Question

我是学生，只学习Android开发几天，有一个问题是如何在没有用户界面的情况下在后台上传图像。

我的意思是已经有了文件路径，我不需要用户点击选择图片，当用户运行活动时，图片会自动上传。我知道我可以使用okhttp3，例如下面的视频：

https://www.youtube.com/watch?v=K48jnbM8yS4 （我认为这是好视频，是我的傻瓜，不知道如何修改代码）

但是，在视频中，MainActivity如此

package app.file_upload;

import android.Manifest;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.MimeTypeMap;
import android.widget.Button;

import com.nbsp.materialfilepicker.MaterialFilePicker;
import com.nbsp.materialfilepicker.ui.FilePickerActivity;

import java.io.File;
import java.io.IOException;

import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class UploadActivity extends AppCompatActivity {

    private Button button;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.button);


        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            if(ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
                requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},100);
                return;
            }
        }

        enable_button();
    }

    private void enable_button() {

            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    new MaterialFilePicker()
                            .withActivity(UploadActivity.this)
                            .withRequestCode(10)
                            .start();

                }
            });
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if(requestCode == 100 && (grantResults[0] == PackageManager.PERMISSION_GRANTED)){
            enable_button();
        }else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},100);
            }
        }
    }

    ProgressDialog progress;

    @Override
    protected void onActivityResult(int requestCode, int resultCode, final Intent data) {
        if(requestCode == 10 && resultCode == RESULT_OK){

            progress = new ProgressDialog(UploadActivity.this);
            progress.setTitle("Uploading");
            progress.setMessage("Please wait...");
            progress.show();

            Thread t = new Thread(new Runnable() {
                @Override
                public void run() {

                    File f  = new File(data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH));
                    String content_type  = getMimeType(f.getPath());

                    String file_path = f.getAbsolutePath();
                    OkHttpClient client = new OkHttpClient();
                    RequestBody file_body = RequestBody.create(MediaType.parse(content_type),f);

                    RequestBody request_body = new MultipartBody.Builder()
                            .setType(MultipartBody.FORM)
                            .addFormDataPart("type",content_type)
                            .addFormDataPart("uploaded_file",file_path.substring(file_path.lastIndexOf("/")+1), file_body)
                            .build();

                    Request request = new Request.Builder()
                            .url("URL_TO_THE_SERVER/YOUR_SCRIPT.php")
                            .post(request_body)
                            .build();

                    try {
                        Response response = client.newCall(request).execute();

                        if(!response.isSuccessful()){
                            throw new IOException("Error : "+response);
                        }

                        progress.dismiss();

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


                }
            });

            t.start();




        }
    }

    private String getMimeType(String path) {

        String extension = MimeTypeMap.getFileExtensionFromUrl(path);

        return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    }
}

对于我的情况，我只上传图片，但是我不需要用户界面（比如选择图片的按钮），所以我试着修改代码，如下图所示：

public class MainActivity extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        File f = new File(" /storage/emulated/0/Android/data/abc.package.name/files/images.jpg");
        String content_type  = getMimeType(f.getPath());
        String file_path = f.getAbsolutePath();

        OkHttpClient client = new OkHttpClient();
        RequestBody file_body = RequestBody.create(MediaType.parse(content_type),f);

        RequestBody request_body = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("type",content_type)
                .addFormDataPart("uploaded_file",file_path.substring(file_path.lastIndexOf("/")+1), file_body)
                .build();

        Request request = new Request.Builder()
                .url("My php File Link ")
                .post(request_body)
                .build();

        try {
            Response response = client.newCall(request).execute();

            if(!response.isSuccessful()){
                throw new IOException("Error : "+response);
            }


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


    }












    private String getMimeType(String path) {

        String extension = MimeTypeMap.getFileExtensionFromUrl(path);

        return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    }
}

我只需要使用okhttp3在后台任务上传图像，不需要任何界面，但我觉得我很难，也许我是android studio的新用户...＆gt; _＆lt;

任何人都可以帮我修改代码....

我的PHP代码也在这里：

<?php 

    $file_path = "images/";

    $file_path = $file_path . basename($_FILES['uploaded_file']['name']);

    if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'],$file_path)) {
        echo "success";
    }else {
        echo "error";
    }


 ?>

没有界面的Android上传图片（Okhttp3）

0 个答案: