Exception details are logged in Window & gt; Show View & gt; Error Log, exceptionlogged

Exception details are logged in Window> Show View> Error Log, exceptionlogged

Exercise layout today. After EditText is used, the screen is dimmed and an error is reported:

Exception raised during rendering: java. lang. System. arraycopy ([CI [CII) V
Exception details are logged in Window> Show View> Error Log

I have been checking my code (newbie) and found that my code is no different from the code in the tutorial, and it is normal to use controls such as TextView;

After searching (baidu), the problem was solved.

...

I'm not sure...

JavalangNegativeArraySizeException Exception details are logged in Window> Show View> Error Log

If you use a negative value to create an array, an exception occurs when the array size is negative.

Android: After the icon is changed, the system prompts javalangNullPointerException ......

Null Pointer. An object in your class is not instantiated.