android-studio

Android Studio – what is the replacement for onclick ( depecrated ) in kotlin?

I want use android:onClick to access the functions at MainActivity from activity_main.xml but it's deprecated. Is there another way or replacement for onClick? Here the code: <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:orientation="horizontal"> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:textSize="30dp" android:id="@+id/btn00" android:onClick="click"></Button></LinearLayout> and my…

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Android Studio – Delegate runner androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner for AndroidJUnit4 could not be found

I've written the code to test the SQL commands. But when I right-clicked my class(such as testInsert() ), the "Run" reported the error: "java.lang.RuntimeException: Delegate runner androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner for AndroidJUnit4 could not be found.". The version of AS is 4.2.2. After…

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Duplicate class com.mapbox.android.telemetry.AlarmReceiver found in modules. Mapbox Android studio

I am studying the examples in mapbox in android studio but when I run the code it shows FAILURE: Build failed with an exception. Execution failed for task ':app:checkDebugDuplicateClasses'. A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable Duplicate class com.mapbox.android.telemetry.AlarmReceiver found in…

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Android Studio – at com.future.vpn.Activities.MainActivity.onStart(MainActivity.java:186)

2021-08-14 19:43:53.129 8682-8682/com.future.vpn E/AndroidRuntime: FATAL EXCEPTION: main Process: com.future.vpn, PID: 8682 java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference at com.future.vpn.Activities.MainActivity.onStart(MainActivity.java:186) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1435) at android.app.Activity.performStart(Activity.java:8024) at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3475) at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221) at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201) at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)…

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