viewpage 添加fragment 报错 viewpage demo LayoutInflater 自定义控件轮播图demo-阿里云开发者社区

viewpage 添加fragment 报错

、

上面引入的Fragment 不对，导致报错

更换Fragment的依赖适应v4 或者androdx

viewpage demo

主要：main 的 layout 加viewpage ，新建fragment 加载fragment view；设定fragmentadpter.在main中使用viewpage设置adapter；

注意：在新建fragment的时候一定之一引入的fragment 的包。细心啊；

main：

package cuiweiyou.headerrecycleview;
import android.os.Bundle;
import android.widget.LinearLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.viewpager.widget.ViewPager;
import java.util.ArrayList;
import java.util.List;
import cuiweiyou.headerrecycleview.adapter.FragmentAdapter;
import cuiweiyou.headerrecycleview.adapter.HeaderRcyvAdapter;
import cuiweiyou.headerrecycleview.bean.HeaderBean;
import cuiweiyou.headerrecycleview.bean.NormalBean;
import cuiweiyou.headerrecycleview.fragment.FragmentOne;
/**
 * www.gaohaiyan.com
 */
public class MainActivityViewpage extends AppCompatActivity {
    private List<NormalBean> mNormalList = new ArrayList<NormalBean>(); // 普通item的数据集
    private HeaderBean mHeaderBean;                                     // header的数据
    private LinearLayout activityMain;
    private ViewPager vp;
    private List<Fragment> fragmentList = new ArrayList<>();
    private HeaderRcyvAdapter mHeaderRcyvAdapter;
    private FragmentAdapter fragmentAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_viewpage);
        vp = (ViewPager) findViewById(R.id.vp);
        FragmentOne fragment1 = new FragmentOne(MainActivityViewpage.this,"1");
        FragmentOne fragment2 = new FragmentOne(MainActivityViewpage.this,"12");
        FragmentOne fragment3 = new FragmentOne(MainActivityViewpage.this,"123");
        fragmentList.add(fragment1);
        fragmentList.add(fragment2);
        fragmentList.add(fragment3);
        fragmentAdapter = new FragmentAdapter(getSupportFragmentManager(), fragmentList, "1");
        vp.setAdapter(fragmentAdapter);
    }
}

fragment：

package cuiweiyou.headerrecycleview.fragment;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import cuiweiyou.headerrecycleview.R;
@SuppressLint("ValidFragment")
public class FragmentOne extends Fragment {
   private Context mContext;
   TextView tvHead ;
   String head;
    public FragmentOne(Context context,String s) {
        super();
        mContext=context;
        head=s;
    }
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable  ViewGroup container, Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment_one,null);
        tvHead = (TextView) view.findViewById(R.id.tv_head);
        tvHead.setText(head);
        return view;
    }
    @Override
    public void onViewCreated(View view, @Nullable  Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
    @Nullable
    @Override
    public View getView() {
        return super.getView();
    }
}

adapter:

package cuiweiyou.headerrecycleview.adapter;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import java.util.ArrayList;
import java.util.List;
public class FragmentAdapter extends FragmentPagerAdapter {
    private String tv_title;
    List<Fragment> mfragmentList=new ArrayList<>();
    public FragmentAdapter(FragmentManager fm, List<Fragment> fragmentList, String title) {
        super(fm);
        mfragmentList=fragmentList;
        tv_title = title;
    }
    @Override
    public Fragment getItem(int position) {
        return mfragmentList.get(position);
    }
    @Override
    public int getCount() {
        return mfragmentList.size();
    }
}

LayoutInflater

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tes="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/logo"
        android:text="张继群"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.425" />
</LinearLayout>

下面主要就是加载LayoutInflater，设定layout，加载layout；

LayoutInflater layoutInfla=LayoutInflater.from(this);
View view=layoutInfla.inflate(R.layout.ceshi,null);
ll_ceshi.addView(view);

public class MainActivity extends Activity {  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        RelativeLayout rly = new RelativeLayout(this);  
        Button btnOne = new Button(this);  
        btnOne.setText("按钮1");  
        Button btnTwo = new Button(this);  
        btnTwo.setText("按钮2");  
        // 为按钮1设置一个id值  
        btnOne.setId(123);  
        // 设置按钮1的位置,在父容器中居中  
        RelativeLayout.LayoutParams rlp1 = new RelativeLayout.LayoutParams(  
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);  
        rlp1.addRule(RelativeLayout.CENTER_IN_PARENT);  
        // 设置按钮2的位置,在按钮1的下方,并且对齐父容器右面  
        RelativeLayout.LayoutParams rlp2 = new RelativeLayout.LayoutParams(  
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);  
        rlp2.addRule(RelativeLayout.BELOW, 123);  
        rlp2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);  
        // 将组件添加到外部容器中  
        rly.addView(btnTwo, rlp2);  
        rly.addView(btnOne, rlp1);  
        // 设置当前视图加载的View即rly  
        setContentView(rly);  
    }  
}

自定义控件轮播图demo

1.获取网络地址的轮播图片。

public class BannerImg extends FrameLayout {
    private final static boolean isAutoPlay = true;
    private List<String> imageUris;
    private List<ImageView> imageViewsList;
    private List<ImageView> dotViewsList;
    private LinearLayout mLinearLayout;
    private ViewPager mViewPager;
    private int currentItem = 0;
    private ScheduledExecutorService scheduledExecutorService;
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            super.handleMessage(msg);
            mViewPager.setCurrentItem(currentItem);
        }
    };
    //使用ImageLoader加载网络图片
    ImageLoader imageLoader = ImageLoader.getInstance();
    DisplayImageOptions options = new DisplayImageOptions.Builder()
            .showImageForEmptyUri(R.mipmap.pic_one)
            .showImageOnFail(R.mipmap.pic_two)
            .showImageOnLoading(R.mipmap.pic_three)
            .resetViewBeforeLoading(true)
            .cacheOnDisk(true)
            .imageScaleType(ImageScaleType.EXACTLY)
            .bitmapConfig(Bitmap.Config.RGB_565)
            .considerExifParams(true)
            .displayer(new FadeInBitmapDisplayer(300)).build();
    public BannerImg(Context context) {
        this(context, null);
    }
    public BannerImg(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public BannerImg(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        initUI(context);
        if (!(imageUris.size() <= 0)) {
            setImageUris(imageUris);
        }
        if (isAutoPlay) {
            startPlay();
        }
    }
    private void initUI(Context context) {
        imageViewsList = new ArrayList<ImageView>();
        dotViewsList = new ArrayList<ImageView>();
        imageUris = new ArrayList<String>();
        LayoutInflater.from(context).inflate(R.layout.bannerimg, this, true);
        mLinearLayout = (LinearLayout) findViewById(R.id.dotsImg);
        mViewPager = (ViewPager) findViewById(R.id.imagePager);
        ImageLoaderConfiguration.Builder config = new ImageLoaderConfiguration.Builder(context);
        config.threadPriority(Thread.NORM_PRIORITY - 2);
        config.denyCacheImageMultipleSizesInMemory();
        config.diskCacheFileNameGenerator(new Md5FileNameGenerator());
        config.diskCacheSize(50 * 1024 * 1024); // 50 MiB
        config.tasksProcessingOrder(QueueProcessingType.LIFO);
        config.writeDebugLogs(); // Remove for release app
        // Initialize ImageLoader with configuration.
        imageLoader.init(config.build());
    }
    public void setImageUris(List<String> imageuris) {
        for (int i = 0; i < imageuris.size(); i++) {
            imageUris.add(imageuris.get(i));
        }
        for (int i = 0; i < imageUris.size(); i++) {
            ImageView imageView = new ImageView(getContext());
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);//铺满屏幕
            imageLoader.displayImage(imageUris.get(i), imageView, options, new SimpleImageLoadingListener() {
                @Override
                public void onLoadingStarted(String imageUri, View view) {
                }
                @Override
                public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                }
            });
            imageViewsList.add(imageView);
            ImageView viewDot = new ImageView(getContext());
            if (i == 0) {
                viewDot.setBackgroundResource(R.mipmap.dot_focus);
            } else {
                viewDot.setBackgroundResource(R.mipmap.dot);
            }
            dotViewsList.add(viewDot);
            mLinearLayout.addView(viewDot);
        }
        mViewPager.setFocusable(true);
        mViewPager.setAdapter(new MyPagerAdapter());
        mViewPager.setOnPageChangeListener(new MyPageChangeListener());
    }
    private void startPlay() {
        scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
        scheduledExecutorService.scheduleAtFixedRate(new BannerTask(), 1, 4, TimeUnit.SECONDS);
    }
    @SuppressWarnings("unused")
    private void stopPlay() {
        scheduledExecutorService.shutdown();
    }
    /**
     * 设置选中的圆点的背景
     *
     * @param selectItems
     */
    private void setImageBackground(int selectItems) {
        for (int i = 0; i < dotViewsList.size(); i++) {
            if (i == selectItems) {
                dotViewsList.get(i).setBackgroundResource(R.mipmap.dot_focus);
            } else {
                dotViewsList.get(i).setBackgroundResource(R.mipmap.dot);
            }
        }
    }
    private class MyPagerAdapter extends PagerAdapter {
        @Override
        public void destroyItem(View container, int position, Object object) {
            // TODO Auto-generated method stub
            //((ViewPag.er)container).removeView((View)object);
            ((ViewPager) container).removeView(imageViewsList.get(position));
        }
        @Override
        public Object instantiateItem(View container, int position) {
            // TODO Auto-generated method stub
            ((ViewPager) container).addView(imageViewsList.get(position));
            return imageViewsList.get(position);
        }
        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return imageViewsList.size();
        }
        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            // TODO Auto-generated method stub
            return arg0 == arg1;
        }
        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {
            // TODO Auto-generated method stub
        }
        @Override
        public Parcelable saveState() {
            // TODO Auto-generated method stub
            return null;
        }
    }
    private class MyPageChangeListener implements ViewPager.OnPageChangeListener {
        boolean isAutoPlay = false;
        @Override
        public void onPageScrollStateChanged(int arg0) {
            // TODO Auto-generated method stub
            switch (arg0) {
                case 1:
                    isAutoPlay = false;
                    break;
                case 2:
                    isAutoPlay = true;
                    break;
                case 0:
//          <span style="font-family: Arial, Helvetica, sans-serif;">                    //如果滑到最后，就从头开始</span>
//[java] view plain copy
                    if (mViewPager.getCurrentItem() == mViewPager.getAdapter().getCount() - 1 && !isAutoPlay) {
                        mViewPager.setCurrentItem(0);
                    }
                    //如果滑到头就从尾开始
                    else if (mViewPager.getCurrentItem() == 0 && !isAutoPlay) {
                        mViewPager.setCurrentItem(mViewPager.getAdapter().getCount() - 1);
                    }
                    break;
            }
        }
        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
            // TODO Auto-generated method stub
        }
        @Override
        public void onPageSelected(int pos) {
            // TODO Auto-generated method stub
            setImageBackground(pos);
        }
    }
    private class BannerTask implements Runnable {
        @Override
        public void run() {
            // TODO Auto-generated method stub
            synchronized (mViewPager) {
                currentItem = (currentItem + 1) % imageViewsList.size();
                handler.obtainMessage().sendToTarget();
            }
        }
    }
}

上面这是一个好用的类，实现轮播图，不过这是加载网络上的图片，不能加载本地的，下面我会提供一个本地加载的。

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">  
    <android.support.v4.view.ViewPager
    android:id="@+id/imagePager"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />  
    <LinearLayout
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/dotsImg"
    android:gravity="center_horizontal"
    android:layout_gravity="bottom|center_horizontal">  
    </LinearLayout>  
</FrameLayout>

这是布局文件。

<LinearLayout 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:orientation="vertical"
    android:background="@color/balack_thin"
    android:paddingBottom="10dp">
    <com.imobi.callblocker.util.BannerImg
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/mainBanner"></com.test.controls.BannerImg>
</LinearLayout>

上面是具体的应用。

@Override
public void onCreated(@Nullable Bundle savedInstanceState) {
    BannerImg bannerImg=(BannerImg)findViewById(R.id.mainBanner);
    List<String> imgs=new ArrayList<String>();
    imgs.add(0,"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1529508272189&di=0ddf122b1e41f10164d41553cafba0e9&imgtype=0&src=http%3A%2F%2Fimg.duoziwang.com%2F2016%2F12%2F18%2F015634128329.jpg");
    imgs.add(1,"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1529508291437&di=8232c28ca25526c2b57d8ac797cd62b9&imgtype=jpg&src=http%3A%2F%2Fimg2.imgtn.bdimg.com%2Fit%2Fu%3D2002181187%2C439438033%26fm%3D214%26gp%3D0.jpg");
    bannerImg.setImageUris(imgs);

上面是在你的具体用大的地方去输入你的资源文件。这个只能用于网络加载图片，具体是使用ImageLoder去解析网络地址。

具体如下：

DisplayImageOptions options = new DisplayImageOptions.Builder()
        .showImageForEmptyUri(R.mipmap.pic_one)
        .showImageOnFail(R.mipmap.pic_two)
        .showImageOnLoading(R.mipmap.pic_three)
        .resetViewBeforeLoading(true)
        .cacheOnDisk(true)
        .imageScaleType(ImageScaleType.EXACTLY)
        .bitmapConfig(Bitmap.Config.RGB_565)
        .considerExifParams(true)
        .displayer(new FadeInBitmapDisplayer(300)).build();

我相信你跟家具名字就能知道其中的意思。当url为空的时候，当loadfail的是时候等等。

2.接下来第二只用方法了：相当于自己写一个viewpage，用handle耗时去自动的滑动图片。

既可以加载本地图片的。

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginBottom="12dp"
    android:foregroundGravity="center"
    android:gravity="center"
    android:orientation="vertical">
    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp" />
      <LinearLayout
                android:id="@+id/viewGroup"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:gravity="center_horizontal|bottom"
                android:orientation="horizontal">
      </LinearLayout>
</RelativeLayot>

上面是具体的布局文件，接下来是具体的代码了，在相应的java文中。

@Override
    public void onCreated(@Nullable Bundle savedInstanceState) {
        initView();
    }
    private void initView() {
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent =new Intent(UnHookCallActivity.this, MainShowActivity.class);
                startActivity(intent);
            }
        });
        ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);
        vPager = (ViewPager) findViewById(R.id.viewPager);
        dots = new ImageView[img.length];
        for (int i = 0; i < dots.length; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setLayoutParams(new WindowManager.LayoutParams(10, 10));
            dots[i] = imageView;
            if (i == 0) {
                dots[i].setBackgroundResource(R.mipmap.dot_focus);
            } else {
                dots[i].setBackgroundResource(R.mipmap.dot);
            }
            group.addView(imageView);
        }
        //将图片填充到数组中
        imageViews = new ImageView[img.length];
        for(int i=0; i<imageViews.length; i++){
            ImageView imageView = new ImageView(this);
            imageViews[i] = imageView;
            imageView.setBackgroundResource(img[i]);
        }
        //设置Adapter
        vPager.setAdapter(new MyPagerAdapter(imageViews));
        //设置监听，主要是设置点点的背景
        vPager.setOnPageChangeListener(this);
        //设置ViewPager的默认项, 设置为长度的100倍，这样子开始就能往左滑动
        vPager.setCurrentItem((imageViews.length) * 100);
        handler = new Handler();
        handler.postDelayed(new TimerRunnable(),1000);
    }
    class TimerRunnable implements Runnable{
        @Override
        public void run() {
            int curItem = vPager.getCurrentItem();
            vPager.setCurrentItem(curItem+1);
            if (handler!=null){
                handler.postDelayed(this,1000);
            }
        }
    }

还会用到：

private void setImageBackground(int index) {
    for(int i=0; i<dots.length; i++){
        if(i == index){
            dots[i].setBackgroundResource(R.mipmap.dot_focus);
        }else{
            dots[i].setBackgroundResource(R.mipmap.dot);
        }
    }
}

在oncreate中调用initView（）；就行了。

public class MyPagerAdapter extends PagerAdapter {
    private ImageView[] imageViews;// 轮播图的数组
    public MyPagerAdapter(ImageView[] imageViews){
        this.imageViews = imageViews;
    }
    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }
    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0 == arg1;
    }
    @Override
    public void destroyItem(View container, int position, Object object) {
//        ((ViewPager)container).removeView(imageViews[position % imageViews.length]);
    }
    /**
     * 载入图片进去，用当前的position 除以 图片数组长度取余数是关键
     */
    @Override
    public Object instantiateItem(View container, int position) {
        try {
            ((ViewPager)container).addView(imageViews[position % imageViews.length], 0);
        }catch(Exception e){
            //handler something
        }
        return imageViews[position % imageViews.length];
    }
}

这里是viewpage的adapter。

private ViewPager vPager;
private ImageView[] dots; // 小圆点的数组
private ImageView[] imageViews;// 轮播图的数组
private int[] img = new int[] { R.mipmap.pic_one, R.mipmap.pic_two,
        R.mipmap.pic_three, R.mipmap.pic_one };// 图片 资源

上面的是有关变量。

这就是第二种方法。

viewpage 添加fragment 报错 viewpage demo LayoutInflater 自定义控件轮播图demo