在onCreate（）後調用requestWindowFeature（）

Question

如在幾個answers中所述，調用requestWindowFeature(Window.FEATURE_NO_TITLE)應該在super.onCreate(...)和setContentView(...)之前。
但是，我希望屏幕的標題在創建活動時出現，並且在從其他活動返回後僅消失。
我嘗試這樣做：

public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    switch (requestCode) { 
    case REQUEST_CONNECT_DEVICE: 
      requestWindowFeature(Window.FEATURE_NO_TITLE); 
    } 
} 

而且我得到了android.util.AndroidRuntimeException: requestFeature() must be called before adding content例外。

Answer 1

// try this way,hope this will help you.... 

Note : i think what you trying do is not possible so try this alternative. 
public class FirstActivity extends Activity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     if(!getIntent().getBooleanExtra("isTitleShow",true)){ 
      requestWindowFeature(Window.FEATURE_NO_TITLE); 
     } 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     // this condition for stop to call SecondActivity after one time call 
     if(getIntent().getBooleanExtra("isTitleShow",true)){ 
      Intent intent = new Intent(this,SecondActivity.class); 
      startActivity(intent); 
      finish(); 
     } 
    } 
} 


public class SecondActivity extends Activity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     Intent intent = new Intent(this,MainActivity.class); 
     intent.putExtra("isTitleShow",false); 
     startActivity(intent); 
    } 
}