class cannot be instantiated

01 - 12 01: 47: 22.910 1811 - 1811 / ? E / AndroidRuntime : FATAL EXCEPTION: main 
Process: com.android.locktest.lockscreen, PID: 1811 
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo { 
  com.android.locktest.lockscreen / com.screen.locktest.lockscreen.LockScreenActivity 
}: java.lang.InstantiationException: class com.screen.locktest.lockscreen.LockScreenActivity cannot be instantiated 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2209) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2360) 
at android.app.ActivityThread.access$800(ActivityThread.java: 144) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1278) 
at android.os.Handler.dispatchMessage(Handler.java: 102) 
at android.os.Looper.loop(Looper.java: 135) 
at android.app.ActivityThread.main(ActivityThread.java: 5221) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java: 372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 899) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 694) 
Caused by: java.lang.InstantiationException: class com.screen.locktest.lockscreen.LockScreenActivity cannot be instantiated 
at java.lang.Class.newInstance(Class.java: 1553) 
at android.app.Instrumentation.newActivity(Instrumentation.java: 1065) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2199) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2360)  
at android.app.ActivityThread.access$800(ActivityThread.java: 144)  
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1278)  
at android.os.Handler.dispatchMessage(Handler.java: 102)  
at android.os.Looper.loop(Looper.java: 135)  
at android.app.ActivityThread.main(ActivityThread.java: 5221)  
at java.lang.reflect.Method.invoke(Native Method)  
at java.lang.reflect.Method.invoke(Method.java: 372)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 899)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 694)  
01 - 12 01: 57: 49.896 2089 - 2089 / com.android.locktest.lockscreen E / AndroidRuntime: FATAL EXCEPTION: main 
Process: com.android.locktest.lockscreen, PID: 2089 
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo { 
  com.android.locktest.lockscreen / com.screen.locktest.lockscreen.LockScreenActivity 
}: java.lang.InstantiationException: class com.screen.locktest.lockscreen.LockScreenActivity cannot be instantiated 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2209) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2360) 
at android.app.ActivityThread.access$800(ActivityThread.java: 144) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1278) 
at android.os.Handler.dispatchMessage(Handler.java: 102) 
at android.os.Looper.loop(Looper.java: 135) 
at android.app.ActivityThread.main(ActivityThread.java: 5221) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java: 372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 899) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 694) 
Caused by: java.lang.InstantiationException: class com.screen.locktest.lockscreen.LockScreenActivity cannot be instantiated 
at java.lang.Class.newInstance(Class.java: 1553) 
at android.app.Instrumentation.newActivity(Instrumentation.java: 1065) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2199) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2360)  
at android.app.ActivityThread.access$800(ActivityThread.java: 144)  
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1278)  
at android.os.Handler.dispatchMessage(Handler.java: 102)  
at android.os.Looper.loop(Looper.java: 135)  
at android.app.ActivityThread.main(ActivityThread.java: 5221)  
at java.lang.reflect.Method.invoke(Native Method)  
at java.lang.reflect.Method.invoke(Method.java: 372)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 899)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 694)

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo { 
  com.android.locktest.lockscreen / com.screen.locktest.lockscreen.LockScreenActivity 
}: java.lang.InstantiationException: class com.screen.locktest.lockscreen.LockScreenActivity cannot be instantiated

<< ? 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.android.locktest.lockscreen" 
tools: ignore = "ExtraText" > 
 
  < 
  uses - permission android: name = "android.permission.DISABLE_KEYGUARD" / > 
  < 
  uses - permission android: name = "android.permission.WAKE_LOCK" / > 
  < 
  uses - permission android: name = "android.permission.RECEIVE_BOOT_COMPLETED" / > 
  < 
  uses - permission android: name = "android.permission.READ_PHONE_STATE" / > 
  < 
  uses - permission android: name = "android.permission.SYSTEM_ALERT_WINDOW" / > 
 
  < 
  application 
 
android: label = "@string/app_name" 
android: name = "android.support.multidex.MultiDexApplication" > 
 
  < 
  activity android: name = "com.screen.locktest.lockscreen.LockScreenActivity" 
android: excludeFromRecents = "true" 
android: label = "@string/app_name" 
android: launchMode = "singleTask" 
android: screenOrientation = "portrait" 
android: theme = "@android:style/Theme.NoTitleBar.Fullscreen" > 
  < 
  intent - filter > 
  < 
  action android: name = "android.intent.action.MAIN" / > 
  < 
  category android: name = "android.intent.category.LAUNCHER" / > 
  < 
  /intent-filter> < 
  /activity> < 
  service 
android: name = "com.screen.locktest.lockscreen.LockscreenService" / > 
 
 
  < 
  receiver android: name = "com.screen.locktest.lockscreen.LockscreenIntentReceiver" > 
 
 
 
  < 
  intent - filter > 
  < 
  action android: name = "android.intent.action.BOOT_COMPLETED" / > 
  < 
  /intent-filter> < 
  /receiver> < 
  /application> < 
  /manifest>

apply plugin: 'com.android.application' 
 
android { 
  aaptOptions.cruncherEnabled = false 
  aaptOptions.useNewCruncher = false 
  compileSdkVersion 27 
  buildToolsVersion '26.0.2' 
 
  defaultConfig { 
    multiDexEnabled true 
    minSdkVersion 19 
    targetSdkVersion 27 
 
  } 
  buildTypes { 
    release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
    } 
  } 
 
 
  compileOptions { 
    targetCompatibility 1.8 
    sourceCompatibility 1.8 
  } 
} 
 
dependencies { 
  implementation 'com.android.support:multidex:1.0.2' 
  implementation 'com.android.support:appcompat-v7:27.0.2' 
  implementation 'com.android.support.constraint:constraint-layout:1.0.2' 
  testImplementation 'junit:junit:4.12' 
  androidTestImplementation 'com.android.support.test:runner:1.0.1' 
  androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' 
}