ViewPager+Fragment添加一行若干小红球滚动指示器指示当前ViewPager翻阅位置（可供第三方使用的类）

效果图如下：

ViewPager+Fragment添加一行若干小红球滚动指示器指示当前ViewPager翻阅位置（可供第三方使用的类）。

类似现在通用的新闻客户端头部，会放置几张图片供新闻阅读者翻阅，同时放置一行小圆球根据用户翻阅的位置相应的滚动，标识出当前第几页。

该项目开放出几个用以重载的方法函数供第三方使用：

protected Fragment getFragmentAt(int pos) {return null;}protected int getItemsCount() {return 0;}protected   String  getDescriptionAt(int pos){return    null;}

测试用的主MainActivity.java （不是重点，仅仅用以测试）

package zhangphil.viewpager_fragment;import java.util.ArrayList;
import java.util.Random;import com.example.viewpager_fragment.R;import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;public class MainActivity extends FragmentActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Fragment newFragment = new HowToUseThisView();FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();transaction.replace(R.id.fragment, newFragment);transaction.commit();}public static class HowToUseThisView extendsViewPagerAndFragmentWithCircleIndicator {private ArrayList<Fragment> mArrayList;// 主要用以标记Fragment，没特别意义private int id = 0;// ViewPager的元素个数。private int item_count = 0;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mArrayList = new ArrayList<Fragment>();// 测试用的。假设生成随机个数的Fragment。Random rand = new Random();item_count = rand.nextInt(10);}@Overrideprotected Fragment getFragmentAt(int pos) {Fragment fragment = null;try {fragment = mArrayList.get(pos);} catch (Exception e) {Log.d(this.getClass().getName(), "队列中不存在，创建新Fragment");}if (fragment == null) {fragment = new TestFragment();((TestFragment) fragment).setID(id++);mArrayList.add(fragment);}return fragment;}@Overrideprotected int getItemsCount() {return item_count;}@Overrideprotected String getDescriptionAt(int pos) {//实际使用过程中，可根据每个不同的Fragment返回不同的描述文本return pos + "";}}//// 仅仅用于测试的Fragment，在ViewPager中加载//public static class TestFragment extends Fragment {private int id = 0;public void setID(int id) {this.id = id;}public int getID() {return id;}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {TextView tv = new TextView(getActivity());String str = "序号: " + getID();tv.setTextColor(Color.LTGRAY);tv.setText(str);tv.setTextSize(60);tv.setGravity(Gravity.CENTER);return tv;}}
}

MainActivity.java所要的布局文件 activity_main.xml ：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><FrameLayout android:id="@+id/fragment"  android:layout_width="match_parent"android:layout_height="match_parent">  </FrameLayout></LinearLayout>

重点是 ViewPagerAndFragmentWithCircleIndicator.java

package zhangphil.viewpager_fragment;import com.example.viewpager_fragment.R;import zhangphil.libs.view.CircleIndicatorView;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;public class ViewPagerAndFragmentWithCircleIndicator extends Fragment {private MyFragmentPagerAdapter mPagerAdapter;private ViewPager mViewPager;private CircleIndicatorView mCircleIndicatorView;private    TextView circleIndicatorView_TextView;private Handler handler;private final int MESSAGE_WHAT_DRAW_CIRCLE = 100;public void notifyDataSetChanged() {mPagerAdapter.notifyDataSetChanged();}protected Fragment getFragmentAt(int pos) {return null;}protected int getItemsCount() {return 0;}protected    String  getDescriptionAt(int pos){return    null;}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View mView = inflater.inflate(R.layout.viewpager_fragment, null);mViewPager = (ViewPager) mView.findViewById(R.id.viewpager);mPagerAdapter = new MyFragmentPagerAdapter(getFragmentManager());mViewPager.setAdapter(mPagerAdapter);mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageSelected(int pos) {set(pos);}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageScrollStateChanged(int arg0) {}});mCircleIndicatorView = (CircleIndicatorView) mView.findViewById(R.id.circleIndicatorView);mCircleIndicatorView.drawCircleView(mPagerAdapter.getCount(), 0);//初始化红色小圆球的 位置和文本描述circleIndicatorView_TextView=(TextView) mView.findViewById(R.id.circleIndicatorView_TextView);circleIndicatorView_TextView.setText(getDescriptionAt(0));handler = new Handler() {public void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case MESSAGE_WHAT_DRAW_CIRCLE:mCircleIndicatorView.drawCircleView(mPagerAdapter.getCount(),mViewPager.getCurrentItem());break;}};};return mView;}private void set(int pos) {mViewPager.setCurrentItem(pos, true);circleIndicatorView_TextView.setText(getDescriptionAt(pos));handler.sendEmptyMessage(MESSAGE_WHAT_DRAW_CIRCLE);}private class MyFragmentPagerAdapter extends FragmentPagerAdapter {public MyFragmentPagerAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int pos) {return   getFragmentAt(pos);}@Overridepublic int getCount() {return getItemsCount();}@Overridepublic void notifyDataSetChanged() {super.notifyDataSetChanged();handler.sendEmptyMessage(MESSAGE_WHAT_DRAW_CIRCLE);}}
}

ViewPagerAndFragmentWithCircleIndicator.java需要的布局文件 viewpager_fragment.xml ：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><FrameLayout android:layout_weight="1"android:layout_width="match_parent"android:layout_height="match_parent" ><android.support.v4.view.ViewPagerandroid:id="@+id/viewpager"android:layout_width="match_parent"android:layout_height="match_parent" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="30dip"android:orientation="horizontal"android:layout_gravity="bottom" ><TextViewandroid:id="@+id/circleIndicatorView_TextView"android:layout_width="0dip"android:layout_height="match_parent"android:gravity="left"android:textColor="#FF0000"android:layout_weight="1"android:singleLine="true"android:text="" /><zhangphil.libs.view.CircleIndicatorViewandroid:id="@+id/circleIndicatorView"android:layout_width="0dip"android:layout_height="match_parent"android:layout_weight="0.382"/></LinearLayout></FrameLayout></LinearLayout>

以及用以绘制红色小圆球的 CircleIndicatorView.java

package zhangphil.libs.view;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;public class CircleIndicatorView extends View { public CircleIndicatorView(Context context, AttributeSet attrs){   super(context, attrs);  }private    int gap=20;//各个横向排列的小球间距public void    setCirlceGap(int gap){this.gap=gap;}public int getCirlceGap(){return   gap;}private    int padding=20;public  void    setPadding(int padding){this.padding=padding;}public   int getPadding(){return padding;}private    int circle_normal_radius=5; //普通小球半径public void    setNormalCircleRadius(int radius){this.circle_normal_radius=radius;}public int getNormalCircleRadius(){return  circle_normal_radius;}private   int circle_selected_radius=7; //被选择的小球半径public void setSelectedCircleRadius(int radius){this.circle_selected_radius=radius;} public   int getSelectedCircleRadius(){return    circle_selected_radius;}private int count=0;public void    setCircleCount(int count){this.count=count;}public int getCircleCount(){return count;}private  int pos=0;public   void    setCircleSelectedPosition(int pos){this.pos=pos;}public    int getCircleSelectedPosition(){return  pos;}public void    drawCircleView(){this.invalidate();}public  void    drawCircleView(int count,int circleSelectedPosition){setCircleCount(count);setCircleSelectedPosition(circleSelectedPosition);this.invalidate();}private int circleSelectedColor=Color.RED;public   void    setCircleSelectedColor(int color){circleSelectedColor=color;}public    int getCircleSelectedColor(){return circleSelectedColor;}private    int circleUnSelectedColor=Color.LTGRAY;public  void    setCircleUnSelectedColor(int color){circleUnSelectedColor=color;}public    int getCircleUnSelectedColor(){return   circleUnSelectedColor;}@Override  protected void onDraw(Canvas canvas) {  super.onDraw(canvas); Paint p = new Paint();  p.setAntiAlias(true);int w=this.getWidth();int h=this.getHeight();//因为是自右往左绘制小圆圈，需要转化pos的位置。int translate_pos=getCircleCount()-getCircleSelectedPosition()-1;//如果居中绘制则使用start_x，但需要依次递加x坐标轴位置值。//int start_x=(w-(CIRCLE_GAP*(getCircleCount()-1)))/2;for(int i=0;i<getCircleCount();i++){int r=getNormalCircleRadius();if(i==translate_pos){r=getSelectedCircleRadius();p.setColor(getCircleSelectedColor());}else{r=getNormalCircleRadius();p.setColor(getCircleUnSelectedColor()); }//自右向左绘制。从最右边往左边绘制小球//如果从该自定制的View左边绘制，直接将 x=0即可。canvas.drawCircle(w-i*getCirlceGap()-getPadding(), h/2, r, p);}}
}

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ViewPager+Fragment添加一行若干小红球滚动指示器指示当前ViewPager翻阅位置（可供第三方使用的类）

ViewPager+Fragment添加一行若干小红球滚动指示器指示当前ViewPager翻阅位置（可供第三方使用的类）相关推荐

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