上传图片

package com.bawei.zouye20190918.view.activity;

import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Retrofit;
import rx.Observable;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.bawei.zouye20190918.R;
import com.bawei.zouye20190918.contesact.ZConesact;
import com.bawei.zouye20190918.model.bean.QuanBean;
import com.bawei.zouye20190918.model.http.HttpApi;
import com.bawei.zouye20190918.model.http.HttpUtils;
import com.bawei.zouye20190918.model.http.ImageUtil;
import com.bawei.zouye20190918.presenter.CirclePresenter;

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

public class MainActivity extends BaseActivity implements ZConesact.Zview {

private Button btn;
private List<MultipartBody.Part> partList = new ArrayList<>();
private List<String> imagePaths = new ArrayList<>();
private LinearLayout linear_image;
private EditText edit;
private Button pinglun;

@Override
public void success(QuanBean bean) {

}

@Override
protected void initData() {

    pinglun.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(MainActivity.this,HomeActivity.class));
            Toast.makeText(MainActivity.this, "点击跳转", Toast.LENGTH_SHORT).show();
        }
    });

    btn.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.N)
        @Override
        public void onClick(View v) {
            //获取评论内容
            String editsing = edit.getText().toString().trim();
			
            //点击按钮访问图库
            Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(intent, 1);

            Retrofit retrofit = HttpUtils.getHttpUils().getRetrofit();
            HttpApi httpApi = retrofit.create(HttpApi.class);
			
            Observable<ResponseBody> circle = httpApi.circle(7452, "15690505883507452", 4, editsing, partList);
            circle.subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(new Subscriber<ResponseBody>() {
                        @Override
                        public void onCompleted() {

                        }

                        @Override
                        public void onError(Throwable e) {

                        }

                        @Override
                        public void onNext(ResponseBody responseBody) {
                            try {
                                String string = responseBody.string();

                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    });
        }
    });
}


//上传图片
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);


    Uri uri = data.getData();
    String path = ImageUtil.getImageAbsolutePath(MainActivity.this, uri);
    //将图片存入集合
    imagePaths.add(path);
    //清空集合
    partList.clear();
    if (imagePaths.size()>0 && imagePaths.size()<5){
        for (int i = 0; i < imagePaths.size(); i++) {
            ImageView imageView = (ImageView) linear_image.getChildAt(i);
            Bitmap bitmap = BitmapFactory.decodeFile(imagePaths.get(i));
            imageView.setImageBitmap(bitmap);

            File file = new File(imagePaths.get(i));
            RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data;charset=UTF-8"), file);
            MultipartBody.Part part = MultipartBody.Part.createFormData("image", file.getName(), requestBody);
            partList.add(part);
        }
    }else{
        Toast.makeText(this, "最多上传四张图片", Toast.LENGTH_SHORT).show();
    }

}

@Override
protected CirclePresenter setPresenter() {
    return new CirclePresenter();
}


@Override
protected void initView() {
    edit = findViewById(R.id.main_edit);
    btn = findViewById(R.id.main_btn);
    linear_image = findViewById(R.id.linear_image);
    pinglun = findViewById(R.id.main_pinglun);
}

@Override
protected int setLayout() {
    return R.layout.activity_main;
}

}
XML

<?xml version="1.0" encoding="utf-8"?>

<EditText
    android:layout_margin="10dp"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:hint="请输入评论"
    android:id="@+id/main_edit"></EditText>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="图片上传"
    android:id="@+id/main_btn"></Button>


<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:id="@+id/linear_image"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/image1"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_margin="5dp"></ImageView>

    <ImageView
        android:id="@+id/image2"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_margin="5dp"></ImageView>

    <ImageView
        android:id="@+id/image3"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_margin="5dp"></ImageView>
    <ImageView
        android:id="@+id/image4"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_margin="5dp"></ImageView>
</LinearLayout>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/main_pinglun"
    android:text="提交评论"></Button>

方式二

package com.example.rxrretrofit.activity;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.example.rxrretrofit.R;
import com.example.rxrretrofit.bean.Result;
import com.example.rxrretrofit.bean.User;
import com.example.rxrretrofit.db.UserDao;
import com.example.rxrretrofit.http.DataCall;
import com.example.rxrretrofit.presenter.SendImagePresenter;

import butterknife.BindView;
import butterknife.OnClick;

public class SendImageActivity extends BaseActivity{
@BindView(R.id.image)
ImageView mImage;

@BindView(R.id.text)
EditText mText;

@BindView(R.id.btn_send)
Button mSend;

SendImagePresenter sendImagePresenter;
User data;

@Override
protected void initView(Bundle savedInstanceState) {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
    }
    sendImagePresenter = new SendImagePresenter(new ImageCall());
    data = userDao.queryBuilder().where(UserDao.Properties.Login.eq(true)).unique();

}

@Override
protected int getLayoutId() {
    return R.layout.activity_add_circle;
}

@OnClick(R.id.image)
public void image(View view) {
    Intent intent = new Intent(
            Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, 100);
}
String filePath;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK && requestCode == 100) {//resultcode是setResult里面设置的code值
        Uri uri = data.getData();
        Glide.with(this).load(uri).into(mImage);

        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor actualimagecursor = managedQuery(uri, proj, null, null, null);
        int actual_image_column_index = actualimagecursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        actualimagecursor.moveToFirst();
        filePath = actualimagecursor
                .getString(actual_image_column_index);
        // 4.0以上平台会自动关闭cursor,所以加上版本判断,OK
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH)
            actualimagecursor.close();
    }

}


@OnClick(R.id.btn_send)
public void send(View view) {
    sendImagePresenter.requestData(String.valueOf(data.getUserId()),data.getSessionId(),
            mText.getText().toString(),filePath);
}

class ImageCall implements DataCall{

    @Override
    public void success(Object data) {
        Toast.makeText(getBaseContext(),"上传成功",Toast.LENGTH_LONG).show();
    }

    @Override
    public void fail(Result result) {

    }
}

}
XML

<?xml version="1.0" encoding="utf-8"?>

<Button
    android:id="@+id/btn_send"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:text="发布"/>
<EditText
    android:id="@+id/text"
    android:layout_width="fill_parent"
    android:layout_height="100dp"
    android:layout_below="@+id/btn_send"
    android:layout_alignParentLeft="true"
    android:background="@android:color/transparent"
    android:gravity="center"
    android:hint="心情如何..."
    android:maxLength="140"
    android:padding="15dp"
    android:textSize="16sp"></EditText>

<ImageView
    android:id="@+id/image"
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:layout_below="@+id/text"
    android:src="@mipmap/ic_launcher"
    android:layout_alignParentLeft="true">

</ImageView>