Android(安卓)ViewPager实现Tabhost选项卡底部滑块动态滑动过渡

《Android ViewPager实现Tabhost选项卡底部滑块动态滑动过渡》

之前基于github上的第三方开源控件ViewPagerIndicator的UnderlinePageIndicator（原文链接：http://blog.csdn.net/zhangphil/article/details/44752213），自己写了一个底部带有滑块、且当ViewPager页面切换时候选项卡也随之相应切换，且滑块也随之相应动态滑动效果得控件。但写的太过于紧耦合，不利于复用，所以现在重构了代码，重写了代码，把这些效果做成了一个自定制的松耦合控件：TabLinearLayout，该控件可以在未来的项目中直接拿出使用。

控件效果图如图所示：

测试用的MainActivity.java：

package zhangphil.view;import java.util.ArrayList;import zhangphil.underline.R;import com.viewpagerindicator.UnderlinePageIndicator;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.ActionBarActivity;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.TextView;import android.content.Context;import android.graphics.Color;import android.os.Bundle;/** * 基于第三方开源控件ViewPagerIndicator的UnderlinePageIndicator，自己写的一个在选项卡底部有衬线的滑动控件。 * 控件效果图如图所示。 这里面有一个特别的效果是：头部的选项卡在ViewPager切换过程中，底部的滑块也随之动态渐渐滑动过渡。 *  * */public class MainActivity extends ActionBarActivity {private TabLinearLayout mTabLinearLayout;private ArrayList mArryList;private ViewPager mPager;// 未被选中的选项卡字体颜色private int COLOR_NORMAL = Color.DKGRAY;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mArryList = new ArrayList();// 初始化5个Fragment作为测试。for (int i = 0; i < 5; i++) {TestFragment f = (TestFragment) TestFragment.newInstance();f.id = i;mArryList.add(f);}PagerAdapter mAdapter = new MyFragmentAdapter(getSupportFragmentManager());mPager = (ViewPager) findViewById(R.id.pager);mPager.setAdapter(mAdapter);UnderlinePageIndicator mIndicator = (UnderlinePageIndicator) findViewById(R.id.indicator);mIndicator.setViewPager(mPager);mIndicator.setFades(false);mIndicator.setSelectedColor(0xff33B5E5);mTabLinearLayout = (TabLinearLayout) findViewById(R.id.tab_LinearLayout);ArrayAdapter mTabLinearLayoutAdapter = new MyTabLinearLayoutAdapter(this, -1);mTabLinearLayout.initialization(mPager, mTabLinearLayoutAdapter,mIndicator);}private class MyTabLinearLayoutAdapter extends ArrayAdapter {private Context context;public MyTabLinearLayoutAdapter(Context context, int resource) {super(context, resource);this.context = context;}@Overridepublic int getCount() {return mArryList.size();}// 在这里仅仅返回一个TextView作为选项卡的View。// 此处可以返回更丰富的View。@Overridepublic View getView(int position, View convertView, ViewGroup parent) {TextView v = new TextView(context);v.setGravity(Gravity.CENTER);v.setText("选项卡" + position);v.setTextColor(COLOR_NORMAL);return v;}}// 仅仅用于测试的Fragment，用一个id标识。private static class TestFragment extends Fragment {public int id;public static Fragment newInstance() {return new TestFragment();}public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {TextView v = new TextView(getActivity());v.setGravity(Gravity.CENTER);v.setTextSize(50f);v.setText("Fragment: " + id);return v;}}private class MyFragmentAdapter extends FragmentPagerAdapter {public MyFragmentAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int position) {return mArryList.get(position);}@Overridepublic int getCount() {return mArryList.size();}}}

MainActivity.java需要的activity_main.xml布局文件：

<?xml version="1.0" encoding="utf-8"?>

自己重写的TabLinearLayout.java：

package zhangphil.view;import com.viewpagerindicator.PageIndicator;import android.content.Context;import android.graphics.Color;import android.support.v4.view.ViewPager;import android.util.AttributeSet;import android.view.View;import android.widget.ArrayAdapter;import android.widget.LinearLayout;import android.widget.TextView;public class TabLinearLayout extends LinearLayout {private int COLOR_NORMAL = Color.DKGRAY;private ArrayAdapter mAtapter;private ViewPager mPager;private TabLinearLayoutListener mTabLinearLayoutListener;public TabLinearLayout(Context context, AttributeSet attrs) {super(context, attrs);}public TabLinearLayout(Context context) {super(context);}public void initialization(ViewPager mPager, ArrayAdapter mAtapter,PageIndicator mPageIndicator) {this.mAtapter = mAtapter;this.mPager = mPager;mPageIndicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageSelected(int pos) {setCurrentItem(pos);if (mTabLinearLayoutListener != null)mTabLinearLayoutListener.onTab(pos);}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageScrollStateChanged(int arg0) {}});// 添加选项卡addIndicators();// 初始化，第0项被选中setIndicatorViewSelected(0);}public void initialization(ViewPager mPager, ArrayAdapter mAtapter,PageIndicator mPageIndicator,TabLinearLayoutListener mTabLinearLayoutListener) {this.mTabLinearLayoutListener = mTabLinearLayoutListener;initialization(mPager, mAtapter, mPageIndicator);}// 添加Tab选项卡private void addIndicators() {for (int i = 0; i < mAtapter.getCount(); i++) {View v = mAtapter.getView(i, null, null);addIndicatorItem(v, i);}}// 在这里设置被选中时候选项卡变化的效果private void setIndicatorViewSelected(int pos) {for (int i = 0; i < super.getChildCount(); i++) {if (i == pos) {View v = super.getChildAt(i);TextView tv = (TextView) v;// Android Holo 样式的蓝色tv.setTextColor(0xff33B5E5);} else {View v = super.getChildAt(i);TextView tv = (TextView) v;tv.setTextColor(COLOR_NORMAL);}}}// 在线性布局里面依次添加一个View，为添加的View添加事件。private void addIndicatorItem(View view, final int index) {LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.MATCH_PARENT, 1);super.addView(view, index, params);view.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// 当用户点击该View时候，设置ViewPager正确而Pager Itemif (mTabLinearLayoutListener != null)mTabLinearLayoutListener.onTab(v, index);// 设置ViewPager的显示项。mPager.setCurrentItem(index, true);setCurrentItem(index);}});}// 设置当前LinearLayout的pos项子view被选中。public void setCurrentItem(int pos) {setIndicatorViewSelected(pos);}// 一个接口，当用户点击选项卡时候，方法被回调。public interface TabLinearLayoutListener {public void onTab(View v, int pos);public void onTab(int pos);}}

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