Android自定义Banner轮播效果

史淇

2023-03-14

本文向大家介绍Android自定义Banner轮播效果，包括了Android自定义Banner轮播效果的使用技巧和注意事项，需要的朋友参考一下

本文实例为大家分享了Android自定义Banner轮播效果展示的具体代码，供大家参考，具体内容如下

自定义View布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content">

  <android.support.v4.view.ViewPager
    android:id="@+id/banner_view_pager"
    android:layout_width="match_parent"
    android:layout_height="200dp">

  </android.support.v4.view.ViewPager>

  <LinearLayout
    android:id="@+id/linear_bannner"
    android:layout_centerHorizontal="true"
    android:layout_alignBottom="@+id/banner_view_pager"
    android:layout_marginBottom="10dp"
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

  </LinearLayout>


</RelativeLayout>

自定义View主体内容

public class CustomBanner extends FrameLayout {

  @BindView(R.id.banner_view_pager)
  ViewPager bannerViewPager;
  @BindView(R.id.linear_bannner)
  LinearLayout linearBannner;
  private List<String> list;
  private int time = 2;

  private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      if (msg.what == 0) {

        int currentItem = bannerViewPager.getCurrentItem();

        bannerViewPager.setCurrentItem(currentItem + 1);

        //再次发送
        sendEmptyMessageDelayed(0, time * 1000);

      }
    }
  };
  private List<ImageView> listDoc;
  private OnClickLisner onClickLisner;

  public CustomBanner(@NonNull Context context) {
    super(context);
    init();
  }

  public CustomBanner(@NonNull Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    init();
  }

  public CustomBanner(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }

  /**
   * 初始化
   */
  private void init() {

    View view = View.inflate(getContext(), R.layout.bannner_layout, this);
    ButterKnife.bind(this, view);

  }

  /**
   * 对外提供设置image路径的方法
   */
  public void setImageUrls(List<String> list) {
    this.list = list;

    if (list == null) {
      return;
    }

    //设置适配器
    LunBoAdapter lunBoAdapter = new LunBoAdapter(getContext(), list);
    bannerViewPager.setAdapter(lunBoAdapter);

    initDoc();

    //显示中间某个位置
    bannerViewPager.setCurrentItem(list.size() * 10000);

    //使用handler自动轮播
    handler.sendEmptyMessageDelayed(0, time * 1000);

    //状态改变的监听事件
    bannerViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

      }

      @Override
      public void onPageSelected(int position) {
        //在选中某一页的时候,切换小圆点的背景
        for (int i = 0; i < listDoc.size(); i++) {
          if (position % listDoc.size() == i) {
            listDoc.get(i).setBackgroundResource(R.drawable.shape_01);
          } else {
            listDoc.get(i).setBackgroundResource(R.drawable.shape_02);
          }
        }


      }

      @Override
      public void onPageScrollStateChanged(int state) {

      }
    });


  }

  /**
   * 初始化小圆点
   */
  private void initDoc() {

    //创建一个集合,记录这些小圆点
    listDoc = new ArrayList<>();
    //清空布局
    linearBannner.removeAllViews();

    for (int i = 0; i < list.size(); i++) {

      ImageView docImage = new ImageView(getContext());
      if (i == 0) {
        docImage.setBackgroundResource(R.drawable.shape_01);
      } else {
        docImage.setBackgroundResource(R.drawable.shape_02);
      }

      //添加到集合
      listDoc.add(docImage);

      //添加到线性布局
      LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

      params.setMargins(5, 0, 5, 0);

      linearBannner.addView(docImage, params);


    }


  }

  /**
   * 对外提供轮播的时间
   */
  public void setTimeSecond(int time) {
    this.time = time;
  }

  /**
   * 点击事件
   *
   * @param onClickLisner
   */
  public void setClickListner(OnClickLisner onClickLisner) {

    this.onClickLisner = onClickLisner;
  }

  private class LunBoAdapter extends PagerAdapter {

    private List<String> list;
    private Context context;

    public LunBoAdapter(Context context, List<String> list) {
      this.context = context;
      this.list = list;
    }

    @Override
    public int getCount() {
      return Integer.MAX_VALUE;
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, final int position) {

      //创建imageView
      ImageView imageView = new ImageView(context);
      imageView.setScaleType(ImageView.ScaleType.FIT_XY);
      //加载这张图片
      Glide.with(context).load(list.get(position % list.size())).into(imageView);


      //点击事件
      imageView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
          //触发
          onClickLisner.onItemClick(position % list.size());
        }
      });

      //触摸事件
      imageView.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {

          switch (motionEvent.getAction()) {
            case MotionEvent.ACTION_DOWN:
              //取消handler身上的消息和回调
              handler.removeCallbacksAndMessages(null);

              break;
            case MotionEvent.ACTION_MOVE:
              handler.removeCallbacksAndMessages(null);
              break;
            case MotionEvent.ACTION_CANCEL:
              handler.sendEmptyMessageDelayed(0, time * 1000);
              break;
            case MotionEvent.ACTION_UP:
              handler.sendEmptyMessageDelayed(0, time * 1000);
              break;
          }

          return false;
        }
      });

      //添加到容器
      container.addView(imageView);

      //返回

      return imageView;
    }

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

      container.removeView((View) object);
    }
  }

  public interface OnClickLisner {
    void onItemClick(int position);
  }
}

自定义小圆点

public class CountView extends View implements View.OnClickListener {

  private int count = 0;

  public CountView(Context context) {
    super(context);
    init();
  }


  public CountView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    init();
  }

  public CountView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }

  //初始化的方法
  private void init() {

    this.setOnClickListener(this);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    Paint paint = new Paint();
    paint.setColor(Color.RED);
    paint.setAntiAlias(true);
    paint.setStyle(Paint.Style.FILL);

    //圆
    canvas.drawCircle(300,300,200,paint);


    paint.setColor(Color.BLACK);
    paint.setTextSize(100);

    String text = String.valueOf(count);

    //拿到文本的宽度和高度
    Rect rect = new Rect();
    paint.getTextBounds(text,0,text.length(),rect);

    canvas.drawText(text,300-rect.width()/2,300+rect.height()/2,paint);

  }

  @Override
  public void onClick(View view) {
    count ++;

    //重新绘制
    postInvalidate();
  }
}

小圆点shape

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

  <solid android:color="#00ff00"/>

  <corners android:radius="10dp"/>

  <size android:height="10dp" android:width="10dp"/>


</shape>

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

  <solid android:color="#ff0000"/>

  <corners android:radius="10dp"/>

  <size android:height="10dp" android:width="10dp"/>


</shape>

在Main中运行

public class MainActivity extends AppCompatActivity {

  private CustomBanner customBanner;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    customBanner = findViewById(R.id.custom_banner);

    getDataFromNet();
  }

  private void getDataFromNet() {

    OkHttpUtil.doGet("https://www.zhaoapi.cn/ad/getAd", new Callback() {

      private List<String> list;

      @Override
      public void onFailure(Call call, IOException e) {

      }

      @Override
      public void onResponse(Call call, Response response) throws IOException {
        if (response.isSuccessful()){
          String json = response.body().string();

          final HomeBean detalBean = new Gson().fromJson(json,HomeBean.class);

          list = new ArrayList<>();
          List<HomeBean.DataBean> data = detalBean.getData();

          for (int i = 0; i < data.size(); i++) {
            String icon = data.get(i).getIcon();
            list.add(icon);
          }

          runOnUiThread(new Runnable() {
            @Override
            public void run() {
              //设置时间
              customBanner.setTimeSecond(5);

              //设置显示轮播
              customBanner.setImageUrls(list);

              //banner的点击跳转详情页面的事件
    banner.setOnBannerListener(new OnBannerListener() {
      @Override
      public void OnBannerClick(int position) {

        List<ShouBean.DataBean> datab = shouBean.getData();

        if (datab.get(position).getType() == 0) {
          Intent intent = new Intent(getActivity(), WebViewActivity.class);
          intent.putExtra("databurl", datab.get(position).getUrl());
          startActivity(intent);
        } else {
          Toast.makeText(getContext(), "即将跳转到商品详情页面", Toast.LENGTH_SHORT).show();
        }
      }
    });

            }
          });

        }
      }
    });

  }
}

WebView页面

public class WebViewActivity extends AppCompatActivity {

  private WebView web_view;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_web_view);

    web_view = findViewById(R.id.web_view);

    String databurl = getIntent().getStringExtra("databurl");

    web_view.loadUrl(databurl);

    //webview一系列设置
    web_view.setWebViewClient(new WebViewClient());//在当前应用打开,而不是去浏览器
    WebSettings settings = web_view.getSettings();
    settings.setJavaScriptEnabled(true);
    settings.setJavaScriptCanOpenWindowsAutomatically(true);
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持小牛知识库。

Android自定义Banner轮播效果

相关阅读

相关文章

相关问答

相关工具

相关文档