Flutter-应用程序只能在模拟器上运行，而不能在设备上运行(使用http包) [英] Flutter- App working on emulator but not on device (uses http package)
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问题描述
我的应用程序在仿真器Nexus 5(API 28)上运行良好，但是当我构建apk在真实设备上尝试使用它时，登录按钮什么也没做.
My application works fine on emulator Nexus 5 (API 28) but when i build an apk to try it on real device it doesn't, The login button does nothing at all.
我已经从应用程序中删除了所有功能，现在它只是通过http包登录，它使用了一个与Mysql数据库进行通信并以Json格式返回值的php文件.
I've removed all features from the app, now it just logs in through http package, it uses a php file that communicates with the Mysql database and return values in Json format.
该应用程序登录用户并将其发送到另一个显示成功"的屏幕
The app logs in user and send him to another screen that says "Success"
UI部分:
child: Material(
color: Colors.transparent,
child: InkWell(
onTap: () {
Services.logIn(_usernameController.text.trim(),
_passwordController.text.trim(), context);
},
Services.logIn:
Services.logIn :
static Future<bool> logIn(
String username, String password, BuildContext context) async {
var map = Map<String, dynamic>();
map['action'] = _LOGIN;
map['username'] = username;
map['password'] = password;
final response = await http.post(ROOT, body: map);
if (response.body.isNotEmpty) {
Navigator.push(
context, MaterialPageRoute(builder: (context) => LoginSuccesed()));
return true;
} else {
return false;
}
}
AndroidManifest:
AndroidManifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="manshore.apk_testing">
<!-- io.flutter.app.FlutterApplication is an android.app.Application that
calls FlutterMain.startInitialization(this); in its onCreate method.
In most cases you can leave this as-is, but you if you want to provide
additional functionality it is fine to subclass or reimplement
FlutterApplication and put your custom class here. -->
<application
android:name="io.flutter.app.FlutterApplication"
android:label="apk_testing"
android:icon="@mipmap/ic_launcher">
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- Don't delete the meta-data below.
This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
<meta-data
android:name="flutterEmbedding"
android:value="2" />
</application>
</manifest>
Android> App> build.gradle (它显示属性"上的错误，并且"GradleException"无法解析符号)
Android > App > build.gradle (it shows error on 'Properties' and 'GradleException' cannot resolve symbole)
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: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
android {
compileSdkVersion 28
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
multiDexEnabled true
applicationId "manshore.apk_testing"
minSdkVersion 16
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
// TODO: Add your own signing config for the release build.
// Signing with the debug keys for now, so `flutter run --release` works.
signingConfig signingConfigs.debug
}
}
}
flutter {
source '../..'
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}
完整的用户界面:
import 'package:flutter/material.dart';
import 'Services.dart';
void main() => runApp(MaterialApp(home: LoginUI()));
class LoginUI extends StatefulWidget {
@override
_LoginUIState createState() => new _LoginUIState();
}
class _LoginUIState extends State<LoginUI> {
final _usernameController = TextEditingController();
final _passwordController = TextEditingController();
Widget build(BuildContext context) {
return MaterialApp(
home: new Scaffold(
backgroundColor: Colors.white,
resizeToAvoidBottomPadding: true,
body: Stack(
children: <Widget>[
SingleChildScrollView(
child: Column(
children: <Widget>[
Container(
width: double.infinity,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
SizedBox(height: 50),
TextField(
controller: _usernameController,
decoration: InputDecoration(
hintText: "username",
hintStyle: TextStyle(
color: Colors.grey, fontSize: 12.0)),
),
SizedBox(),
TextField(
controller: _passwordController,
obscureText: true,
decoration: InputDecoration(
hintText: "Password",
hintStyle: TextStyle(
color: Colors.grey, fontSize: 12.0)),
),
SizedBox(),
],
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
InkWell(
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(colors: [
Color(0xFF17ead9),
Color(0xFF6078ea)
]),
borderRadius: BorderRadius.circular(6.0),
boxShadow: [
BoxShadow(
color: Color(0xFF6078ea).withOpacity(.3),
offset: Offset(0.0, 8.0),
blurRadius: 8.0)
]),
child: Material(
color: Colors.transparent,
child: InkWell(
onTap: () {
Services.logIn(_usernameController.text.trim(),
_passwordController.text.trim(), context);
},
child: Center(
child: Text("SIGNIN",
style: TextStyle(
color: Colors.white,
fontFamily: "Poppins-Bold",
fontSize: 18,
letterSpacing: 1.0)),
),
),
),
),
),
],
),
SizedBox(),
],
),
)
],
),
),
);
}
}
推荐答案
您需要在 AndroidManifest.xml 文件中获得互联网许可.添加以下行:
You need internet permission in your AndroidManifest.xml file. Add following line:
<uses-permission android:name="android.permission.INTERNET"/>
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