效果圖：

后來又出了兩篇，也可以看一下

Android選擇與上傳圖片之PictureSelector教程

Android選擇與上傳圖片之Matisse教程

添加依賴：

選擇圖片：compile ’com.lzy.widget:imagepicker:0.5.4’

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

上傳文件：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<ImageItem> selImageList; //當前選擇的所有圖片 private int maxImgCount = 8; //允許選擇圖片最大數 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執行initImagePicker();initWidget(); } private void initImagePicker() {ImagePicker imagePicker = ImagePicker.getInstance();imagePicker.setImageLoader(new GlideImageLoader()); //設置圖片加載器imagePicker.setShowCamera(true); //顯示拍照按鈕imagePicker.setCrop(true); //允許裁剪（單選才有效）imagePicker.setSaveRectangle(true); //是否按矩形區域保存imagePicker.setSelectLimit(maxImgCount); //選中數量限制imagePicker.setMultiMode(false); //多選imagePicker.setStyle(CropImageView.Style.RECTANGLE); //裁剪框的形狀imagePicker.setFocusWidth(800); //裁剪框的寬度。單位像素（圓形自動取寬高最小值）imagePicker.setFocusHeight(800); //裁剪框的高度。單位像素（圓形自動取寬高最小值）imagePicker.setOutPutX(1000); //保存文件的寬度。單位像素imagePicker.setOutPutY(1000); //保存文件的高度。單位像素 } 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<String> 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<String> names = new ArrayList<>();names.add('拍照');names.add('相冊');showDialog(new SelectDialog.SelectDialogListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {switch (position) { case 0: // 直接調起相機//打開選擇,本次允許選擇的數量ImagePicker.getInstance().setSelectLimit(maxImgCount - selImageList.size());Intent intent = new Intent(MainActivity.this, ImageGridActivity.class);intent.putExtra(ImageGridActivity.EXTRAS_TAKE_PICKERS,true); // 是否是直接打開相機startActivityForResult(intent, REQUEST_CODE_SELECT);break; case 1://打開選擇,本次允許選擇的數量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://打開預覽Intent intentPreview = new Intent(this, ImagePreviewDelActivity.class);intentPreview.putExtra(ImagePicker.EXTRA_IMAGE_ITEMS, (ArrayList<ImageItem>) 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) { //添加圖片返回 if (data != null && requestCode == REQUEST_CODE_SELECT) {ArrayList<ImageItem> images = (ArrayList<ImageItem>) data.getSerializableExtra(ImagePicker.EXTRA_RESULT_ITEMS);if (images != null){ selImageList.addAll(images); adapter.setImages(selImageList);} }} else if (resultCode == ImagePicker.RESULT_CODE_BACK) { //預覽圖片返回 if (data != null && requestCode == REQUEST_CODE_PREVIEW) {ArrayList<ImageItem> images = (ArrayList<ImageItem>) 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<ImageItem> 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);//返回圖片的地址 }}); } }

Demo地址：點此下載

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