Android GridView扩展仿微信微博发图动态添加删除图片功能

在平时的开发中，我们会看到不管是微信发朋友圈照片还是微博发布新鲜事，添加图片的时候都是选完后面还有个+号再去选择图片，这样的话比较方便用户去添加图片，有的右上角还有个－号方便用户去删除图片，而一般用户选择的图片多少都是不定的，我们只限制最大张数，我们用gridview去实现，代码可能比较简单，高手请略过。

0.效果图

1.准备资源图片

添加图片的+号图片

删除图片的图片

2.可设置限制用户选择最大张数

/**
  * 可以动态设置最多上传几张，之后就不显示+号了，用户也无法上传了
  * 默认9张
  */
 private int maxImages = 9;
 /**
  * 获取最大上传张数
  *
  * @return
  */
 public int getMaxImages() {
  return maxImages;
 }

 /**
  * 设置最大上传张数
  *
  * @param maxImages
  */
 public void setMaxImages(int maxImages) {
  this.maxImages = maxImages;
 }

3.设置GridView的总数

/**
  * 让GridView中的数据数目加1最后一个显示+号
  * 当到达最大张数时不再显示+号
  * @return 返回GridView中的数量
  */
 @Override
 public int getCount() {
  int count = datas == null ? 1 : datas.size() + 1;
  if (count >= maxImages) {
   return datas.size();
  } else {
   return count;
  }
 }

4.getView()中根据position判断+号的显示

 @Override
 public View getView(final int position, View convertView, ViewGroup parent) {


  ViewHolder viewHolder = null;
  if (convertView == null) {
   convertView = inflater.inflate(R.layout.item_published_grida, parent, false);
   viewHolder = new ViewHolder(convertView);
   convertView.setTag(viewHolder);
  } else {
   viewHolder = (ViewHolder) convertView.getTag();
  }
  /**代表+号之前的需要正常显示图片**/
  if (datas != null && position < datas.size()) {
   final File file = new File(datas.get(position).get("path").toString());
   Glide.with(context)
     .load(file)
     .priority(Priority.HIGH)
     .into(viewHolder.ivimage);
   viewHolder.btdel.setVisibility(View.VISIBLE);
   viewHolder.btdel.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     if (file.exists()) {
      file.delete();
     }
     datas.remove(position);
     notifyDataSetChanged();
    }
   });
  } else {
   /**代表+号的需要+号图片显示图片**/
   Glide.with(context)
     .load(R.mipmap.image_add)
     .priority(Priority.HIGH)
     .centerCrop()
     .into(viewHolder.ivimage);
   viewHolder.ivimage.setScaleType(ImageView.ScaleType.FIT_XY);
   viewHolder.btdel.setVisibility(View.GONE);
  }

  return convertView;

 }

5.GridView的完整代码

package cn.bluemobi.dylan.gridviewaddimage;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.Priority;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * com.bm.falvzixun.adapter.GridViewAddImgAdpter
 *
 * @author yuandl on 2015/12/24.
 *   添加上传图片适配器
 */
public class GridViewAddImgesAdpter extends BaseAdapter {
 private List<Map<String, Object>> datas;
 private Context context;
 private LayoutInflater inflater;
 /**
  * 可以动态设置最多上传几张，之后就不显示+号了，用户也无法上传了
  * 默认9张
  */
 private int maxImages = 9;

 public GridViewAddImgesAdpter(List<Map<String, Object>> datas, Context context) {
  this.datas = datas;
  this.context = context;
  inflater = LayoutInflater.from(context);
 }

 /**
  * 获取最大上传张数
  *
  * @return
  */
 public int getMaxImages() {
  return maxImages;
 }

 /**
  * 设置最大上传张数
  *
  * @param maxImages
  */
 public void setMaxImages(int maxImages) {
  this.maxImages = maxImages;
 }

 /**
  * 让GridView中的数据数目加1最后一个显示+号
  * 当到达最大张数时不再显示+号
  * @return 返回GridView中的数量
  */
 @Override
 public int getCount() {
  int count = datas == null ? 1 : datas.size() + 1;
  if (count >= maxImages) {
   return datas.size();
  } else {
   return count;
  }
 }

 @Override
 public Object getItem(int position) {
  return null;
 }

 @Override
 public long getItemId(int position) {
  return 0;
 }

 public void notifyDataSetChanged(List<Map<String, Object>> datas) {
  this.datas = datas;
  this.notifyDataSetChanged();

 }

 @Override
 public View getView(final int position, View convertView, ViewGroup parent) {


  ViewHolder viewHolder = null;
  if (convertView == null) {
   convertView = inflater.inflate(R.layout.item_published_grida, parent, false);
   viewHolder = new ViewHolder(convertView);
   convertView.setTag(viewHolder);
  } else {
   viewHolder = (ViewHolder) convertView.getTag();
  }
  /**代表+号之前的需要正常显示图片**/
  if (datas != null && position < datas.size()) {
   final File file = new File(datas.get(position).get("path").toString());
   Glide.with(context)
     .load(file)
     .priority(Priority.HIGH)
     .into(viewHolder.ivimage);
   viewHolder.btdel.setVisibility(View.VISIBLE);
   viewHolder.btdel.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     if (file.exists()) {
      file.delete();
     }
     datas.remove(position);
     notifyDataSetChanged();
    }
   });
  } else {
   /**代表+号的需要+号图片显示图片**/
   Glide.with(context)
     .load(R.mipmap.image_add)
     .priority(Priority.HIGH)
     .centerCrop()
     .into(viewHolder.ivimage);
   viewHolder.ivimage.setScaleType(ImageView.ScaleType.FIT_XY);
   viewHolder.btdel.setVisibility(View.GONE);
  }

  return convertView;

 }

 public class ViewHolder {
  public final ImageView ivimage;
  public final Button btdel;
  public final View root;

  public ViewHolder(View root) {
   ivimage = (ImageView) root.findViewById(R.id.iv_image);
   btdel = (Button) root.findViewById(R.id.bt_del);
   this.root = root;
  }
 }
}

6.用法

主布局文件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:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#FFFFFF"
 android:orientation="vertical"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="cn.bluemobi.dylan.gridviewaddimage.MainActivity">

 <EditText
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="说点什么"
  android:textColor="#000000" />

 <GridView
  android:layout_marginTop="10dp"
  android:id="@+id/gw"
  android:numColumns="5"
  android:horizontalSpacing="6dp"
  android:columnWidth="60dp"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />

</LinearLayout>

gridview的item布局文件item_published_grida.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="66dp"
 android:layout_height="66dp">

 <RelativeLayout
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <ImageView
   android:id="@+id/iv_image"
   android:layout_width="match_parent"
   android:gravity="center"
   android:layout_height="match_parent"
   android:scaleType="centerCrop"/>

  <Button
   android:id="@+id/bt_del"
   android:layout_width="20dp"
   android:layout_height="20dp"
   android:layout_alignParentRight="true"
   android:background="@drawable/bt_dynamic_del" />
 </RelativeLayout>

</RelativeLayout>

弹出拍照和从相册选择的对话框布局文件dialog_add_picture.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_marginLeft="5.0dip"
 android:layout_marginRight="5.0dip"
 android:background="@android:color/transparent"
 android:orientation="vertical">

 <LinearLayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_margin="30px"
  android:orientation="vertical">

  <TextView
   android:id="@+id/tv_camera"
   android:layout_width="wrap_content"
   android:layout_height="144px"
   android:background="@mipmap/btn_top_arc"
   android:gravity="center"
   android:text="拍照"
   android:textColor="#666666"
   android:textSize="48px" />

  <ImageView
   android:layout_width="1022px"
   android:layout_height="4px"
   android:background="#666666" />

  <TextView
   android:id="@+id/tv_gallery"
   android:layout_width="wrap_content"
   android:layout_height="144px"
   android:gravity="center"
   android:background="@mipmap/btn_bottom_arc"
   android:text="从手机相册选择"
   android:textColor="#666666"
   android:textSize="48px" />
 </LinearLayout>

 <TextView
  android:id="@+id/tv_cancel"
  android:layout_width="wrap_content"
  android:layout_height="144px"
  android:layout_marginTop="20px"
  android:layout_marginLeft="30px"
  android:layout_marginRight="30px"
  android:layout_gravity="center_horizontal"
  android:background="@mipmap/btn_top_arc"
  android:gravity="center"
  android:text="取消"
  android:textColor="#666666"
  android:textSize="48px" />

</LinearLayout>

MainActivity

package cn.bluemobi.dylan.gridviewaddimage;

import android.app.Dialog;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Display;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.TextView;
import android.widget.Toast;

import net.bither.util.NativeUtil;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class MainActivity extends AppCompatActivity {
 private GridView gw;
 private List<Map<String, Object>> datas;
 private GridViewAddImgesAdpter gridViewAddImgesAdpter;
 private Dialog dialog;
 private final int PHOTO_REQUEST_CAREMA = 1;// 拍照
 private final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
 private File tempFile;
 private final String IMAGE_DIR = Environment.getExternalStorageDirectory() + "/gridview/";
 /* 头像名称 */
 private final String PHOTO_FILE_NAME = "temp_photo.jpg";

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  gw = (GridView) findViewById(R.id.gw);
  datas = new ArrayList<>();
  gridViewAddImgesAdpter = new GridViewAddImgesAdpter(datas, this);
  gw.setAdapter(gridViewAddImgesAdpter);
  gw.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
    showdialog();
   }
  });
 }

 /**
  * 选择图片对话框
  */
 public void showdialog() {
  View localView = LayoutInflater.from(this).inflate(
    R.layout.dialog_add_picture, null);
  TextView tv_camera = (TextView) localView.findViewById(R.id.tv_camera);
  TextView tv_gallery = (TextView) localView.findViewById(R.id.tv_gallery);
  TextView tv_cancel = (TextView) localView.findViewById(R.id.tv_cancel);
  dialog = new Dialog(this, R.style.custom_dialog);
  dialog.setContentView(localView);
  dialog.getWindow().setGravity(Gravity.BOTTOM);
  // 设置全屏
  WindowManager windowManager = getWindowManager();
  Display display = windowManager.getDefaultDisplay();
  WindowManager.LayoutParams lp = dialog.getWindow().getAttributes();
  lp.width = display.getWidth(); // 设置宽度
  dialog.getWindow().setAttributes(lp);
  dialog.show();
  tv_cancel.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View arg0) {
    dialog.dismiss();
   }
  });

  tv_camera.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View v) {
    dialog.dismiss();
    // 拍照
    camera();
   }
  });

  tv_gallery.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View v) {
    dialog.dismiss();
    // 从系统相册选取照片
    gallery();
   }
  });
 }

 /**
  * 拍照
  */
 public void camera() {
  // 判断存储卡是否可以用，可用进行存储
  if (hasSdcard()) {

   File dir = new File(IMAGE_DIR);
   if (!dir.exists()) {
    dir.mkdir();
   }
   tempFile = new File(dir,
     System.currentTimeMillis() + "_" + PHOTO_FILE_NAME);
   //从文件中创建uri
   Uri uri = Uri.fromFile(tempFile);
   Intent intent = new Intent();
   intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
   intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
   intent.addCategory(intent.CATEGORY_DEFAULT);
   // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
   startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
  } else {
   Toast.makeText(this, "未找到存储卡，无法拍照！", Toast.LENGTH_SHORT).show();
  }
 }

 /**
  * 判断sdcard是否被挂载
  */
 public boolean hasSdcard() {
  return Environment.getExternalStorageState().equals(
    Environment.MEDIA_MOUNTED);
 }


 /**
  * 从相册获取2
  */
 public void gallery() {
  Intent intent = new Intent(
    Intent.ACTION_PICK,
    MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
  startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
 }


 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (resultCode == RESULT_OK) {
   if (requestCode == PHOTO_REQUEST_GALLERY) {
    // 从相册返回的数据
    if (data != null) {
     // 得到图片的全路径
     Uri uri = data.getData();
     String[] proj = {MediaStore.Images.Media.DATA};
     //好像是android多媒体数据库的封装接口，具体的看Android文档
     Cursor cursor = managedQuery(uri, proj, null, null, null);
     //按我个人理解 这个是获得用户选择的图片的索引值
     int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
     //将光标移至开头 ，这个很重要，不小心很容易引起越界
     cursor.moveToFirst();
     //最后根据索引值获取图片路径
     String path = cursor.getString(column_index);


     uploadImage(path);
    }

   } else if (requestCode == PHOTO_REQUEST_CAREMA) {
    if (resultCode != RESULT_CANCELED) {
     // 从相机返回的数据
     if (hasSdcard()) {
      if (tempFile != null) {
       uploadImage(tempFile.getPath());
      } else {
       Toast.makeText(this, "相机异常请稍后再试！", Toast.LENGTH_SHORT).show();
      }

      Log.i("images", "拿到照片path=" + tempFile.getPath());
     } else {
      Toast.makeText(this, "未找到存储卡，无法存储照片！", Toast.LENGTH_SHORT).show();
     }
    }
   }

  }
 }

 Handler handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
   super.handleMessage(msg);
   if (msg.what == 0xAAAAAAAA) {
    photoPath(msg.obj.toString());
   }

  }
 };

 /**
  * 上传图片
  *
  * @param path
  */
 private void uploadImage(final String path) {
  new Thread() {
   @Override
   public void run() {
    if (new File(path).exists()) {
     Log.d("images", "源文件存在" + path);
    } else {
     Log.d("images", "源文件不存在" + path);
    }

    File dir = new File(IMAGE_DIR);
    if (!dir.exists()) {
     dir.mkdir();
    }
    final File file = new File(dir + "/temp_photo" + System.currentTimeMillis() + ".jpg");
    NativeUtil.compressBitmap(path, file.getAbsolutePath(), 50);
    if (file.exists()) {
     Log.d("images", "压缩后的文件存在" + file.getAbsolutePath());
    } else {
     Log.d("images", "压缩后的不存在" + file.getAbsolutePath());
    }
    Message message = new Message();
    message.what = 0xAAAAAAAA;
    message.obj = file.getAbsolutePath();
    handler.sendMessage(message);

   }
  }.start();

 }

 public void photoPath(String path) {
  Map<String,Object> map=new HashMap<>();
  map.put("path",path);
  datas.add(map);
  gridViewAddImgesAdpter.notifyDataSetChanged();
 }
}

7.GitHub源码 ：GridViewAddImage

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自由互联。