[英]Android Studio emulator starts, but flashes white screen and crashes the app
As the title suggests, when I start up the emulator, it starts up totally fine, but then immediately shows a white screen, followed by the home screen.正如标题所暗示的,当我启动模拟器时,它启动完全正常,但随后立即显示白屏,然后是主屏幕。 No app appears to have been installed.
似乎没有安装任何应用程序。 A few things to note:
需要注意的几点:
Thank you in advance for your help.预先感谢您的帮助。
AndroidManifest.xml AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.groupupandroid">
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.GroupUpAndroid"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.kt MainActivity.kt
package com.example.groupupandroid
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import com.example.groupupandroid.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
binding.registerButton.setOnClickListener {
binding.registerFields.visibility = View.VISIBLE
binding.loginFields.visibility = View.GONE
}
binding.loginButton.setOnClickListener {
binding.registerFields.visibility = View.GONE
binding.loginFields.visibility = View.VISIBLE
}
}
}
Animation of what is going on.正在发生的事情的动画。
If you take a look at your mainActivity.kt code, you will know that this is not an emulator problem ;)如果你看看你的 mainActivity.kt 代码,你就会知道这不是模拟器问题;)
here you are declaring a lateinit variable of type 'ActivityMainBinding' It is not initialized anywhere later in any way!在这里,您声明了一个 'ActivityMainBinding' 类型的 lateinit 变量它不会以任何方式在以后的任何地方初始化!
private lateinit var binding: ActivityMainBinding
you will definitevely find a solution here and I encourage you to read more about viewBinding :)您肯定会在这里找到解决方案,我鼓励您阅读有关 viewBinding 的更多信息 :)
but if you do not want to do that:但如果你不想这样做:
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// as you can see here it is initalized
binding = ActivityMainBinding.inflate(layoutInflater)
val view = binding.root
// and because it is initalized, you can now reference it without the app crashing
binding.registerButton.setOnClickListener {
binding.registerFields.visibility = View.VISIBLE
binding.loginFields.visibility = View.GONE
}
setContentView(view)
}
edit / tip: The app crash will not always generate the Java stack trace, but if you run the app for another 3-5 times or run it in the debug mode it probably will generate it at some point.编辑/提示:应用程序崩溃并不总是会生成 Java 堆栈跟踪,但如果您再运行应用程序 3-5 次或在调试模式下运行它,它可能会在某个时候生成它。 (worked for me so far)
(到目前为止为我工作)
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