Override public void onPageSelected(int arg0) { currIndex = arg0; } int _arg2 = 0; @Override public void onPageScrolled(int arg0, float arg1, int arg2) { if (byBtn) { // } else { if (_arg2 == 0) { _arg2 = arg2; } else { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) cursor .getLayoutParams(); int moveOffset = 0; if (arg2 > _arg2) { moveOffset = arg2 - _arg2 + offValue; } else { if (arg2 - _arg2 != -(getResources() .getDisplayMetrics().widthPixels - 1)) { moveOffset = arg2 - _arg2 - offValue; } } _arg2 = arg2; if (Math.abs(clickIndex - currIndex) == 2) { moveOffset += moveOffset; } if (lp.leftMargin + moveOffset / 3 < 0) { lp.leftMargin = 0; } else if (lp.leftMargin + moveOffset / 3 > bmpW * 2) { lp.leftMargin = bmpW * 2; } else { lp.leftMargin = lp.leftMargin + moveOffset / 3; } cursor.setLayoutParams(lp); } } } @Override public void onPageScrollStateChanged(int arg0) { // 当滚动结束，重新定位一下 if (_arg2 == 0) { clickIndex=currIndex; if (currIndex == 0) { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) cursor .getLayoutParams(); lp.leftMargin = 0; cursor.setLayoutParams(lp); } else if (currIndex == 1) { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) cursor .getLayoutParams(); lp.leftMargin = bmpW; cursor.setLayoutParams(lp); } else { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) cursor .getLayoutParams(); lp.leftMargin = bmpW * 2; cursor.setLayoutParams(lp); } } } } }