如何删除标题栏和LinearLayout的第一个元素之间的黑色空格？

Question

我有一个linearlayout，第一个元素是imageview标题，第二个元素是gridview。

它工作正常，但我在android tittle bar和app的标题之间有一个50px（或多或少）的错误黑色空间，这是linearlayout的第一个元素

为什么我有这个空间？我找到删除它的唯一方法是将此行：ll.setPadding(0, -50, 0, 0);

这是完整的代码：

public class MainGrid extends Activity {
    private GridView myGridView;
    private ImageAdapter myImageAdapter;
    private ImageView header;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);//turn off the window's title bar
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//fullscreen
    LinearLayout ll = new LinearLayout(this);
    ll.setOrientation(LinearLayout.VERTICAL);
    ll.setGravity(Gravity.CENTER);
    //ll.setPadding(0, -50, 0, 0);
    header = new ImageView(getApplicationContext());
    header.setImageResource(R.drawable.header_acc);

    myGridView = new GridView(this);
    myImageAdapter=new ImageAdapter(this);
    myGridView.setAdapter(myImageAdapter);

    ll.addView(header);
    ll.addView(myGridView);
    setContentView(ll);
}

快照：

Answer 1

如果你没有使用标题栏，你可以随时摆脱它：

http://elliotth.blogspot.com/2009/07/removing-title-bar-from-your-android.html

Answer 2

更新：如果你在Manifest中设置android:theme="@android:style/Theme.NoTitleBar.Fullscreen"，这应该可以正常工作。

public class MainGrid extends Activity {
    private GridView myGridView;
    private ImageAdapter myImageAdapter;
    private ImageView header;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    LinearLayout ll = new LinearLayout(this);
    ll.setOrientation(LinearLayout.VERTICAL);
    ll.setGravity(Gravity.TOP);   // SET THIS TO TOP

    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
    ll.setLayoutParams(lp);
    // I'VE ADDED LAYOUTPARAMS TOO

    header = new ImageView(getApplicationContext());
    header.setImageResource(R.drawable.header_acc);

    myGridView = new GridView(this);
    myImageAdapter=new ImageAdapter(this);
    myGridView.setAdapter(myImageAdapter);

    ll.addView(header);
    ll.addView(myGridView);
    setContentView(ll);
}

Answer 3

在清单中使用此for活动标记可以解决您的问题

android:theme="@android:style/Theme.NoTitleBar"

对于全屏，您应该使用

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"