Fixed: Fix NullPointerException when running bell/vibrate on Samsung …

…devices on android 8 and handled deprecated code

Apparently occurs on only Samsung android 8 devices and there is no fix for vibrator except catching the exception so that app doesn't crash.

https://gitlab.com/juanitobananas/wave-up/-/issues/131
overbound/SonicTimeTwisted#131
https://web.archive.org/web/20201114040257/https://www.badlogicgames.com/forum/viewtopic.php?t=28507

```
java.lang.NullPointerException: Attempt to read from field 'android.os.VibrationEffect com.android.server.VibratorService$Vibration.mEffect' on a null object reference
at android.os.Parcel.readException(Parcel.java:2035)
at android.os.Parcel.readException(Parcel.java:1975)
at android.os.IVibratorService$Stub$Proxy.vibrate(IVibratorService.java:292)
at android.os.SystemVibrator.vibrate(SystemVibrator.java:81)
at android.os.Vibrator.vibrate(Vibrator.java:191)
at android.os.Vibrator.vibrate(Vibrator.java:110)
at android.os.Vibrator.vibrate(Vibrator.java:89)
at com.termux.app.terminal.io.BellHandler$1.run(BellHandler.java:37)
at com.termux.app.terminal.io.BellHandler.doBell(BellHandler.java:55)
at com.termux.app.terminal.TermuxTerminalSessionClient.onBell(TermuxTerminalSessionClient.java:178)
at com.termux.terminal.TerminalSession.onBell(TerminalSession.java:278)
```

app/src/main/java/com/termux/app/terminal/io/BellHandler.java

@@ -1,15 +1,21 @@
 package com.termux.app.terminal.io;
 
 import android.content.Context;
+import android.os.Build;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.SystemClock;
+import android.os.VibrationEffect;
 import android.os.Vibrator;
 
+import com.termux.shared.logger.Logger;
+
 public class BellHandler {
     private static BellHandler instance = null;
     private static final Object lock = new Object();
 
+    private static final String LOG_TAG = "BellHandler";
+
     public static BellHandler getInstance(Context context) {
         if (instance == null) {
             synchronized (lock) {
@@ -34,7 +40,17 @@ private BellHandler(final Vibrator vibrator) {
             @Override
             public void run() {
                 if (vibrator != null) {
-                    vibrator.vibrate(DURATION);
+                    try {
+                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                            vibrator.vibrate(VibrationEffect.createOneShot(DURATION, VibrationEffect.DEFAULT_AMPLITUDE));
+                        } else {
+                            vibrator.vibrate(DURATION);
+                        }
+                    } catch (Exception e) {
+                        // Issue on samsung devices on android 8
+                        // java.lang.NullPointerException: Attempt to read from field 'android.os.VibrationEffect com.android.server.VibratorService$Vibration.mEffect' on a null object reference
+                        Logger.logStackTraceWithMessage(LOG_TAG, "Failed to run vibrator", e);
+                    }
                 }
             }
         };