Getting “null object reference” error while trying to send an int with Intent

Question

Code on sender Activity

Intent intent = new Intent(this, ScrollingActivity.class);
    intent.putExtra("KEY", 1);
    startActivity(intent);

Code on receiver Activity

int a = getIntent().getExtras().getInt("KEY");

While trying this getting this error log

java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference

Can you help for fix it?

Answer 1

您的错误表明getIntent返回的是null引用，您应该检查在调用getIntent的位置-应该在Activity生命周期的Actvity.onCreate内部或之后调用它。