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利用DrawerLayout和触摸事件分发实现抽屉侧滑效果

2019年07月24日  | 移动技术网IT编程  | 我要评论

图王阁,贾玲瘦的照片,苏梓玲高清大图

本文实例为大家分享了drawerlayout和触摸事件分发实现抽屉侧滑效果的具体代码，供大家参考，具体内容如下

效果展示

还是看代码实在，直接上菜了。

1.mainactivity的代码：

public class mainactivity extends appcompatactivity implements  mydrawelayout.getpositioncallback {

    private list<imageview> imagelist;
    private viewpager viewpager;
    private myadapter adapter;
    private mydrawelayout mydrawelayout;
    private int currentposition;

    @override
    protected void oncreate (bundle savedinstancestate){
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    viewpager = (viewpager) findviewbyid(r.id.viewpager);
    mydrawelayout = (mydrawelayout) findviewbyid(r.id.mydrawelayout);
    initdata();
    adapter = new myadapter(this, imagelist);
     mydrawelayout.setcallback(this);
    viewpager.setadapter(adapter);
      viewpager.addonpagechangelistener(new viewpager.onpagechangelistener() {
        @override
        public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {

        }

        @override
        public void onpageselected(int position) {
          currentposition=position;
        }

        @override
        public void onpagescrollstatechanged(int state) {

        }
      });

  }
  private void initdata() {
    imagelist = new arraylist<imageview>();

    imageview imageview = new imageview(this);
    imageview.setimageresource(r.mipmap.ic_launcher);
    imageview.setscaletype(imageview.scaletype.fit_xy);
    imagelist.add(imageview);

    imageview = new imageview(this);
    imageview.setimageresource(r.mipmap.ic_launcher);
    imageview.setscaletype(imageview.scaletype.fit_xy);
    imagelist.add(imageview);

    imageview = new imageview(this);
    imageview.setimageresource(r.mipmap.ic_launcher);
    imageview.setscaletype(imageview.scaletype.fit_xy);
    imagelist.add(imageview);

    imageview = new imageview(this);
    imageview.setimageresource(r.mipmap.ic_launcher);
    imageview.setscaletype(imageview.scaletype.fit_xy);
    imagelist.add(imageview);


  }


  @override
  public int position() {
    return currentposition;//todo 通过接口回调把当前位置传到mydrawelayout中
  }
}

2.mydrawelayout类中的代码：

public class mydrawelayout extends drawerlayout {
  public mydrawelayout(context context) {
    super(context);
  }

  public mydrawelayout(context context, attributeset attrs) {
    super(context, attrs);
  }

  public mydrawelayout(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
  }
  //todo　事件拦截
  @override
  public boolean onintercepttouchevent(motionevent ev) {
    //todo 获得当前位置，进行判断
    if(callback.position()==0){
      return super.onintercepttouchevent(ev);
    }else {
      return false;
    }
  }



  public interface getpositioncallback{
    int position();
  }
 private getpositioncallback callback;
  public void setcallback(getpositioncallback callback){
    this.callback = callback;

  }
}

3.适配器的代码;

public class myadapter extends pageradapter {

  private final list<imageview> imagelist;
  private final context contex;

  public myadapter(context context, list<imageview> imagelist) {
  this.contex=context;
    this.imagelist = imagelist;
  }

  @override
  public int getcount() {
    return imagelist.size();
  }

  @override
  public boolean isviewfromobject(view view, object object) {
    return view==object;
  }

  @override
  public object instantiateitem(viewgroup container, int position) {
    imageview imageview = imagelist.get(position);
    container.addview(imageview);
    return imageview;
  }

  @override
  public void destroyitem(viewgroup container, int position, object object) {
    //super.destroyitem(container, position, object);这行代码记得删除，不然滑到viewpager的时候会闪退哦
    container.removeview(imagelist.get(position));
  }
}

4.xml布局：

<?xml version="1.0" encoding="utf-8"?>
<com.example.a43_drawelayoutandviewpager.mydrawelayout
  android:id="@+id/mydrawelayout"
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
>
<relativelayout
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <android.support.v4.view.viewpager
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:id="@+id/viewpager"/>
  </relativelayout>
  <imageview

    android:background="@mipmap/ic_launcher"
    android:layout_width="300dp"
    android:layout_gravity = "start"
    android:layout_height="match_parent"
    android:layout_below="@+id/viewpager"
   />
</com.example.a43_drawelayoutandviewpager.mydrawelayout>

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