利用ViewPagerIndicator制作带指示器的顶部导航
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今日在网上找了一个带有不错指示器效果的ViewPager,稍微做了改动,拿来与大家分享一下,也是借助网上的ViewPagerIndicator这个框架来做的,废话少说,上代码:
一致惯例,先上布局文件:
<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/app_name" /></RelativeLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:li="http://schemas.android.com/apk/res/com.example.viewpager" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ffffffff" android:orientation="vertical" > <com.example.viewpager.ViewPagerIndicator android:id="@+id/id_indicator" android:layout_width="match_parent" android:layout_height="45dp" android:background="@color/colorAccent" android:orientation="horizontal" li:item_count="3" > <TextView android:layout_width="0dp" android:layout_height="fill_parent" android:layout_weight="1" android:gravity="center" android:text="短信1" android:textColor="#CCFFFFFF" android:textSize="16sp" /> <TextView android:layout_width="0dp" android:layout_height="fill_parent" android:layout_weight="1" android:gravity="center" android:text="收藏2" android:textColor="#CCFFFFFF" android:textSize="16sp" /> <TextView android:layout_width="0dp" android:layout_height="fill_parent" android:layout_weight="1" android:gravity="center" android:text="推荐3" android:textColor="#CCFFFFFF" android:textSize="16sp" /> </com.example.viewpager.ViewPagerIndicator> <android.support.v4.view.ViewPager android:id="@+id/id_vp" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" > </android.support.v4.view.ViewPager></LinearLayout>
ViewPagerIndicator的代码:
package com.example.viewpager;import java.util.List;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.CornerPathEffect;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Path;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.util.TypedValue;import android.view.Gravity;import android.view.View;import android.view.WindowManager;import android.widget.LinearLayout;import android.widget.TextView;/** * http://blog.csdn.net/lmj623565791/article/details/42160391 * @author zhy * */public class ViewPagerIndicator extends LinearLayout { /** * 绘制三角形的画笔 */ private Paint mPaint; /** * path构成一个三角形 */ private Path mPath; /** * 三角形的宽度 */ private int mTriangleWidth; /** * 三角形的高度 */ private int mTriangleHeight; /** * 三角形的宽度为单个Tab的1/6 */ private static final float RADIO_TRIANGEL = 1.0f / 6; /** * 三角形的最大宽度 */ private final int DIMENSION_TRIANGEL_WIDTH = (int) (getScreenWidth() / 3 * RADIO_TRIANGEL); /** * 初始时,三角形指示器的偏移量 */ private int mInitTranslationX; /** * 手指滑动时的偏移量 */ private float mTranslationX; /** * 默认的Tab数量 */ private static final int COUNT_DEFAULT_TAB = 4; /** * tab数量 */ private int mTabVisibleCount = COUNT_DEFAULT_TAB; /** * tab上的内容 */ private List<String> mTabTitles; /** * 与之绑定的ViewPager */ public ViewPager mViewPager; /** * 标题正常时的颜色 */ private static final int COLOR_TEXT_NORMAL = 0x77FFFFFF; /** * 标题选中时的颜色 */ private static final int COLOR_TEXT_HIGHLIGHTCOLOR = 0xFFFFFFFF; public ViewPagerIndicator(Context context) { this(context, null); } public ViewPagerIndicator(Context context, AttributeSet attrs) { super(context, attrs); // 获得自定义属性,tab的数量 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewPagerIndicator); mTabVisibleCount = a.getInt(R.styleable.ViewPagerIndicator_item_count, COUNT_DEFAULT_TAB); if (mTabVisibleCount < 0) mTabVisibleCount = COUNT_DEFAULT_TAB; a.recycle(); // 初始化画笔 mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setColor(Color.parseColor("#ffffffff")); mPaint.setStyle(Style.FILL); mPaint.setPathEffect(new CornerPathEffect(3)); } /** * 绘制指示器 */ @Override protected void dispatchDraw(Canvas canvas) { canvas.save(); // 画笔平移到正确的位置 canvas.translate(mInitTranslationX + mTranslationX, getHeight() + 1); canvas.drawPath(mPath, mPaint); canvas.restore(); super.dispatchDraw(canvas); } /** * 初始化三角形的宽度 */ @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mTriangleWidth = (int) (w / mTabVisibleCount * RADIO_TRIANGEL);// 1/6 of // width mTriangleWidth = Math.min(DIMENSION_TRIANGEL_WIDTH, mTriangleWidth); // 初始化三角形 initTriangle(); // 初始时的偏移量 mInitTranslationX = getWidth() / mTabVisibleCount / 2 - mTriangleWidth / 2; } /** * 设置可见的tab的数量 * * @param count */ public void setVisibleTabCount(int count) { this.mTabVisibleCount = count; } /** * 设置tab的标题内容 可选,可以自己在布局文件中写死 * * @param datas */ public void setTabItemTitles(List<String> datas) { // 如果传入的list有值,则移除布局文件中设置的view if (datas != null && datas.size() > 0) { this.removeAllViews(); this.mTabTitles = datas; for (String title : mTabTitles) { // 添加view addView(generateTextView(title)); } // 设置item的click事件 setItemClickEvent(); } } /** * 对外的ViewPager的回调接口 * * @author zhy * */ public interface PageChangeListener { public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels); public void onPageSelected(int position); public void onPageScrollStateChanged(int state); } // 对外的ViewPager的回调接口 private PageChangeListener onPageChangeListener; // 对外的ViewPager的回调接口的设置 public void setOnPageChangeListener(PageChangeListener pageChangeListener) { this.onPageChangeListener = pageChangeListener; } // 设置关联的ViewPager public void setViewPager(ViewPager mViewPager, int pos) { this.mViewPager = mViewPager; mViewPager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int position) { // 设置字体颜色高亮 resetTextViewColor(); highLightTextView(position); // 回调 if (onPageChangeListener != null) { onPageChangeListener.onPageSelected(position); } } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { // 滚动 scroll(position, positionOffset); // 回调 if (onPageChangeListener != null) { onPageChangeListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(int state) { // 回调 if (onPageChangeListener != null) { onPageChangeListener.onPageScrollStateChanged(state); } } }); // 设置当前页 mViewPager.setCurrentItem(pos); // 高亮 highLightTextView(pos); } /** * 高亮文本 * * @param position */ protected void highLightTextView(int position) { View view = getChildAt(position); if (view instanceof TextView) { ((TextView) view).setTextColor(COLOR_TEXT_HIGHLIGHTCOLOR); } } /** * 重置文本颜色 */ private void resetTextViewColor() { for (int i = 0; i < getChildCount(); i++) { View view = getChildAt(i); if (view instanceof TextView) { ((TextView) view).setTextColor(COLOR_TEXT_NORMAL); } } } /** * 设置点击事件 */ public void setItemClickEvent() { int cCount = getChildCount(); for (int i = 0; i < cCount; i++) { final int j = i; View view = getChildAt(i); view.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mViewPager.setCurrentItem(j); } }); } } /** * 根据标题生成我们的TextView * * @param text * @return */ private TextView generateTextView(String text) { TextView tv = new TextView(getContext()); LayoutParams lp = new LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); lp.width = getScreenWidth() / mTabVisibleCount; tv.setGravity(Gravity.CENTER); tv.setTextColor(COLOR_TEXT_NORMAL); tv.setText(text); tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16); tv.setLayoutParams(lp); return tv; } /** * 初始化三角形指示器 */ private void initTriangle() { mPath = new Path(); mTriangleHeight = (int) (mTriangleWidth / 2 / Math.sqrt(2)); mPath.moveTo(0, 0); mPath.lineTo(mTriangleWidth, 0); mPath.lineTo(mTriangleWidth / 2, -mTriangleHeight); mPath.close(); } /** * 指示器跟随手指滚动,以及容器滚动 * * @param position * @param offset */ public void scroll(int position, float offset) { /** * <pre> * 0-1:position=0 ;1-0:postion=0; * </pre> */ // 不断改变偏移量,invalidate mTranslationX = getWidth() / mTabVisibleCount * (position + offset); int tabWidth = getScreenWidth() / mTabVisibleCount; // 容器滚动,当移动到倒数最后一个的时候,开始滚动 if (offset > 0 && position >= (mTabVisibleCount - 2) && getChildCount() > mTabVisibleCount) { if (mTabVisibleCount != 1) { this.scrollTo((position - (mTabVisibleCount - 2)) * tabWidth + (int) (tabWidth * offset), 0); } else // 为count为1时 的特殊处理 { this.scrollTo( position * tabWidth + (int) (tabWidth * offset), 0); } } invalidate(); } /** * 设置布局中view的一些必要属性;如果设置了setTabTitles,布局中view则无效 */ @Override protected void onFinishInflate() { Log.e("TAG", "onFinishInflate"); super.onFinishInflate(); int cCount = getChildCount(); if (cCount == 0) return; for (int i = 0; i < cCount; i++) { View view = getChildAt(i); LayoutParams lp = (LayoutParams) view .getLayoutParams(); lp.weight = 0; lp.width = getScreenWidth() / mTabVisibleCount; view.setLayoutParams(lp); } // 设置点击事件 setItemClickEvent(); } /** * 获得屏幕的宽度 * * @return */ public int getScreenWidth() { WindowManager wm = (WindowManager) getContext().getSystemService( Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); return outMetrics.widthPixels; }}
Activity:
package com.example.viewpager;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Window;import java.util.ArrayList;import java.util.Arrays;import java.util.List;public class MainActivity extends AppCompatActivity { private List<Fragment> mTabContents = new ArrayList<>(); private FragmentPagerAdapter mAdapter; private ViewPager mViewPager; private List<String> mDatas = Arrays.asList("短信1", "短信2", "短信3"); private ViewPagerIndicator mIndicator; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.vp_indicator); initView(); initDatas(); //设置Tab上的标题 mIndicator.setTabItemTitles(mDatas); mViewPager.setAdapter(mAdapter); //设置关联的ViewPager mIndicator.setViewPager(mViewPager, 0); } private void initView() { mViewPager = (ViewPager) findViewById(R.id.id_vp); mIndicator = (ViewPagerIndicator) findViewById(R.id.id_indicator); } private void initDatas() { /* for (String data : mDatas) { VpSimpleFragment fragment = VpSimpleFragment.newInstance(data); mTabContents.add(fragment); }*/ //利用回调关联上三个fragment VpSimpleFragment fragment = VpSimpleFragment.newInstance(); mTabContents.add(fragment); BlankFragment fragment1=BlankFragment.newInstance(); mTabContents.add(fragment1); lankFragment fragment2=lankFragment.newInstance(); mTabContents.add(fragment2); mAdapter = new FragmentPagerAdapter(getSupportFragmentManager()) { @Override public int getCount() { return mTabContents.size(); } @Override public Fragment getItem(int position) { return mTabContents.get(position); } }; }}
最后就是三个Fragment:
public class BlankFragment extends Fragment { public BlankFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_blank, container, false); } public static BlankFragment newInstance() { BlankFragment fragment = new BlankFragment(); return fragment; }}
三个写法都一样,就只写一个了。
效果图如下:
demo下载地址:http://download.csdn.net/detail/kuaizilanqiu/9601316
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