2020-4-25 编译 flutter 录音im 安卓版遇到的问题及解决方法

编译时出现： package android.support.v4.app does not exist 错误， cannot find symbol ContextCompat

是因为android studio 新版本， in my case is : 3.5.2

把 support.v4 这个package 集合到 Androidx ，

而

import 'package:fluttertoast/fluttertoast.dart';

1	import 'package:fluttertoast/fluttertoast.dart';

用到了

解决方法是：不再引用 fluttertoast 插件

或者也可以用旧版小于android 23 的sdk ，但不知如何换用旧版

编译错误： android firebase Cannot fit requested classes in a single dex file

是因为当引用 firebase 时，因为google firebase 所定义的method太多，所以需要app 支持 multidex

解决方法是：在app级 build.gradle 文件dependencies 加上：

implementation 'com.android.support:multidex:1.0.3'

1	implementation 'com.android.support:multidex:1.0.3'

defaultConfig 加上：

multiDexEnabled true

1	multiDexEnabled true

完整文件如下：

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 28

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.newvoicechat"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
    implementation 'com.android.support:multidex:1.0.3'
}

def localProperties = new Properties()

def localPropertiesFile = rootProject.file('local.properties')

if (localPropertiesFile.exists()) {

localPropertiesFile.withReader('UTF-8') { reader ->

localProperties.load(reader)

}

def flutterRoot = localProperties.getProperty('flutter.sdk')

if (flutterRoot == null) {

throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")

}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')

if (flutterVersionCode == null) {

flutterVersionCode = '1'

}

def flutterVersionName = localProperties.getProperty('flutter.versionName')

if (flutterVersionName == null) {

flutterVersionName = '1.0'

}

apply plugin: 'com.android.application'

apply plugin: 'com.google.gms.google-services'

apply plugin: 'kotlin-android'

apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {

compileSdkVersion 28

sourceSets {

main.java.srcDirs += 'src/main/kotlin'

}

lintOptions {

disable 'InvalidPackage'

}

defaultConfig {

// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).

applicationId "com.example.newvoicechat"

minSdkVersion 16

targetSdkVersion 28

versionCode flutterVersionCode.toInteger()

versionName flutterVersionName

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

multiDexEnabled true

}

buildTypes {

release {

// TODO: Add your own signing config for the release build.

// Signing with the debug keys for now, so `flutter run --release` works.

signingConfig signingConfigs.debug

}

flutter {

source '../..'

}

dependencies {

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

testImplementation 'junit:junit:4.12'

androidTestImplementation 'androidx.test:runner:1.1.1'

androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

implementation 'com.android.support:multidex:1.0.3'

}

解决方法来自： https://stackoverflow.com/questions/48249633/errorcannot-fit-requested-classes-in-a-single-dex-file-try-supplying-a-main-dex

如何请求 microphone 和读写权限

manifes 文件加：

    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

<uses-permission android:name="android.permission.RECORD_AUDIO" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>