Android 多图上传后将图片进行九宫格展示的实例代码

public abstract class ninegridadapter {
  protected context context;
  protected list list;

  public ninegridadapter(context context, list list) {
    this.context = context;
    this.list = list;
  }

  public abstract int getcount();

  public abstract string geturl(int positopn);

  public abstract object getitem(int position);

  public abstract long getitemid(int position);

  public abstract view getview(int i, view view);

}

package com.wd.weidologin.pic;

import android.content.context;
import android.util.attributeset;
import android.util.displaymetrics;
import android.view.view;
import android.view.viewgroup;
import android.widget.imageview;

public class ninegridlayout extends viewgroup {
  private ninegridadapter adapter;
  private onitemclicklisterner onitemclicklisterner;

  // 行间距
  private int linespace;
  //列间距
  private int gap;

  private final int default_width = 140;

  private int columns;//
  private int rows;//
  private int totalwidth;
  private context context;
  int singlewidth = 0, singleheight = 0;
  private int defaultwidth, defaultheight;

  private int oldcount;

  public ninegridlayout(context context) {
    this(context, null);
  }

  public ninegridlayout(context context, attributeset attrs) {
    this(context, attrs, 0);
  }

  public ninegridlayout(context context, attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
    this.context = context;
    gap = dip2px(context, 10);
    linespace = dip2px(context,10);
    viewgroup.layoutparams lp = new viewgroup.layoutparams(viewgroup.layoutparams.wrap_content,
        viewgroup.layoutparams.wrap_content);

    defaultwidth = defaultheight = dip2px(context, default_width);
  }

  public void setdefaultwidth(int defaultwidth) {
    this.defaultwidth = defaultwidth;
  }

  public void setdefaultheight(int defaultheight) {
    this.defaultheight = defaultheight;
  }

  public void setadapter(ninegridadapter adapter) {
    this.adapter = adapter;
    if (adapter == null) {
      return;
    }
    //初始化布局形状
    generatechildrenlayout(adapter.getcount());
    //这里做一个重用view的处理
//    if (oldcount == 0) {
    removeallviews();
    for (int i = 0; i < adapter.getcount(); i++) {
      view itemview = adapter.getview(i, null);
      addview(itemview, generatedefaultlayoutparams());
    }
//    }
     /*else {
      //以前添加过view
      int newviewcount = adapter.getcount();
      if (oldcount > newviewcount) {
        removeviews(newviewcount - 1, oldcount - newviewcount);
        for (int i = 0; i < newviewcount - 1; i++) {
          adapter.getview(i, getchildat(i));
        }
      } else if (oldcount < newviewcount) {
        for (int i = 0; i < newviewcount - oldcount; i++) {
          view itemview = adapter.getview(i, null);
          addview(itemview, generatedefaultlayoutparams());
        }
      }
    }*/

    oldcount = adapter.getcount();
    requestlayout();
  }

  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    int widthmode = measurespec.getmode(widthmeasurespec);
    int heightmode = measurespec.getmode(heightmeasurespec);
    int sizewidth = measurespec.getsize(widthmeasurespec);
    int sizeheight = measurespec.getsize(heightmeasurespec);
    totalwidth = sizewidth - getpaddingleft() - getpaddingright();
    if (adapter != null && adapter.getcount() > 0) {
      int measurewidth, measureheight;
      int childrencount = adapter.getcount();
      if (childrencount == 1) {
        singlewidth = defaultwidth;
        singleheight = defaultheight;
      } else {
        singlewidth = (totalwidth - gap * (3 - 1)) / 3;
        singleheight = singlewidth;
      }
      measurechildren(measurespec.makemeasurespec(singlewidth, measurespec.exactly),
          measurespec.makemeasurespec(singleheight, measurespec.exactly));
      measurewidth = singlewidth * columns + gap * (columns - 1);
      measureheight = singleheight * rows + linespace * (rows - 1);
      setmeasureddimension(sizewidth, measureheight);
    }
  }

  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {

    layoutchildrenview();
  }

  private void layoutchildrenview() {
    if (adapter == null || adapter.getcount() == 0) {
      return;
    }
    int childrencount = adapter.getcount();
    for (int i = 0; i < childrencount; i++) {
      int[] position = findposition(i);
      int left = (singlewidth + gap) * position[1] + getpaddingleft();
      int top = (singleheight + linespace) * position[0] + getpaddingtop();
      int right = left + singlewidth;
      int bottom = top + singleheight;
      imageview childrenview = (imageview) getchildat(i);
      if (childrencount == 1) {
        //只有一张图片
        childrenview.setscaletype(imageview.scaletype.fit_center);
      } else {
        childrenview.setscaletype(imageview.scaletype.center_crop);
      }

      final int itemposition = i;
      childrenview.setonclicklistener(new onclicklistener() {
        @override
        public void onclick(view v) {
          if (onitemclicklisterner != null) {
            onitemclicklisterner.onitemclick(v, itemposition);
          }
        }
      });
      childrenview.layout(left, top, right, bottom);
    }
  }


  private int[] findposition(int childnum) {
    int[] position = new int[2];
    for (int i = 0; i < rows; i++) {
      for (int j = 0; j < columns; j++) {
        if ((i * columns + j) == childnum) {
          position[0] = i;//行
          position[1] = j;//列
          break;
        }
      }
    }
    return position;
  }

  public int getgap() {
    return gap;
  }

  public void setgap(int gap) {
    this.gap = gap;
  }

  /**
   * 根据图片个数确定行列数量
   * 对应关系如下
   * num	row	column
   * 1	  1	1
   * 2	  1	2
   * 3	  1	3
   * 4	  2	2
   * 5	  2	3
   * 6	  2	3
   * 7	  3	3
   * 8	  3	3
   * 9	  3	3
   *
   * @param length
   */
  private void generatechildrenlayout(int length) {
    if (length <= 3) {
      rows = 1;
      columns = length;
    } else if (length <= 6) {
      rows = 2;
      columns = 3;
      if (length == 4) {
        columns = 2;
      }
    } else {
      rows = 3;
      columns = 3;
    }
  }

  /**
   * dp to px
   */
  public static int dip2px(context context, double dpvalue) {
    final float scale = context.getresources().getdisplaymetrics().density;
    return (int) (dpvalue * scale + 0.5f);
  }

  public void setonitemclicklisterner(onitemclicklisterner onitemclicklisterner) {
    this.onitemclicklisterner = onitemclicklisterner;
  }

  public interface onitemclicklisterner {
    public void onitemclick(view view, int position);
  }

}

package com.wd.weidologin.home;

import androidx.appcompat.app.appcompatactivity;
import androidx.recyclerview.widget.gridlayoutmanager;
import androidx.recyclerview.widget.recyclerview;

import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import android.content.sharedpreferences;
import android.graphics.color;
import android.os.bundle;
import android.util.log;
import android.view.view;
import android.view.viewgroup;
import android.widget.imageview;
import android.widget.toast;

import com.bumptech.glide.glide;
import com.google.gson.gson;
import com.wd.weidologin.r;
import com.wd.weidologin.adapter.attentionrequestadapter;
import com.wd.weidologin.okutil.okre;
import com.wd.weidologin.pic.ninegridadapter;
import com.wd.weidologin.pic.ninegridlayout;

import java.util.arraylist;
import java.util.hashmap;
import java.util.list;

public class mainactivity2 extends appcompatactivity {
  private recyclerview ry;
  private attentionrequestadapter attentionrequestadapter;
  private arraylist<circlebean.resultentity> lists=new arraylist<>();
  private ninegridlayout mgv;
  private circlebean.resultentity result;
  private string picture;
  private list<string> list = new arraylist<string>();
  private adapter adapter;
  public static final string action ="com.example.casts";
  private string msg;
  private sharedpreferences canfig;
  private sharedpreferences.editor edited;
  private string imageurl = "http://www.51sjk.com/Upload/Articles/1/0/247/247787_20210623001200317.jpg";//如果没有接口可以用这个简单代替这个就不需要进行切割了

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main2);
    init();//（有接口的情况）
    
     list.add(imageurl);//没有接口的情况 ---====================
     if (adapter == null){
      adapter = new adapter(this,list);
      mgv.setadapter(adapter);
    }

    mgv.setonitemclicklisterner(new ninegridlayout.onitemclicklisterner() {
      @override
      public void onitemclick(view view, int position) {
        toast.maketext(getapplicationcontext(), string.valueof(position),toast.length_long).show();
      }
    });//没有接口的情况 ---====================不要混


  }
  private void init() {
    // int sickcircleid = getintent().getintextra("sickcircleid", 0);
    canfig = getsharedpreferences("canfig", context.mode_private);
    edited = canfig.edit();
    int resultkey = canfig.getint("resultkey", 0);

    string url="http:....."+resultkey;
    hashmap<string, string> headmap = new hashmap<>();
    headmap.put("userid","287");
    headmap.put("sessionid","1604985492394287");
    okre.getinstance().getcircledetails(url,headmap, new okre.netcallback() {

      @override
      public void onsuccess(string string) {
        circlebean circlebean = new gson().fromjson(string, circlebean.class);
        picture = circlebean.getresult().getpicture();
        toast.maketext(mainactivity2.this, picture+"", toast.length_short).show();
        mgv = findviewbyid(r.id.d);
        string[] split = picture.split(",");//一般多图上传后需要将图片进行切割
        if (picture.equals("")){//在这里我进行了是否有图片的判断以免没有图片还进行占位
          mgv.setvisibility(view.gone);
        }
        for (int i = 0; i < split.length; i++) {
          list.add(split[i]);
        }
        if (adapter == null){
          adapter = new adapter(mainactivity2.this,list);
          mgv.setadapter(adapter);
        }

        mgv.setonitemclicklisterner(new ninegridlayout.onitemclicklisterner() {图片点击事件
          @override
          public void onitemclick(view view, int position) {
            toast.maketext(getapplicationcontext(), string.valueof(position),toast.length_long).show();
          }
        });
      }

      @override
      public void onfail(string string) {
        // toast.maketext(mainactivity.this, string+"", toast.length_short).show();
      }
    });

  }


  private class adapter extends ninegridadapter {//适配器

    public adapter(context context, list list){
      super(context,list);
    }

    @override
    public int getcount() {
      return list == null?0:list.size();
    }

    @override
    public string geturl(int positon) {
      return getitem(positon) == null ? null : getitem(positon).tostring();
    }

    @override
    public object getitem(int position) {
      return (list == null) ? null : list.get(position);
    }

    @override
    public long getitemid(int position) {
      return position;
    }

    @override
    public view getview(int i, view view) {

      imageview imageview = new imageview(getapplicationcontext());
      viewgroup.layoutparams lp = new viewgroup.layoutparams(viewgroup.layoutparams.wrap_content,
          viewgroup.layoutparams.wrap_content);

      imageview.setscaletype(imageview.scaletype.center_crop);
      imageview.setbackgroundcolor(color.parsecolor("#f5f5f5"));
      imageview.setlayoutparams(lp);
      glide.with(context).load(geturl(i)).into(imageview);
      return imageview;
    }
  }
}

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
  <base-config cleartexttrafficpermitted="true" />
</network-security-config>

<uses-permission android:name="android.permission.internet" />