ViewPager+Fragment实现无限加载
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ViewPager+Fragment在开发中也是非常常见的，今天有空总结下，方便以后使用，下面是总结： 
MainActivity.class
package com.example.viewpager_fragment_demo;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.util.DisplayMetrics;import android.view.LayoutInflater;import android.view.ViewGroup.LayoutParams;import android.view.animation.LinearInterpolator;import android.view.animation.TranslateAnimation;import android.widget.ImageView;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.RelativeLayout;import android.widget.RadioGroup.OnCheckedChangeListener;import com.example.viewpager_fragment_demo.fragment.CommonUIFragment;import com.example.viewpager_fragment_demo.fragment.LaunchUIFragment;import com.example.viewpager_fragment_demo.fragment.SpecialUIFragment;import com.example.viewpager_fragment_demo.view.SyncHorizontalScrollView;public class MainActivity extends FragmentActivity { public static final String ARGUMENTS_NAME = "arg"; private RelativeLayout rl_nav; private SyncHorizontalScrollView mHsv;//水平的标题 private RadioGroup rg_nav_content; private ImageView iv_nav_indicator; private ImageView iv_nav_left; private ImageView iv_nav_right; private ViewPager mViewPager; private int indicatorWidth; // 指示器宽度 private LayoutInflater mInflater; private TabFragmentPagerAdapter mAdapter; private int currentIndicatorLeft = 0; public static String[] tabTitle = { "选项1", "选项2", "选项3", "选项4", "选项5","选项6", "选项7" }; // 标题 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(); initView(); setListener(); } private void findViewById() { rl_nav = (RelativeLayout) findViewById(R.id.rl_nav); mHsv = (SyncHorizontalScrollView) findViewById(R.id.mHsv); rg_nav_content = (RadioGroup) findViewById(R.id.rg_nav_content); iv_nav_indicator = (ImageView) findViewById(R.id.iv_nav_indicator); iv_nav_left = (ImageView) findViewById(R.id.iv_nav_left); iv_nav_right = (ImageView) findViewById(R.id.iv_nav_right); mViewPager = (ViewPager) findViewById(R.id.mViewPager); } private void initView() { DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); // 获取屏幕信息 indicatorWidth = dm.widthPixels / 4;// 指示器宽度为屏幕宽度的4/1 LayoutParams cursor_Params = iv_nav_indicator.getLayoutParams(); cursor_Params.width = indicatorWidth;// 初始化滑动下标的宽 iv_nav_indicator.setLayoutParams(cursor_Params); mHsv.setSomeParam(rl_nav, iv_nav_left, iv_nav_right, this, dm.widthPixels); // 获取布局填充器 mInflater = (LayoutInflater) this .getSystemService(LAYOUT_INFLATER_SERVICE); initNavigationHSV(); mAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager()); mViewPager.setAdapter(mAdapter); mViewPager.setOffscreenPageLimit(0);//ViewPager预加载，0时加载，1不加载 } /** * 设置选择的标题 */ private void initNavigationHSV() { rg_nav_content.removeAllViews(); for (int i = 0; i < tabTitle.length; i++) { RadioButton rb = (RadioButton) mInflater.inflate( R.layout.nav_radiogroup_item, null); rb.setId(i); rb.setText(tabTitle[i]); rb.setLayoutParams(new LayoutParams(indicatorWidth, LayoutParams.MATCH_PARENT)); rg_nav_content.addView(rb); } } public class TabFragmentPagerAdapter extends FragmentPagerAdapter { public TabFragmentPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int arg) { Fragment ft = null; switch (arg) { //当前选择的页的下标 case 0: ft = new LaunchUIFragment();//第一页 break; case 2: ft = new SpecialUIFragment(MainActivity.this);//有登陆 break; default: ft = new CommonUIFragment(); Bundle args = new Bundle(); args.putString(ARGUMENTS_NAME, tabTitle[arg]); ft.setArguments(args); break; } return ft; } @Override public int getCount() { return tabTitle.length; } } private void setListener() { mViewPager.setOnPageChangeListener(new OnPageChangeListener() { //页面跳转完后得到调用，arg0是你当前选中的页面的Position（位置编号）。 @Override public void onPageSelected(int position) { if (rg_nav_content != null&& rg_nav_content.getChildCount() > position) {//标题当前可见的个数大于position ((RadioButton) rg_nav_content.getChildAt(position)).performClick(); } } //滑动时调用 /** * arg0 :当前页面，及你点击滑动的页面 arg1:当前页面偏移的百分比 arg2:当前页面偏移的像素位置 */ @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } /** * 此方法是在状态改变的时候调用，其中arg0这个参数有三种状态（0，1，2）。 * arg0 ==1的时辰默示正在滑动，arg0==2的时辰默示滑动完毕了，arg0==0的时辰默示什么都没做。 */ @Override public void onPageScrollStateChanged(int arg0) { } }); //内容的选择，选择 rg_nav_content.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (rg_nav_content.getChildAt(checkedId) != null) { /** * Android JDK为我们提供了4种动画效果，分别是： AlphaAnimation,RotateAnimation, ScaleAnimation, TranslateAnimation. * TranslateAnimation的参数如下 * float fromXDelta:这个参数表示动画开始的点离当前View X坐标上的差值； float toXDelta, 这个参数表示动画结束的点离当前View X坐标上的差值； float fromYDelta, 这个参数表示动画开始的点离当前View Y坐标上的差值； float toYDelta)这个参数表示动画开始的点离当前View Y坐标上的差值； */ TranslateAnimation animation = new TranslateAnimation(currentIndicatorLeft, ((RadioButton) rg_nav_content.getChildAt(checkedId)).getLeft(), 0f, 0f); animation.setInterpolator(new LinearInterpolator());//设置动画的执行速率 animation.setDuration(100); animation.setFillAfter(true); // 执行位移动画 iv_nav_indicator.startAnimation(animation); mViewPager.setCurrentItem(checkedId); // ViewPager // 跟随一起 切换 // 记录当前 下标的距最左侧的 距离 currentIndicatorLeft = ((RadioButton) rg_nav_content .getChildAt(checkedId)).getLeft(); //当前视图内容偏移 mHsv.smoothScrollTo( (checkedId > 1 ? ((RadioButton) rg_nav_content.getChildAt(checkedId)).getLeft(): 0) - ((RadioButton) rg_nav_content.getChildAt(2)).getLeft(), 0); } } }); }}CommonUIFragment.class
package com.example.viewpager_fragment_demo.fragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.example.viewpager_fragment_demo.MainActivity;import com.example.viewpager_fragment_demo.R;public class CommonUIFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_selection_common, container, false); TextView tv_tabName = (TextView) rootView.findViewById(R.id.tv_tabName); Bundle bundle = getArguments(); tv_tabName.setText(bundle.getString(MainActivity.ARGUMENTS_NAME, "")); return rootView; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); }}LaunchUIFragment.class
package com.example.viewpager_fragment_demo.fragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.example.viewpager_fragment_demo.R;public class LaunchUIFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_selection_launch, container, false); return rootView; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); }}SpecialUIFragment.class
package com.example.viewpager_fragment_demo.fragment;import android.content.Context;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.Toast;import com.example.viewpager_fragment_demo.R;public class SpecialUIFragment extends Fragment { private Context context; public SpecialUIFragment(Context context) { this.context = context; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_selection_special, container, false); Button btn = (Button) view.findViewById(R.id.login); btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Toast.makeText(context, "登录成功", Toast.LENGTH_SHORT).show(); } }); return view; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); }}SyncHorizontalScrollView.class
package com.example.viewpager_fragment_demo.view;import android.app.Activity;import android.content.Context;import android.util.AttributeSet;import android.view.View;import android.widget.HorizontalScrollView;import android.widget.ImageView;public class SyncHorizontalScrollView extends HorizontalScrollView { public SyncHorizontalScrollView(Context context) { super(context); } public SyncHorizontalScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public SyncHorizontalScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } private View view; private ImageView leftImage;// 左标图片 private ImageView rightImage;// 右标图片 private int windowWitdh = 0;// 屏幕宽度 private Activity mContext; public void setSomeParam(View view, ImageView iv_nav_left, ImageView iv_nav_right, Activity context, int widthPixels) { this.view = view; this.mContext = context; this.leftImage = iv_nav_left; this.rightImage = iv_nav_right; this.windowWitdh = widthPixels; } // 显示和隐藏左右两边的箭头 public void showAndHideArrow() { if (!mContext.isFinishing() && view != null) { this.measure(0, 0); if (windowWitdh >= this.getMeasuredWidth()) { leftImage.setVisibility(View.GONE); rightImage.setVisibility(View.GONE); } else { if (this.getLeft() == 0) { leftImage.setVisibility(View.GONE); rightImage.setVisibility(View.VISIBLE); } else if (this.getRight() == this.getMeasuredWidth() - windowWitdh) { leftImage.setVisibility(View.VISIBLE); rightImage.setVisibility(View.GONE); } else { leftImage.setVisibility(View.VISIBLE); rightImage.setVisibility(View.VISIBLE); } } } } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt); if (!mContext.isFinishing() && view != null && rightImage != null && leftImage != null) { if (view.getWidth() <= windowWitdh) { leftImage.setVisibility(View.GONE); rightImage.setVisibility(View.GONE); } else { if (l == 0) { leftImage.setVisibility(View.GONE); rightImage.setVisibility(View.VISIBLE); } else if (view.getWidth() - l == windowWitdh) { leftImage.setVisibility(View.VISIBLE); rightImage.setVisibility(View.GONE); } else { leftImage.setVisibility(View.VISIBLE); rightImage.setVisibility(View.VISIBLE); } } } }}rb_blue_bg.xml
<?xml version="1.0" encoding="UTF-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_checked="true" android:color="#5AB0EB"/> <item android:state_checked="false" android:color="#000000"/></selector>nav_radiogroup_item.xml
<?xml version="1.0" encoding="utf-8"?><RadioButton xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="0dip" android:layout_height="fill_parent" android:background="#F2F2F2" android:button="@null" android:checked="true" android:gravity="center" android:text="" android:textColor="@drawable/rb_blue_bg" android:textSize="14.0dip" />fragment_selection_launch.xml
<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/tv_intro" android:layout_width="300dp" android:layout_height="wrap_content" android:layout_marginBottom="16dp" android:layout_marginTop="20dp" android:text="@string/launch_intro" /> <Button android:id="@+id/bt_click" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="16dp" android:text="@string/launch_click_me" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button1" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button2" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button3" /> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button4" /> <Button android:id="@+id/button4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button5" /> <Button android:id="@+id/button5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button6" /> <Button android:id="@+id/button6" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button7" /> <Button android:id="@+id/button7" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button8" /> <Button android:id="@+id/button8" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button9" /> </LinearLayout></ScrollView>fragment_selection_common.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" > <TextView android:layout_width="300dp" android:layout_height="wrap_content" android:textSize="18sp" android:text="@string/common_intro" /> <TextView android:id="@+id/tv_tabName" android:layout_marginTop="30dp" android:layout_width="wrap_content" android:layout_height="30dp" android:layout_gravity="center" android:textSize="20sp" /></LinearLayout>activity_main.xml
<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" tools:context="${packageName}.${activityClass}" > <RelativeLayout android:id="@+id/rl_tab" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#F2F2F2" > <com.example.viewpager_fragment_demo.view.SyncHorizontalScrollView android:id="@+id/mHsv" android:layout_width="fill_parent" android:layout_height="40dip" android:fadingEdge="none" android:scrollbars="none" > <RelativeLayout android:id="@+id/rl_nav" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="top" android:background="#5AB0EB" > <RadioGroup android:id="@+id/rg_nav_content" android:layout_width="fill_parent" android:layout_height="38dip" android:layout_alignParentTop="true" android:background="#F2F2F2" android:orientation="horizontal" > </RadioGroup> <ImageView android:id="@+id/iv_nav_indicator" android:layout_width="1dip" android:layout_height="5dip" android:layout_alignParentBottom="true" android:background="#5AB0EB" android:contentDescription="@string/nav_desc" android:scaleType="matrix" /> </RelativeLayout> </com.example.viewpager_fragment_demo.view.SyncHorizontalScrollView> <ImageView android:id="@+id/iv_nav_left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:contentDescription="@string/nav_desc" android:paddingBottom="1dip" android:src="@drawable/iv_navagation_scroll_left" android:visibility="gone" > </ImageView> <ImageView android:id="@+id/iv_nav_right" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:contentDescription="@string/nav_desc" android:paddingBottom="1dip" android:src="@drawable/iv_navagation_scroll_right" android:visibility="visible" > </ImageView> </RelativeLayout> <android.support.v4.view.ViewPager android:id="@+id/mViewPager" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_below="@id/rl_tab" android:layout_gravity="center" android:background="#ffffff" android:flipInterval="30" android:persistentDrawingCache="animation" /></RelativeLayout>fragment_selection_special.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" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <TextView android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> <EditText android:id="@+id/EditText01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> <EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" /> </LinearLayout> <Button android:id="@+id/login" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="登录" /></LinearLayout>资源文件 
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