涉及到的内容 ：

1、图片剪切，2、图片保存到SD卡 3、文件读取和保存 4、自定义View 绘制平滑曲线
5、RecycleView 显示 6、Glide框架显示图片 7、大图片显示 8、从相册选择图片

所用设备：

三星 华为 平板

目录结构

目录结构

recycleViewAdapter显示页面简单封装

1.Adapter

 

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by Administrator on 2017/4/20 0020.
 * 图片浏览
 */

public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.MyHolder> {

    private Context context;
    private List<ImageModel> list;


    /*按钮监听*/
    public interface OnItemClickListener {
        void onItemClick(ImageModel dataBena);
    }

    public OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    public ImageAdapter(Context context) {
        this.context = context;
        list = new ArrayList<>();
    }

    @Override
    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_image, parent, false);
        MyHolder  vh = new MyHolder(view);
        return vh;
    }

    @Override
    public void onBindViewHolder(final MyHolder holder, int position) {
        final ImageModel model = list.get(position);
        Glide.with(context).load(model.getImagepath())
                .centerCrop()
                .override(300, 300)
                .into(holder.image);
        holder.tvName.setText(model.getImageName() + "");

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (onItemClickListener != null){
                    onItemClickListener.onItemClick(model);
                }
            }
        });


    }


    @Override
    public int getItemCount() {
        return list.size();
    }

    public void addAll(Collection collection) {
        list.addAll(collection);
        notifyDataSetChanged();

    }

    public void remove() {
        list.clear();
    }


    public class MyHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.image)
        ImageView image;
        @BindView(R.id.tv_name)
        TextView tvName;

        public MyHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }
}

2.MainActivity显示布局

 

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

import com.alvasystems.arsdk.facepoint.utils.CheckPermissionsUtil;
import com.alvasystems.arsdk.facepoint.utils.FileUtil;
import com.alvasystems.arsdk.facepoint.zxpaint.PaintActivity;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity implements ImageReShowAdapter.OnItemClickListener {
 
    private static String SAVEPATH = "/sdcard/DCIM/savealva/save.txt";
    @BindView(R.id.recycle)
    RecyclerView recycle;


    private ImageReShowAdapter adapter;
    private List<ImageModel> list = new ArrayList<>();
    private List<ImageModel> listsave = new ArrayList<>();
    private final String path = "/sdcard/Alarms";
    private final String savePath = "/sdcard/DCIM/alva";
    private File root = new File(path);
    private File saveRoot = new File(savePath);

    private String saveName;
    private String[] splits;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        CheckPermissionsUtil checkPermissionsUtil = new CheckPermissionsUtil(this);
        checkPermissionsUtil.requestAllPermission(this);
        initView();
    }




    @Override
    protected void onResume() {
        super.onResume();
        try {
            saveName = FileUtil.readSDCard(SAVEPATH);
            splits = saveName.split(",");
            Log.e(TAG, "输出信息-->: " + Arrays.toString(splits));
            initData(root);
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(TAG, "输出信息-->: 文件读取错误 MainActivity");
            initData(root);
        }


    }

    /*初始化View*/
    private void initView() {
        adapter = new ImageReShowAdapter(this);
        recycle.setItemAnimator(new DefaultItemAnimator());
        //recycle.setLayoutManager(new LinearLayoutManager(this));
        recycle.setLayoutManager(new GridLayoutManager(this, 4));
        recycle.setAdapter(adapter);
        adapter.setOnItemClickListener(this);

    }

    /*加载数据*/
    private void initData(File root) {
        Log.e(TAG, "输出信息-->:root " + root);
        list.clear();
        adapter.remove();
        File[] files = root.listFiles();
        if (files != null) {
            for (File f : files) {
                if (f.isDirectory()) {
                    initData(f);
                } else {
                    ImageModel model = new ImageModel();
                    model.setImageName(f.getName());
                    model.setImagepath(f.getAbsolutePath());
                    model.setFile(f);
                    list.add(model);
                }
            }

            /*判断是否有对图像有操作过的 */
            for (int i = 0; i < list.size(); i++) {
                if (splits != null) {
                    for (int j = 0; j < (splits.length - 1); j++) {
                        if (list.get(i).getImageName().equals(splits[j].trim())) {
                            Log.e(TAG, "输出信息-->: " + splits[j].trim());
                            list.remove(i);
                            Log.e(TAG, "输出信息-->: " + list.size());

                        }
                    }
                }
            }

 
            adapter.addAll(list);
            adapter.notifyDataSetChanged();
        } else {
            Log.e(TAG, "输出信息-->: files[] is null 怎么办呢!!");
        }


    }


  
    /*点击itme 传递给下一个页面*/
    @Override
    public void onItemClick(ImageModel dataBena) {
        String path = dataBena.getImagepath();
        String name = dataBena.getImageName();
        File file = dataBena.getFile();

        Log.e(TAG, "输出信息-->: " + path + "--name--" + name);
        if (!path.isEmpty()) {
            Bundle bundle = new Bundle();
            bundle.putSerializable("model", dataBena);
            PaintActivity.PainParams params = new PaintActivity.PainParams();
            params.mImagePath = path;
            PaintActivity.startActivity(MainActivity.this, params, bundle);

        }

    }

}