Android选择与上传图片之ImagePicker教程

效果图：

后来又出了两篇，也可以看一下

Android选择与上传图片之PictureSelector教程

Android选择与上传图片之Matisse教程

添加依赖：

选择图片：compile 'com.lzy.widget:imagepicker:0.5.4'

github地址：https://github.com/jeasonlzy/ImagePicker

上传文件：compile 'com.zhy:okhttputils:2.6.2'

github地址：https://github.com/hongyangAndroid/okhttputils

MainActivity.java

package com.yechaoa.uploadimage; import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;import android.widget.AdapterView; import com.lzy.imagepicker.ImagePicker;import com.lzy.imagepicker.bean.ImageItem;import com.lzy.imagepicker.ui.ImageGridActivity;import com.lzy.imagepicker.ui.ImagePreviewDelActivity;import com.lzy.imagepicker.view.CropImageView; import java.util.ArrayList;import java.util.List; import okhttp3.Call; public class MainActivity extends AppCompatActivity implements ImagePickerAdapter.OnRecyclerViewItemClickListener{     public static final int IMAGE_ITEM_ADD = -1;    public static final int REQUEST_CODE_SELECT = 100;    public static final int REQUEST_CODE_PREVIEW = 101;     private ImagePickerAdapter adapter;    private ArrayList selImageList; //当前选择的所有图片    private int maxImgCount = 8;               //允许选择图片最大数     private HttpUtil httpUtil;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);         httpUtil = new HttpUtil();         findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                uploadImage(selImageList);            }        });         //最好放到 Application oncreate执行        initImagePicker();        initWidget();     }     private void initImagePicker() {        ImagePicker imagePicker = ImagePicker.getInstance();        imagePicker.setImageLoader(new GlideImageLoader());   //设置图片加载器        imagePicker.setShowCamera(true);                      //显示拍照按钮        imagePicker.setCrop(true);                            //允许裁剪（单选才有效）        imagePicker.setSaveRectangle(true);                   //是否按矩形区域保存        imagePicker.setSelectLimit(maxImgCount);              //选中数量限制        imagePicker.setMultiMode(false);                      //多选        imagePicker.setStyle(CropImageView.Style.RECTANGLE);  //裁剪框的形状        imagePicker.setFocusWidth(800);                       //裁剪框的宽度。单位像素（圆形自动取宽高最小值）        imagePicker.setFocusHeight(800);                      //裁剪框的高度。单位像素（圆形自动取宽高最小值）        imagePicker.setOutPutX(1000);                         //保存文件的宽度。单位像素        imagePicker.setOutPutY(1000);                         //保存文件的高度。单位像素    }     private void initWidget() {        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);        selImageList = new ArrayList<>();        adapter = new ImagePickerAdapter(this, selImageList, maxImgCount);        adapter.setOnItemClickListener(this);         recyclerView.setLayoutManager(new GridLayoutManager(this, 4));        recyclerView.setHasFixedSize(true);        recyclerView.setAdapter(adapter);    }     private SelectDialog showDialog(SelectDialog.SelectDialogListener listener, List names) {        SelectDialog dialog = new SelectDialog(this, R.style.transparentFrameWindowStyle, listener, names);        if (!this.isFinishing()) {            dialog.show();        }        return dialog;    }     @Override    public void onItemClick(View view, int position) {        switch (position) {            case IMAGE_ITEM_ADD:                List names = new ArrayList<>();                names.add("拍照");                names.add("相册");                showDialog(new SelectDialog.SelectDialogListener() {                    @Override                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                        switch (position) {                            case 0: // 直接调起相机                                //打开选择,本次允许选择的数量                                ImagePicker.getInstance().setSelectLimit(maxImgCount - selImageList.size());                                Intent intent = new Intent(MainActivity.this, ImageGridActivity.class);                                intent.putExtra(ImageGridActivity.EXTRAS_TAKE_PICKERS,true); // 是否是直接打开相机                                startActivityForResult(intent, REQUEST_CODE_SELECT);                                break;                            case 1:                                //打开选择,本次允许选择的数量                                ImagePicker.getInstance().setSelectLimit(maxImgCount - selImageList.size());                                Intent intent1 = new Intent(MainActivity.this, ImageGridActivity.class);                                startActivityForResult(intent1, REQUEST_CODE_SELECT);                                break;                            default:                                break;                        }                    }                }, names);                break;            default:                //打开预览                Intent intentPreview = new Intent(this, ImagePreviewDelActivity.class);                intentPreview.putExtra(ImagePicker.EXTRA_IMAGE_ITEMS, (ArrayList) adapter.getImages());                intentPreview.putExtra(ImagePicker.EXTRA_SELECTED_IMAGE_POSITION, position);                intentPreview.putExtra(ImagePicker.EXTRA_FROM_ITEMS,true);                startActivityForResult(intentPreview, REQUEST_CODE_PREVIEW);                break;        }    }     @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (resultCode == ImagePicker.RESULT_CODE_ITEMS) {            //添加图片返回            if (data != null && requestCode == REQUEST_CODE_SELECT) {                ArrayList images = (ArrayList) data.getSerializableExtra(ImagePicker.EXTRA_RESULT_ITEMS);                if (images != null){                    selImageList.addAll(images);                    adapter.setImages(selImageList);                }            }        } else if (resultCode == ImagePicker.RESULT_CODE_BACK) {            //预览图片返回            if (data != null && requestCode == REQUEST_CODE_PREVIEW) {                ArrayList images = (ArrayList) data.getSerializableExtra(ImagePicker.EXTRA_IMAGE_ITEMS);                if (images != null){                    selImageList.clear();                    selImageList.addAll(images);                    adapter.setImages(selImageList);                }            }        }    }     private String url="http...";     private void uploadImage(ArrayList pathList) {        httpUtil.postFileRequest(url, null, pathList, new MyStringCallBack() {             @Override            public void onError(Call call, Exception e, int id) {                super.onError(call, e, id);            }             @Override            public void onResponse(String response, int id) {                super.onResponse(response, id);                //返回图片的地址            }        });    } }

Demo地址：点此下载

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