android制作微信添加多个图片放大图片功能-kb88凯时官网登录

1.添加依赖

implementation 'com.github.bumptech.glide:glide:4.12.0' //裁剪图片等等
implementation 'androidx.recyclerview:recyclerview:1.1.0' //recycleview依赖

2.使用recycleview

3.编写两个item页面为recycleview的子页面

//点击添加按钮

4.写recycleview的适配器

package com.example.myapplication;
import android.content.context;
import android.content.intent;
import android.net.uri;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.button;
import android.widget.imageview;
import androidx.annotation.nonnull;
import androidx.recyclerview.widget.recyclerview;
import com.bumptech.glide.glide;
import java.util.arraylist;
public class imageadapter extends recyclerview.adapter {
    private final int view_type_image = 0;
    private final int view_type_add_button = 1;
    private arraylist imageuris;
    private context context;
    private layoutinflater inflater;
    private onaddbuttonclicklistener addbuttonclicklistener;
    public interface onaddbuttonclicklistener {
        void onaddbuttonclick();
    }
    public imageadapter(context context, onaddbuttonclicklistener listener) {
        this.context = context;
        this.imageuris = new arraylist<>();
        this.inflater = layoutinflater.from(context);
        this.addbuttonclicklistener = listener;
    }
    public recyclerview.viewholder oncreateviewholder(@nonnull viewgroup parent, int viewtype) {
        if (viewtype == view_type_image) {
            view itemview = inflater.inflate(r.layout.iteam, parent, false);
            return new imageviewholder(itemview);
        } else {
            view itemview = inflater.inflate(r.layout.iteambutton, parent, false);
            button addbutton = itemview.findviewbyid(r.id.btnadd);
            addbutton.setonclicklistener(v -> addbuttonclicklistener.onaddbuttonclick());
            return new addbuttonviewholder(itemview);
        }
    }
    @override
    public void onbindviewholder(@nonnull recyclerview.viewholder holder, int position) {
        if (getitemviewtype(position) == view_type_image) {
            uri uri = imageuris.get(position);
            imageviewholder imageholder = (imageviewholder) holder;
            glide.with(context)
                    .load(uri)
                    .centercrop()
                    .into( imageholder.imageview);
           //点击图片 放大图片，跳转页面
            imageholder.imageview.setonclicklistener(new view.onclicklistener() {
                @override
                public void onclick(view v) {
                    intent intent=new intent(context,emptyactivity.class);
                    intent.putextra("url",uri.tostring());
                    context.startactivity(intent);
                }
            });
        }
    }
    @override
    public int getitemcount() {
        // plus one for the add button
        return imageuris.size()   1
    }
    @override
    public int getitemviewtype(int position) {
        return position == imageuris.size() ? view_type_add_button : view_type_image;
    }
    public void addimage(uri uri) {
        imageuris.add(uri);
        notifyiteminserted(imageuris.size() - 1);
    }
    static class imageviewholder extends recyclerview.viewholder {
        imageview imageview;
        imageviewholder(view itemview) {
            super(itemview);
            imageview = itemview.findviewbyid(r.id.imgview);
        }
    }
    static class addbuttonviewholder extends recyclerview.viewholder {
        addbuttonviewholder(view itemview) {
            super(itemview);
        }
    }
}
 

5.编写java文件

package com.example.myapplication;
import android.content.intent;
import android.net.uri;
import android.os.bundle;
import android.provider.mediastore;
import androidx.annotation.nullable;
import androidx.appcompat.app.appcompatactivity;
import androidx.recyclerview.widget.gridlayoutmanager;
import androidx.recyclerview.widget.linearlayoutmanager;
import androidx.recyclerview.widget.recyclerview;
import java.util.arraylist;
public class recycleactivity extends appcompatactivity  implements imageadapter.onaddbuttonclicklistener{
    private static final int request_code_pick_image = 1;
    private imageadapter imageadapter;
    private recyclerview recyclerview;
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_recy_cle);
        recyclerview = findviewbyid(r.id.recyclerview);
        recyclerview.setlayoutmanager(new gridlayoutmanager(this,3));
        imageadapter = new imageadapter(this, this);
        recyclerview.setadapter(imageadapter);
    }
    @override
    public void onaddbuttonclick() {
        intent intent = new intent(intent.action_pick, mediastore.images.media.external_content_uri);
        startactivityforresult(intent, request_code_pick_image);
    }
    protected void onactivityresult(int requestcode, int resultcode, @nullable intent data) {
        super.onactivityresult(requestcode, resultcode, data);
        if (requestcode == request_code_pick_image && resultcode == result_ok) {
            if (data != null) {
                uri selectedimageuri = data.getdata();
                if (selectedimageuri != null) {
                    imageadapter.addimage(selectedimageuri);
                }
            }
        }
    }
}

6.编写点击图片后放大图片，创建emptyactivity页面

package com.example.myapplication;
import androidx.appcompat.app.appcompatactivity;
import android.net.uri;
import android.os.bundle;
import android.widget.imageview;
import com.bumptech.glide.glide;
import javax.microedition.khronos.opengles.gl;
public class emptyactivity extends appcompatactivity {
    private imageview img;
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_empty);
        img=findviewbyid(r.id.img);
        string imageuristring = getintent().getstringextra("url");
        glide.with(emptyactivity.this)
                .load(imageuristring)
                .into(img);
    }
}