MainActivity.java

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Base64;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
	
	// 配置API地址
    private static final String API = "YOUR API";

    // 要上传的文件路径
    public String path = “FILE PATH”;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

		// 点击 fab 执行图片上传
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new Thread() {
                    @Override
                    public void run() {
                        verifyStoragePermissions(MainActivity.this); // Android 6.0 要请求用户授权
                        Bitmap image = BitmapFactory.decodeFile(path);
                        new UploadImage(image, "test", 1).execute();
                    }
                }.start();
            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private class UploadImage extends AsyncTask<Void, Void, Void>{
        Bitmap image; // 要上传的图片
        String name; // 图片文件名
        int id;
        String content; // 接收返回信息

        public UploadImage(Bitmap image, String name, int id){
            this.image = image;
            this.name = name;
            this.id = id;
        }


        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            Toast.makeText(getApplicationContext(), "Uploaded", Toast.LENGTH_SHORT).show();

            // 解析返回的json
            jsonParser(content);
            Toast.makeText(getApplicationContext(), Data + " " + info + " " + code, Toast.LENGTH_SHORT).show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // 给图片编码为Base64
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            image.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
            byte[] b = baos.toByteArray();
            String encodedImage = Base64.encodeToString(b, Base64.DEFAULT);

            // 添加请求的参数
            ArrayList<NameValuePair> dataToSend = new ArrayList<>();
            dataToSend.add(new BasicNameValuePair("image", encodedImage));
            dataToSend.add(new BasicNameValuePair("name", name));
            dataToSend.add(new BasicNameValuePair("id", Integer.toString(id)));

            HttpParams httpRequestParams = getHttpRequestParams();
            HttpClient client = new DefaultHttpClient(httpRequestParams);
            HttpPost post = new HttpPost(API);
            try{
                post.setEntity(new UrlEncodedFormEntity(dataToSend));
                HttpResponse response = client.execute(post);

                // 获取识别结果
                content = EntityUtils.toString(response.getEntity());
                //Log.i("content", content);

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

            return null;
        }
    }

    private HttpParams getHttpRequestParams(){
        HttpParams httpRequestParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpRequestParams, 1000 * 30);
        HttpConnectionParams.setSoTimeout(httpRequestParams, 1000 * 30);
        return httpRequestParams;
    }



    public String code = "";
    public String info = "";
    public String Data = "";

    // 解析返回的json
	public void jsonParser(String resultJsonStr){
        JSONObject object = null;
        try {
            object = (JSONObject) new JSONTokener(resultJsonStr).nextValue();
            code = object.getString("code"); // 状态代码, 200表示成功
            info = object.getString("info"); // 状态, Success表示成功
            if(code.equals("200")){
                // 这个retData 就是要的数据,现在里面只有Data一项,未来可以加
                JSONObject retData = (JSONObject) new JSONTokener(object.getString("data")).nextValue();
                Data = retData.getString("Data"); // 返回的信息
            }
            Log.i("code", code);
            Log.i("info", info);
            Log.i("Data", Data);

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

    // Android 6.0 请求权限
    private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
    };

    /**
     * Checks if the app has permission to write to device storage
     *
     * If the app does not has permission then the user will be prompted to grant permissions
     *
     * @param activity
     */
    public static void verifyStoragePermissions(Activity activity) {
        // Check if we have write permission
        int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.READ_EXTERNAL_STORAGE);

        if (permission != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(
                    activity,
                    PERMISSIONS_STORAGE,
                    REQUEST_EXTERNAL_STORAGE
            );
        }
    }
}