Android实现图片选择上传功能实例

效果图：

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<ImageItem> 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<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<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) {
      //添加图片返回
      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) {
      //预览图片返回
      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);
        //返回图片的地址
      }
    });
  }
}

Demo地址：https://github.com/yechaoa/UploadImage

以上就是全部内容，包含了代码，大家还有任何其他疑问可以在下方的留言讨论，感谢你对我们的支持。

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