Android Studio表示"Expression expected"

Question

Android Studio告诉 Java 文件中存在错误，字符串summonButton2();Android Studio 显示"预期表达式"。

我希望该方法summonButton2自动启动。我承认我做错了。除了将其添加到方法之外，究竟还有什么方法可以启动方法onCreate方法？提前谢谢。

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
int numberOfLinesLeft = 3;
Button secondaryActivityAddButton;
LinearLayout llForSecondaryButton;
LinearLayout llForSecondaryEditText;
EditText et;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
summonButton2();
}
public void summonButton2(View view){
llForSecondaryButton = findViewById(R.id.secondaryButton);
secondaryActivityAddButton = new Button(this);
secondaryActivityAddButton.setText("" + numberOfLinesLeft);
llForSecondaryButton.addView(secondaryActivityAddButton);
secondaryActivityAddButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
plusTextField();
if(numberOfLinesLeft == 0) {
view.setVisibility(View.GONE);
}
}
});
}
public void plusTextField() {
llForSecondaryEditText = findViewById(R.id.linearLayout1);
// add edittext
et = new EditText(this);
et.setText("text" + numberOfLinesLeft       );
llForSecondaryEditText.addView(et);
numberOfLinesLeft--;
secondaryActivityAddButton.setText("" + numberOfLinesLeft);
}
}

Answer 1

summonButton2(new View(this));

对我的情况有所帮助。