校园随手拍之Android从相册选取图片或拍摄图片并上传（kotlin版）

前言：我在完成大作业的时候对这一部分不太懂，后来经过查阅资料，觉得这个可以作为一个模块来使用。故写此文章来帮助自己记忆。

需要上传图片的界面：

AndroidManifest.xml配置

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.civilizedcampus"><uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" /><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:requestLegacyExternalStorage="true"android:label="@string/app_name"android:largeHeap="true"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/Theme.CivilizedCampus"><!-- 必须与后面的Provider中的authorities相同 --><providerandroid:authorities="com.example.civilizedcampus.fileProvider"android:name="androidx.core.content.FileProvider"android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/file_path"/></provider><activityandroid:name=".SubmitActivity"android:exported="false" /><activity android:name=".Register" /><activity android:name=".Login" /><activityandroid:name=".MainActivity"android:exported="true"android:launchMode="singleTask"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

file_path配置资源：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android"><external-pathname="mt-image"path="."/>
</paths>

核心代码：

package com.example.civilizedcampusimport android.annotation.SuppressLint
import android.content.ContentUris
import android.content.Intent
import android.content.pm.PackageManager
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.net.Uri
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Environment
import android.provider.DocumentsContract
import android.provider.MediaStore
import android.util.Log
import android.view.View
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.annotation.RequiresApi
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.core.content.FileProvider
import com.bumptech.glide.Glide
import okhttp3.*
import okhttp3.MediaType.Companion.toMediaTypeOrNull
import okhttp3.RequestBody.Companion.asRequestBody
import org.json.JSONObject
import java.io.BufferedOutputStream
import java.io.File
import java.io.FileOutputStream
import java.io.IOExceptionclass SubmitActivity : AppCompatActivity() , View.OnClickListener{private var dialog:MyDialog?=nullprivate val TAKE_PICTURE=0private val CHOOSE_PICTURE=1var imageUrl = ""var imageUri:Uri?=nullval tag = "Tag"private val permissions = arrayOf("Manifest.permission.CAMERA","Manifest.permission.READ_EXTERNAL_STORAGE","Manifest.permission.WRITE_EXTERNAL_STORAGE","Manifest.permission.MANAGE_EXTERNAL_STORAGE")override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_submit)val imageView = this.findViewById<ImageView>(R.id.iv_choose_pictures)imageView.setOnClickListener {RequestPermissions()dialog = MyDialog(this)dialog!!.show()dialog!!.window?.findViewById<TextView>(R.id.camera)?.setOnClickListener(this)dialog!!.window?.findViewById<TextView>(R.id.photo)?.setOnClickListener(this)dialog!!.window?.findViewById<TextView>(R.id.cancel)?.setOnClickListener(this)}}private fun RequestPermissions(){for (p in permissions){if(ContextCompat.checkSelfPermission(this, p)!=PackageManager.PERMISSION_GRANTED){ActivityCompat.requestPermissions(this, permissions,2)}}}override fun onRequestPermissionsResult(requestCode: Int,permissions: Array<out String>,grantResults: IntArray) {super.onRequestPermissionsResult(requestCode, permissions, grantResults)when(requestCode){2->{for(p in grantResults){if (grantResults.isNotEmpty() &&p==PackageManager.PERMISSION_GRANTED){Log.d(tag, "onRequestPermissionsResult: 成功申请到$p")}else{Toast.makeText(this, "${p}未成功申请成功", Toast.LENGTH_SHORT).show()}}}}}override fun onClick(v: View?) {if(v == null) {Log.d("dialog", "null")return}when(v.id){R.id.camera-> {Log.d("dialog", "camera")val outImage = File(externalCacheDir, "outPut_image.jpg")try {if(outImage.exists()){outImage.delete()}outImage.createNewFile()}catch (e:Exception){e.printStackTrace()}if(Build.VERSION.SDK_INT>=24){imageUri = FileProvider.getUriForFile(this,"com.example.civilizedcampus.fileProvider", outImage)}else{imageUri = Uri.fromFile(outImage)}val openCameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri)startActivityForResult(openCameraIntent, TAKE_PICTURE)dialog?.dismiss()}R.id.photo -> {Log.d("dialog", "photo")val openAlbumIntent = Intent(Intent.ACTION_GET_CONTENT)openAlbumIntent.type="image/*"startActivityForResult(openAlbumIntent, CHOOSE_PICTURE)dialog?.dismiss()}R.id.cancel -> {Log.d("dialog", "cancel")dialog?.dismiss()}}}override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {super.onActivityResult(requestCode, resultCode, data)if(resultCode== RESULT_OK){when(requestCode){CHOOSE_PICTURE ->{if (data!=null){if (Build.VERSION.SDK_INT>=19){handleImageONKitKat(data)}else{handleImageBeforeKitKat(data)}val image=this.findViewById<ImageView>(R.id.iv_choose_pictures)Glide.with(this).load(imageUrl).into(image)}}TAKE_PICTURE ->{try {val bitmap = BitmapFactory.decodeStream(imageUri?.let {contentResolver.openInputStream(it)})Log.d(tag,"take success")imageUrl = uploadImage(saveFile(bitmap))val image=this.findViewById<ImageView>(R.id.iv_choose_pictures)Glide.with(this).load(imageUrl).into(image)Log.d(tag,"imageUrl=$imageUrl")}catch (e:Exception){e.printStackTrace()}}}}}@RequiresApi(api = Build.VERSION_CODES.KITKAT)fun handleImageONKitKat(data:Intent){val uri = data.datavar imagePath:String? = nullLog.d(tag,"uri=$uri")if (uri==null){Log.d(tag,"uri wrong")}else{if(DocumentsContract.isDocumentUri(this,uri)){val docId = DocumentsContract.getDocumentId(uri)Log.d(tag,"docId=$docId")if("com.android.providers.media.documents" == uri.authority){val id = docId.split(":")[1]Log.d(tag,"id=$id")val selection = "${MediaStore.Images.Media._ID}=$id"Log.d(tag,"selection=$selection")imagePath=getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection)Log.d(tag,"imagePath=$imagePath")}else if("com.android.providers.downloads.documents"==uri.authority){val contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),docId.toLong(),)Log.d(tag,"contentUri=$contentUri")imagePath=getImagePath(contentUri,null)}}else if ("content".equals(uri.scheme,true)){imagePath = getImagePath(uri,null)}else if ("file".equals(uri.scheme,true)){imagePath = uri.path}val file = imagePath?.let { saveFile(it) }if (file!=null){imageUrl=uploadImage(file)Log.d(tag,"imageUrl=$imageUrl")}}}fun handleImageBeforeKitKat(data:Intent){val uri = data.dataval file = uri?.let { getImagePath(it,null)?.let { saveFile(it) } }if (file!=null){imageUrl=uploadImage(file)Log.d(tag,"imageUrl=$imageUrl")}}@SuppressLint("Range")private fun getImagePath(uri: Uri, Selection:String?):String?{var path:String? = nullval cursor = contentResolver.query(uri, null, Selection, null,null)if(cursor!=null){if(cursor.moveToFirst()){path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA))}cursor.close()}return path}private fun saveFile(imagePath:String):File?{if(imagePath!=null){val bitmap = BitmapFactory.decodeFile(imagePath)val file = File("${Environment.getExternalStorageDirectory().absolutePath}/image.jpg")if (file.exists()){file.delete()}try {val bos = BufferedOutputStream(FileOutputStream(file))bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos)bos.flush()bos.close()}catch (e:IOException){e.printStackTrace()}return file}else{return null}}private fun saveFile(bitmap: Bitmap):File{val file = File("${Environment.getExternalStorageDirectory().absolutePath}/image.jpg")if (file.exists()){file.delete()}try {val bos = BufferedOutputStream(FileOutputStream(file))bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos)bos.flush()bos.close()}catch (e:IOException){e.printStackTrace()}return file}private fun uploadImage(file: File):String{val client = OkHttpClient()var result=""val url = "your upload url"val image = file.asRequestBody("image/jpg".toMediaTypeOrNull())val requestBody = MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", file.name, image).build()val request = Request.Builder().url(url).post(requestBody).build()client.newCall(request).enqueue(object: Callback{override fun onFailure(call: Call, e: IOException) {Log.d(tag,"网络错误")e.printStackTrace()}override fun onResponse(call: Call, response: Response) {if (response.body!=null){Log.d(tag,"upload success")val jsonObject = JSONObject(response.body!!.string())result = jsonObject.optString("data")}}})Thread.sleep(1000)return result}
}

相关资料：大佬的博客
github仓库地址：传送门

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