I followed Android's Build your first app guide. Next, I'm trying to add a launcher splash screen by following a number of tutorials (this being one of them). When I run the app in the emulator it loads so fast that I can't tell if the splash screen works. Is there a way to temporarily slow down the emulator to check the splash screen? Also the app crashes when the Send button is clicked which doesn't make sense because the sendMessage function exists in the MainActivity.
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myfirstapp, PID: 9242
java.lang.IllegalStateException: Could not find method sendMessage(View) in a parent or ancestor Context for android:onClick attribute defined on view class androidx.appcompat.widget.AppCompatButton with id 'button'
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:436)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:393)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
I'm honestly not sure what is wrong or if the app is just so small that a splash screen won't show. I'm also not sure the best way to share my project here. So below is all of the code.
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".SplashActivity"
android:theme="@style/SplashTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".DisplayMessageActivity"
android:parentActivityName=".MainActivity">
<!-- For API 15 -->
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".MainActivity" />
</activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.kt
package com.example.myfirstapp
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.EditText
const val EXTRA_MESSAGE = "come.example.myfirstapp.MESSAGE"
class MainActivity : AppCompatActivity()
{
override fun onCreate(savedInstanceState: Bundle?)
{
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
//Called when user taps Send button
fun sendMessage(view: View)
{
val editText = findViewById<EditText>(R.id.editTextTextPersonName)
val message = editText.text.toString()
val intent = Intent(this, DisplayMessageActivity::class.java).apply {putExtra(EXTRA_MESSAGE, message)}
startActivity(intent)
}
}
DisplayMessageActivity
package com.example.myfirstapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
class DisplayMessageActivity : AppCompatActivity()
{
override fun onCreate(savedInstanceState: Bundle?)
{
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_display_message)
//Get the Intent that started this activity and extract the string
val message = intent.getStringExtra(EXTRA_MESSAGE)
//Capture the layout's TextView and set the string as its text
val text = findViewById<TextView>(R.id.textView).apply {text = message}
}
}
SplashActivity
package com.example.myfirstapp
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
class SplashActivity : AppCompatActivity()
{
override fun onCreate(savedIntanceState: Bundle?)
{
setTheme(R.style.AppTheme)
super.onCreate(savedIntanceState)
setContentView(R.layout.activity_main)
}
}
drawable splash_background.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
android:opacity="opaque">
<item android:drawable="@color/colorPrimary" />
<item>
<bitmap android:gravity="center" android:src="@mipmap/ic_launcher" />
</item>
</layer-list>
values styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<!-- Splash Screen theme. -->
<style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
<item name="android:windowBackground">@drawable/splash_background</item>
</style>
</resources>
Edit - updated error after help from S T
