java.lang.ClassCastException: android.view.ContextThemeWrapper cannot be cast to android.app.Activity

[lucas-ferreira-machado]

I received this error in my project:

2019-07-17 16:45:52.667 14358-14358/com.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.app, PID: 14358
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app/com.app.MainActivity}: android.view.InflateException: Binary XML file line #52: Binary XML file line #52: Error inflating class com.evolve.backdroplibrary.BackdropContainer
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3121)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3260)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1976)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6912)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:860)
Caused by: android.view.InflateException: Binary XML file line #52: Binary XML file line #52: Error inflating class com.evolve.backdroplibrary.BackdropContainer
Caused by: android.view.InflateException: Binary XML file line #52: Error inflating class com.evolve.backdroplibrary.BackdropContainer
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.app.MainActivity.onCreate(MainActivity.kt:42)
at android.app.Activity.performCreate(Activity.java:7144)
at android.app.Activity.performCreate(Activity.java:7135)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1293)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3101)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3260)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1976)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6912)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:860)
Caused by: java.lang.ClassCastException: android.view.ContextThemeWrapper cannot be cast to android.app.Activity
at com.evolve.backdroplibrary.BackdropContainer.(BackdropContainer.java:45)
at java.lang.reflect.Constructor.newInstance0(Native Method) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:343) 
at android.view.LayoutInflater.createView(LayoutInflater.java:647) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469) 
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
at com.app.MainActivity.onCreate(MainActivity.kt:42) 
at android.app.Activity.performCreate(Activity.java:7144) 
at android.app.Activity.performCreate(Activity.java:7135) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1293) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3101) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3260) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1976) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:6912) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:860) 

My configuration project:

compileSdkVersion 29
defaultConfig {
applicationId "com.app"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}

implementation 'com.github.kishan2612:Material-Backdrop-Android:v1.1.0'

[lucas-ferreira-machado]

The CastException happens in the instruction ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metrics);

public BackdropContainer(@nonnull Context context, @nullable AttributeSet attrs) {
super(context, attrs);

    this.context=context;

    TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.BackdropContainer,0,0);

    mMenuicon=typedArray.getDrawable(R.styleable.BackdropContainer_menuIcon);
    mCloseicon=typedArray.getDrawable(R.styleable.BackdropContainer_closeIcon);
    duration=typedArray.getInt(R.styleable.BackdropContainer_duration,1000);

    typedArray.recycle();

    DisplayMetrics metrics=new DisplayMetrics();

       ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metrics); 

    height=metrics.heightPixels;


}

To fix the error, please change that instruction. Please use this line in constructor of BackdropContainer class:

 **getActivityFromContext(context).getWindowManager().getDefaultDisplay().getMetrics(metrics);**

Add the method below in BackdropContainer class:

 **private Activity getActivityFromContext(Context context) {
     if (context == null)
         return null;
     else if (context instanceof Activity)
         return (Activity)context;
     else if (context instanceof ContextWrapper)
         return getActivityFromContext(((ContextWrapper)context).getBaseContext());
     return null;
 }**

The constructor of the BackdropContainer class would look like this:

**public BackdropContainer(@nonnull Context context, @nullable AttributeSet attrs) {
super(context, attrs);

    this.context=context;

    TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.BackdropContainer,0,0);

    mMenuicon=typedArray.getDrawable(R.styleable.BackdropContainer_menuIcon);
    mCloseicon=typedArray.getDrawable(R.styleable.BackdropContainer_closeIcon);
    duration=typedArray.getInt(R.styleable.BackdropContainer_duration,1000);

    typedArray.recycle();

    DisplayMetrics metrics=new DisplayMetrics();

    getActivityFromContext(context).getWindowManager().getDefaultDisplay().getMetrics(metrics);
    height=metrics.heightPixels;

}**

Please feel free to contact me if you have any doubts.

[FANMixco]

The CastException happens in the instruction ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metrics);

public BackdropContainer(@nonnull Context context, @nullable AttributeSet attrs) {
super(context, attrs);

    this.context=context;

    TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.BackdropContainer,0,0);

    mMenuicon=typedArray.getDrawable(R.styleable.BackdropContainer_menuIcon);
    mCloseicon=typedArray.getDrawable(R.styleable.BackdropContainer_closeIcon);
    duration=typedArray.getInt(R.styleable.BackdropContainer_duration,1000);

    typedArray.recycle();

    DisplayMetrics metrics=new DisplayMetrics();

       ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metrics); 

    height=metrics.heightPixels;


}

To fix the error, please change that instruction. Please use this line in constructor of BackdropContainer class:

 **getActivityFromContext(context).getWindowManager().getDefaultDisplay().getMetrics(metrics);**

Add the method below in BackdropContainer class:

 **private Activity getActivityFromContext(Context context) {
     if (context == null)
         return null;
     else if (context instanceof Activity)
         return (Activity)context;
     else if (context instanceof ContextWrapper)
         return getActivityFromContext(((ContextWrapper)context).getBaseContext());
     return null;
 }**

The constructor of the BackdropContainer class would look like this:

**public BackdropContainer(@nonnull Context context, @nullable AttributeSet attrs) {
super(context, attrs);

    this.context=context;

    TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.BackdropContainer,0,0);

    mMenuicon=typedArray.getDrawable(R.styleable.BackdropContainer_menuIcon);
    mCloseicon=typedArray.getDrawable(R.styleable.BackdropContainer_closeIcon);
    duration=typedArray.getInt(R.styleable.BackdropContainer_duration,1000);

    typedArray.recycle();

    DisplayMetrics metrics=new DisplayMetrics();

    getActivityFromContext(context).getWindowManager().getDefaultDisplay().getMetrics(metrics);
    height=metrics.heightPixels;

}**

Please feel free to contact me if you have any doubts.
backdroplibrary

What about if you do a fork and a pull request? It will be faster.