NullPointerException: Attempt to invoke virtual method 'setPadding' on a null object reference

[iovxw]

Describe the bug 在一些特定情况下 com.osfans.trime.ime.core.Trime.loadBackground 会访问未初始化的变量，造成 trime 崩溃

To Reproduce Steps to reproduce the bug:

在 onCreateInputView 被调用之前调用 loadBackground，通过如下方法

1. 使 Trime 处于未初始化状态，有几种方式:
   • 在 Android 任务视图里划掉 Trime（这个具体的行为依赖 ROM 的实现，可能无法稳定复现）
   • 覆盖安装 trime
   • trime 崩溃后
   • 系统重启后
2. 需要注意的是，使用 App Info 里的强制结束无法达到等同效果
3. 在这之后不要点击任何输入栏
4. 打开 Trime，进入 Appearance，点击 Themes 或者 Colors
5. 随便选一个，或者不选，点 OK
6. 崩溃

Expected behavior A clear and concise description of what you expected to happen.

Log

java.lang.NullPointerException: Attempt to invoke virtual method 'void com.osfans.trime.ime.keyboard.KeyboardView.setPadding(int, int, int, int)' on a null object reference
 at com.osfans.trime.ime.core.Trime.loadBackground(Trime.java:490)
 at com.osfans.trime.ime.core.Trime.initKeyboard(Trime.java:560)
 at com.osfans.trime.settings.components.ColorPickerDialog.selectColor(ColorPickerDialog.kt:46)
 at com.osfans.trime.settings.components.ColorPickerDialog.lambda-2$lambda-0(ColorPickerDialog.kt:34)
 at com.osfans.trime.settings.components.ColorPickerDialog.$r8$lambda$8oSxrFMJJx1x-pXTOGn1ZF_kUvU(Unknown Source:0)
 at com.osfans.trime.settings.components.ColorPickerDialog$$ExternalSyntheticLambda0.onClick(Unknown Source:2)
 at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:174)
 at android.os.Handler.dispatchMessage(Handler.java:106)
 at android.os.Looper.loop(Looper.java:223)
 at android.app.ActivityThread.main(ActivityThread.java:7664)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

Screenshots If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• OS: Android 11
• Version: cd19c26c710acde288395e89205d3a32b43e12e3

Additional context Add any other context about the problem here.

[Bambooin]

close by #544