onCreate in new Activity can not display

Question

我在MainActivity中打开一个NewActivity。它可以运行得非常好。但是NewActivity没有布局。它只是显示白色。我不知道为什么。

我在R.layout.activity_first中编写布局。

MainActivity.java

package com.example.hello_2; 

import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Button button=(Button)this.findViewById(R.id.button1); 
     button.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Intent intent=new Intent(MainActivity.this,NewActivity.class); 
       startActivity(intent); 
      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 

} 

NewActivity.java

package com.example.hello_2; 

import com.example.hello_2.NewActivity; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.SubMenu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 

public class NewActivity extends Activity{ 
    protected void onCreat(Bundle savedInstanceState1){ 
     super.onCreate(savedInstanceState1); 
     setContentView(R.layout.activity_first); 
     Log.d("NewActivity", "onCreat"); 
     } 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     return super.onCreateOptionsMenu(menu); 
    } 

} 

Answer 1

你拼错onCreate()为onCreat()

@Override 
protected void onCreate(Bundle savedInstanceState1){ 
     super.onCreate(savedInstanceState1); 
     setContentView(R.layout.activity_first); 
     Log.d("NewActivity", "onCreat"); 
     } 

添加e。考虑使用@Override注释，它为极大地helps这些事情。