導航了動作條COMPAT

Question

繼開發人員指南，設置應用程序圖標爲向上按鈕，我做完這些步驟來實現這一目標：

在活動：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.configuration); 

    /**Enable app icon as Up button on ActionBar*/ 
    ActionBar actionBar = getSupportActionBar(); 
    actionBar.setDisplayHomeAsUpEnabled(true); 

在清單：

<activity 
    android:name="com.example.Configuration" 
    android:label="@string/config_title"   
    android:parentActivityName="com.example.MainActivity" > 
     <!-- Parent activity meta-data to support API level 7+ --> 
     <meta-data 
      android:name="android.support.PARENT_ACTIVITY" 
      android:value="com.example.MainActivity" /> 
</activity> 

但還是不起作用。

Answer 1

您將在您的活動寫這篇文章：

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.config_screen); 
      actionBar.setDisplayHomeAsUpEnabled(false); 
    } 

@Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     try { 
      switch (item.getItemId()) { 

      case android.R.id.home: 
       finish(); 
       Intent in= new Intent(Configuration.this, 
         MainACtivity.class); 
       startActivity(in); 
       break; 
      } 
     } catch (Exception ex) { 
      Log.e("MainActivity - onOptionsItemSelected ", ex.getMessage()); 
      ex.printStackTrace(); 
     } 

     return super.onOptionsItemSelected(item); 
    }