android viewPager 实现图片无限循环滑动并带有进度的自定义布局

最新推荐文章于 2022-05-30 20:36:52 发布

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#android #viewpager #布局

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本文介绍了一种使用Android的ViewPager实现图片无限循环轮播的方法，并且在顶部加入了图片轮播进度指示器。通过自定义MyViewPager类，可以轻松地设置图片资源并启动轮播效果。

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ViewPager是安卓一款强大的控件，它实现了图片，fragment等的滑动轮播，在这里我们实现了利用ViewPager实现图片无限循环并且上部带有图片轮播进度的效果，代码如下：

首先MainActivity.java

public class MainActivity extends Activity {
    MyViewPager vpp;
    private int[]images = new int[]{R.mipmap.img1, R.mipmap.img2, R.mipmap.img3};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        vpp=(MyViewPager)findViewById(R.id.vpp);
        vpp.startScroll(images);
    }
}

MainActivity 的布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              tools:context=".MainActivity">
  <com.gcp.myviewpager.MyViewPager
      android:id="@+id/vpp"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      ></com.gcp.myviewpager.MyViewPager>
</LinearLayout>

自定义MyViewPager —-MyViewPager.java

public class MyViewPager extends LinearLayout{
    private ViewPager topVp;
    private RadioGroup rb_g;
    private List<ImageView> imageViews ;
    Context context;

    public MyViewPager(Context context, AttributeSet attrs) {
        super(context,attrs);
        this.context=context;
        View rootView= LayoutInflater.from(context).inflate(R.layout.my_view_pager,this);
        topVp = (ViewPager)rootView. findViewById(R.id.vp_main);
        rb_g=(RadioGroup)rootView. findViewById(R.id.rb_g);
    }


    public void startScroll(int[]images){
        this.imageViews = new ArrayList<>();
        for(int i = 0;i<images.length;i++){
            ImageView imageView = new ImageView(context);
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setImageResource(images[i]);
            imageViews.add(imageView);
        }
        topVp.setAdapter(new PagerAdapter() {
            @Override
            public int getCount() {
                return 10000;
            }

            @Override
            public boolean isViewFromObject(View view, Object object) {
                return view==object;
            }

            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
            }

            @Override
            public Object instantiateItem(ViewGroup container, int position) {
                try {
                    container.addView(imageViews.get(position%imageViews.size()));
                }catch (Exception e){

                }
                return imageViews.get(position%imageViews.size());
            }
        });
        topVp.setCurrentItem((10000/2/imageViews.size())*imageViews.size());
        initLine();
        changeLine((10000/2/imageViews.size())*imageViews.size()%3);
        topVp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }

            @Override
            public void onPageSelected(int position) {
                changeLine(position%imageViews.size());
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }
    public void initLine(){
        RadioGroup.LayoutParams params=new RadioGroup.LayoutParams(0, RadioGroup.LayoutParams.MATCH_PARENT);
        params.weight=1;
        for(int i=0;i<imageViews.size();i++){
            RadioButton radioButton=new RadioButton(context);
            radioButton.setLayoutParams(params);
            radioButton.setButtonDrawable(null);
            radioButton.setBackgroundResource(R.drawable.rb_back);
            radioButton.setEnabled(false);
            rb_g.addView(radioButton,i);
        }
    }
    public void changeLine(int position){
        ((RadioButton)(rb_g.getChildAt(position))).setChecked(true);
    }
}

my_view_pager.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <RadioGroup
        android:id="@+id/rb_g"
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:orientation="horizontal"></RadioGroup>
    <android.support.v4.view.ViewPager
        android:id="@+id/vp_main"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:flipInterval="0"
        ></android.support.v4.view.ViewPager>
</LinearLayout>

rb_back.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:drawable="@drawable/select_back">
    </item>
    <item android:state_checked="false" android:drawable="@drawable/select_no_back">
    </item>
</selector>

select_back.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#FFfbc400"/>
</shape>

select_no_back.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#FFF7F7F7"/>
</shape>

代码下载