android 闪退错误,刚学andriod，自己做的APP闪退了但是没报错，大佬能帮忙看下部...

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package com.example.administrator.a3_01test;

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.ImageButton;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

//private TextView textView;

private EditText editText;

private Button normalButton;

private ImageButton imageButton;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//textView=(TextView)findViewById(R.id.aid);

//textView.setText("Change in World");

//String str=textView.getText().toString();

/*editText=(EditText)findViewById(R.id.edit);

editText.setText("Change");

String strEditText=editText.getText().toString();*/

super.onCreate(savedInstanceState);

normalButton=(Button)findViewById(R.id.button);

imageButton=(ImageButton)findViewById(R.id.imagebutton);

editText=(EditText)findViewById(R.id.edit);

normalButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

editText.setText("普通按钮");

}

});

imageButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

editText.setText("图片按钮");

}

});

}

}