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网站页面设计与制作实践,中俄最新军事新闻,淮安 网站建设,徐州网站建设魔站闲来无事#xff0c;flutter好久没看了#xff0c;上次折腾flutter与Android通信没折腾完#xff0c;有些事情耽搁了#xff0c;这次继续 演示效果#xff1a; flutter与Android原生通信 flutter端 import package:flutter/cupertino.dart; import package:flutter/mater… 闲来无事flutter好久没看了上次折腾flutter与Android通信没折腾完有些事情耽搁了这次继续 演示效果 flutter与Android原生通信 flutter端 import package:flutter/cupertino.dart; import package:flutter/material.dart; import package:flutter/services.dart; class LikePages extends StatefulWidget {const LikePages({super.key});overrideStateLikePages createState() _LikePagesState(); }class _LikePagesState extends StateLikePages {final MethodChannel _channel MethodChannel(abc); // Flutter 调用 Android 方法Futurevoid callNativeMethod() async {try {final String result await _channel.invokeMethod(getPlatformVersion);print(Result from Android: \(result);} catch (e) {print(Error calling native method: \)e);}}Futurevoid callNativeOpenCameraMethod() async {try {final String result await _channel.invokeMethod(openCamera);print(Result from Android: \(result);} catch (e) {print(Error calling native method: \)e);}}overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text(like),),body: Column(children: [Center(child: GestureDetector(child: Text(like),onTap: (){// 调用 Flutter 调用 Android 方法callNativeMethod();},),),Padding(padding: const EdgeInsets.all(80.0),child: Center(child: GestureDetector(child: Text(openCamare),onTap: (){// 调用 Flutter 调用 Android 方法callNativeOpenCameraMethod();},),),),],),);} } Android端 package com.example.f4import android.content.Context import android.content.ContextWrapper import android.content.Intent import android.graphics.Bitmap import android.net.Uri import android.os.Build.VERSION import android.os.Bundle import android.provider.MediaStore import android.util.Log import android.widget.Toast import androidx.annotation.NonNull import androidx.annotation.Nullable import com.hjq.permissions.OnPermissionCallback import com.hjq.permissions.Permission import com.hjq.permissions.XXPermissions import io.flutter.embedding.android.FlutterActivity import io.flutter.embedding.engine.FlutterEngine import io.flutter.plugin.common.MethodChannel import java.io.File import java.io.FileOutputStream import java.io.IOException import java.util.*class MainActivity: FlutterActivity() {private val CHANNEL abcprivate val REQUEST_IMAGE_CAPTURE 1private val PERMISSION_REQUEST_CODE 200var resultOut:MethodChannel.Result?nulloverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)XXPermissions.with(this) // 申请单个权限.permission(Permission.CAMERA) // 申请多个权限.permission(Permission.Group.CALENDAR) // 设置权限请求拦截器局部设置//.interceptor(new PermissionInterceptor())// 设置不触发错误检测机制局部设置//.unchecked().request(object : OnPermissionCallback {override fun onGranted(permissions: ListString, allGranted: Boolean) {if (!allGranted) { // Toast(thisMainActivity,获取部分权限成功但部分权限未正常授予,Toast.LENGTH_SHORT).show()return} // toast(获取录音和日历权限成功)}override fun onDenied(permissions: ListString, doNotAskAgain: Boolean) {if (doNotAskAgain) { // toast(被永久拒绝授权请手动授予录音和日历权限)// 如果是被永久拒绝就跳转到应用权限系统设置页面XXPermissions.startPermissionActivity(context, permissions)} else { // toast(获取录音和日历权限失败)}}})}override fun configureFlutterEngine(NonNull flutterEngine: FlutterEngine) {super.configureFlutterEngine(flutterEngine)// 创建 MethodChannelMethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler { call, result -// 处理 Flutter 调用 Android 方法if (call.method getPlatformVersion) {result.success(Android \({VERSION.RELEASE})}else if (call.methodopenCamera){Log.e(TAG,call.method:call.method);resultOut resultdispatchTakePictureIntent()} else {result.notImplemented()}}}// 获取真实路径的函数private fun getRealPathFromUri(uri: Uri): String? {val projection arrayOf(MediaStore.Images.Media.DATA)val cursor contentResolver.query(uri, projection, null, null, null)return cursor?.use {val columnIndex it.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)it.moveToFirst()it.getString(columnIndex)}}fun saveBitmapToFile(context: Context, bitmap: Bitmap): String {val cw ContextWrapper(context)val directory: File cw.getDir(images, Context.MODE_PRIVATE)// 为文件生成唯一的名称val imageName img_\){UUID.randomUUID()}.jpg// 创建文件对象val file File(directory, imageName)var fos: FileOutputStream? nulltry {fos FileOutputStream(file)bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos) // 将 Bitmap 压缩为 JPEG 格式} catch (e: IOException) {e.printStackTrace()} finally {try {fos?.close()} catch (e: IOException) {e.printStackTrace()}}// 返回文件的路径return file.absolutePath}override fun onActivityResult(requestCode: Int, resultCode: Int,data: Intent) {super.onActivityResult(requestCode, resultCode, data)Log.e(TAG,–\({data.extras} resultCode:\)resultCode requestCode:$requestCode )if (requestCode REQUEST_IMAGE_CAPTURE resultCode RESULT_OK) {// 图片从相机返回val extras data.extrasif (extras ! null) {// 获取拍摄的照片val imageBitmap extras.get(data) as Bitmap?// 保存 Bitmap 到文件并获取文件路径val imagePath imageBitmap?.let { saveBitmapToFile(applicationContext, it) }// 在这里使用文件路径resultOut?.success(imagePath)}} else {Toast.makeText(this, Failed to capture image, Toast.LENGTH_SHORT).show()}}private fun dispatchTakePictureIntent() {val takePictureIntent Intent(MediaStore.ACTION_IMAGE_CAPTURE)if (takePictureIntent.resolveActivity(packageManager) ! null) {startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE)}} } 上述代码演示了直接获取Android版本号以及调用Android原生拍照并发挥图片路径到Flutter的方式至于为什么会想要搞搞这个原因还是在与Flutter插件的稳定性问题假如要实现一个功能但是受限于Flutter插件自身的问题就只能自己来实现了这时候通过原生代码返回需要的数据就不失为一种解决方案