如何删除标题栏和LinearLayout的第一个元素之间的黑色空间? [英] How to remove the black space between the title bar and the first element of a LinearLayout?

问题描述

我有一个线性布局，其中第一个元素是imageview标头，第二个元素是gridview.

I have a linearlayout, wich the first element is a imageview header, and the second element is a gridview.

它工作正常，但是我在android标题栏和应用程序标题之间有一个50px(或多或少)的错误黑色空间，这是linearlayout的第一个元素

It works fine, but i have a erroneal black space of 50px (more or less) between the android tittle bar and the header of the app, wich is the first element of the linearlayout

为什么我有那个空间?我发现将其删除的唯一方法是将以下行放置:ll.setPadding(0, -50, 0, 0);

Why i got that space? the only way i find to remove it is to put this line: 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:

推荐答案

更新:如果您在清单中设置android:theme="@android:style/Theme.NoTitleBar.Fullscreen"，则此方法就可以正常工作.

Update: This should work just fine if you set android:theme="@android:style/Theme.NoTitleBar.Fullscreen" in the Manifest.

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);
}

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