白云做网站,网站翻页,wordpress加速教程,网站开发外文翻译1. 核心代码
打开系统相册功能#xff0c;本代码使用两种方式打开本地相册#xff0c;startActivityForResult 已经废弃#xff0c;可以使用新的方式。
package com.example.facedetectordemoimport android.content.pm.PackageManager
import androidx.appcompat.app.App…1. 核心代码
打开系统相册功能本代码使用两种方式打开本地相册startActivityForResult 已经废弃可以使用新的方式。
package com.example.facedetectordemoimport android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.TextView
import androidx.activity.result.contract.ActivityResultContracts
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.example.facedetectordemo.databinding.ActivityMainBinding
import com.example.facedetectordemo.entity.FaceInfo
import android.Manifest;
import android.annotation.SuppressLint
import android.annotation.TargetApi
import android.app.Activity
import android.content.ContentUris
import android.content.Intent
import android.graphics.BitmapFactory
import android.net.Uri
import android.os.Build
import android.provider.DocumentsContract
import android.provider.MediaStore
import com.google.android.material.snackbar.Snackbarclass MainActivity : AppCompatActivity() {private lateinit var binding: ActivityMainBindingprivate val CHOOSE_PHOTO 1private val requestPermissionLauncher registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted: Boolean -if (isGranted) {Log.i(Permission: , Granted)} else {Log.i(Permission: , Denied)}}private val launcherActivity registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {val data it.dataif (it.resultCode Activity.RESULT_OK) {// 判断手机系统版本号if (Build.VERSION.SDK_INT 19) {// 4.4及以上系统使用这个方法处理图片if (data ! null) {if(data.clipData ! null) {handleImageOnKitKat(data.clipData!!.getItemAt(0).uri)} else if(data.data ! null) {handleImageOnKitKat(data.data!!)}}}}}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)binding ActivityMainBinding.inflate(layoutInflater)setContentView(binding.root)// Example of a call to a native methodbinding.openGallery.setOnClickListener{val intent Intent(android.intent.action.GET_CONTENT)intent.type image/* // */intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)//startActivityForResult(intent, CHOOSE_PHOTO) // 打开相册, 废弃APIlauncherActivity.launch(intent)}val infos getFaceInfoList()Log.d(zhouyong, onCreate: size infos.size)requestPermission();}override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {super.onActivityResult(requestCode, resultCode, data)when (requestCode) {CHOOSE_PHOTO - if (resultCode Activity.RESULT_OK) {// 判断手机系统版本号if (Build.VERSION.SDK_INT 19) {// 4.4及以上系统使用这个方法处理图片if (data ! null) {if(data.clipData ! null) {handleImageOnKitKat(data.clipData!!.getItemAt(0).uri)} else if(data.data ! null) {handleImageOnKitKat(data.data!!)}}} else {}}else - {}}}TargetApi(19)private fun handleImageOnKitKat(uri: Uri) {var imagePath: String? null//val uri data.dataLog.d(TAG, handleImageOnKitKat: uri is $uri)if (DocumentsContract.isDocumentUri(this, uri)) {// 如果是document类型的Uri则通过document id处理val docId DocumentsContract.getDocumentId(uri)if (com.android.providers.media.documents uri!!.authority) {val id docId.split(:.toRegex()).toTypedArray()[1] // 解析出数字格式的idval selection MediaStore.Images.Media._ID idimagePath getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection)} else if (com.android.providers.downloads.documents uri.authority) {val contentUri ContentUris.withAppendedId(Uri.parse(content://downloads/public_downloads), java.lang.Long.valueOf(docId))imagePath getImagePath(contentUri, null)}} else if (content.equals(uri!!.scheme, ignoreCase true)) {// 如果是content类型的Uri则使用普通方式处理imagePath getImagePath(uri, null)} else if (file.equals(uri.scheme, ignoreCase true)) {// 如果是file类型的Uri直接获取图片路径即可imagePath uri.path}displayImage(imagePath) // 根据图片路径显示图片}SuppressLint(Range)private fun getImagePath(uri: Uri?, selection: String?): String? {var path: String? null// 通过Uri和selection来获取真实的图片路径val 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 displayImage(imagePath: String?) {if (imagePath ! null) {val bitmap BitmapFactory.decodeFile(imagePath)binding.imageView.setImageBitmap(bitmap)} else {//Toast.makeText(this, failed to get image, Toast.LENGTH_SHORT).show()}}fun requestPermission() {when {ContextCompat.checkSelfPermission(this,Manifest.permission.READ_EXTERNAL_STORAGE) PackageManager.PERMISSION_GRANTED - {}ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.CAMERA) - {requestPermissionLauncher.launch(Manifest.permission.CAMERA)requestPermissionLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)requestPermissionLauncher.launch(Manifest.permission.WRITE_EXTERNAL_STORAGE)}else - {requestPermissionLauncher.launch(Manifest.permission.CAMERA)requestPermissionLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)requestPermissionLauncher.launch(Manifest.permission.WRITE_EXTERNAL_STORAGE)}}}fun View.showSnackbar(view: View,msg: String,length: Int,actionMessage: CharSequence?,action: (View) - Unit) {val snackbar Snackbar.make(view, msg, length)if (actionMessage ! null) {snackbar.setAction(actionMessage) {action(this)}.show()} else {snackbar.show()}}/*** A native method that is implemented by the facedetectordemo native library,* which is packaged with this application.*/external fun stringFromJNI(): Stringexternal fun getFaceInfoList(): ArrayFaceInfocompanion object {// Used to load the facedetectordemo library on application startup.init {System.loadLibrary(facedetectordemo)}}
}2. main_layout.xml
?xml version1.0 encodingutf-8?
androidx.constraintlayout.widget.ConstraintLayout xmlns:androidhttp://schemas.android.com/apk/res/androidxmlns:apphttp://schemas.android.com/apk/res-autoxmlns:toolshttp://schemas.android.com/toolsandroid:layout_widthmatch_parentandroid:layout_heightmatch_parenttools:context.MainActivityButtonandroid:idid/openGalleryandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:layout_marginBottom212dpandroid:text打开相册app:layout_constraintBottom_toBottomOfparentapp:layout_constraintEnd_toEndOfparentapp:layout_constraintHorizontal_bias0.498app:layout_constraintStart_toStartOfparentapp:layout_constraintTop_toBottomOfid/imageViewapp:layout_constraintVertical_bias1.0 /ImageViewandroid:idid/imageViewandroid:layout_width200dpandroid:layout_height200dpandroid:layout_marginTop96dpapp:layout_constraintEnd_toEndOfparentapp:layout_constraintStart_toStartOfparentapp:layout_constraintTop_toTopOfparenttools:srcCompattools:sample/avatars //androidx.constraintlayout.widget.ConstraintLayout
