我建议从ActionBarActivity致以Activity类

下面是previous code：

 进口android.support.v7.app.ActionBar;
进口android.support.v7.app.ActionBarActivity;

公共类MainActivity延伸活动{

@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;
}
 

我写了新的应用程序，并遵循建议。

 进口android.os.Bundle;
    进口android.support.v7.app.ActionBar;
    进口android.support.v7.app.ActionBarActivity;

    公共类MainActivity扩展ActionBarActivity {

          @覆盖
          公共无效的onCreate（包savedInstanceState）{
            super.onCreate（savedInstanceState）;
            动作条动作条= getSupportActionBar（）;
            actionBar.setDisplayHomeAsUpEnabled（真正的）;
            的setContentView（R.layout.activity_main）;
          }

          @覆盖
          公共布尔onCreateOptionsMenu（功能菜单）{
            。getMenuInflater（）膨胀（R.menu.main，菜单）;
            返回true;
          }
        }
 

如果我用，而不是活动ACtionBarActivity，我得到以下错误的电话，当我尝试运行它：

该方法getSupportActionBar（）是未定义的类型TaskActivity

下面是我的问题的答案。 我问过一遍了一些言论。 如何添加支持库？

I was recommended to extend my Activity class from ActionBarActivity

Here is the previous code:

import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;  

public class MainActivity extends Activity  {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);         
}

I wrote new application and followed advice.

import android.os.Bundle;
    import android.support.v7.app.ActionBar;
    import android.support.v7.app.ActionBarActivity;            

    public class MainActivity extends ActionBarActivity {

          @Override
          public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            ActionBar actionBar =getSupportActionBar();
            actionBar.setDisplayHomeAsUpEnabled(true);            
            setContentView(R.layout.activity_main);
          }

          @Override
          public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
          }            
        }

If I use ACtionBarActivity instead of Activity, I get the following error on the phone, when I try to run it:

The method getSupportActionBar() is undefined for the type TaskActivity

Here is the answer of my question. I've asked that again with some remarks. How to add support libraries?