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
<androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recyclerView"android:layout_width="match_parent"android:layout_height="wrap_content" />
3.编写两个item页面为recycleview的子页面
<?xml version="1.0" encoding="utf-8"?>
<Button xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/btnAdd"android:layout_width="100dp"android:layout_height="120dp"android:layout_margin="4dp"android:layout_weight="1"android:text="Add"/>
//点击添加按钮
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"android:padding="8dp"><ImageViewandroid:id="@+id/imgView"android:layout_width="100dp"android:layout_height="100dp"/></LinearLayout>
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<RecyclerView.ViewHolder> {private final int VIEW_TYPE_IMAGE = 0;private final int VIEW_TYPE_ADD_BUTTON = 1;private ArrayList<Uri> 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);}}@Overridepublic 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() {@Overridepublic void onClick(View v) {Intent intent=new Intent(context,emptyActivity.class);intent.putExtra("url",uri.toString());context.startActivity(intent);}});}}@Overridepublic int getItemCount() {// Plus one for the add buttonreturn imageUris.size() + 1}@Overridepublic 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;@Overrideprotected 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);}@Overridepublic 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
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><ImageViewandroid:id="@+id/img"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_centerVertical="true"/></RelativeLayout>
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;@Overrideprotected 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);}
}
