setclicklistener出现java.lang.nullpointerexception错误怎么解决啊
Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
mEmailSignInButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent intent =new Intent(LoginActivity.this,Main2Activity.class);
startActivity(intent);
}
});
在setOnclickListener处出现警告,警告内容是Method invocation 'setOnClickListener' may produce 'java.lang.nullpointerexception'
这怎么解决呢,谢谢