在RelativeLayout中定位自定義TableView

Question

在我的主要活動中，我有一個relativeLayout，我在其中動態添加一個名爲IconTray的自定義類，其中Extends TableLayout在下面顯示。 IconTray需要一個ArrayList並構建表。在表格全部構建好並且imageViews已經放置好之後，我想將表格定位爲中心屏幕。我的問題是，我如何定位IconTray並從主要活動或從本身做到這一點。

我的MainActivity：

import java.util.ArrayList; 
import android.app.Activity; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.DialogInterface.OnClickListener; 
import android.graphics.Point; 
import android.os.Bundle; 
import android.util.AttributeSet; 
import android.util.DisplayMetrics; 
import android.util.Log; 
import android.view.Display; 
import android.view.View; 
import android.view.View.OnLongClickListener; 
import android.widget.RelativeLayout; 
import android.widget.Toast; 

public class HomeFavesActivity extends Activity implements OnClickListener, OnLongClickListener{ 

    private static final String TAG = "HomeFavesCatovoty"; 
    private ArrayList<Integer> mIcons = new ArrayList<Integer>(); 


    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 



     Log.v(TAG, "CREATED"); 

     DataBaseManager db = new DataBaseManager(this); 
     db.getWritableDatabase(); 
     db.AddHomeScreenIcon(1); 
     db.AddHomeScreenIcon(2); 
     db.AddHomeScreenIcon(3); 
     /*db.AddHomeScreenIcon(4); 
     db.AddHomeScreenIcon(5); 
     db.AddHomeScreenIcon(6); 
     db.AddHomeScreenIcon(7);*/ 

     getScreenIcons(db); 


    } 

    private void getScreenIcons(DataBaseManager db){ 
     mIcons = db.getHomeScreenIcons(); 
     Log.v(TAG, "List Length:"+ mIcons.size()); 

     IconTray iconTray = new IconTray(this, mIcons, null); 
     RelativeLayout rl = (RelativeLayout)findViewById(R.id.main); 

     DisplayMetrics metrics = new DisplayMetrics(); 
     getWindowManager().getDefaultDisplay().getMetrics(metrics); 

     int screenWidth = metrics.heightPixels; 
     int screenHeight =metrics.widthPixels; 

     RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(screenWidth, screenHeight); 
     params.addRule(RelativeLayout.CENTER_IN_PARENT); 
     iconTray.setLayoutParams(params); 
     rl.addView(iconTray); 


    } 


    public void onClick(DialogInterface arg0, int arg1) { 
     // TODO Auto-generated method stub 

    } 

    public boolean onLongClick(View v) { 

     Toast.makeText(this, "woot", 
      Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

} 

我的佈局XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="@string/hello" /> 

    <RelativeLayout 
     android:id="@+id/main" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent" 
     android:layout_gravity="center" 
     > 

    </RelativeLayout> 

</LinearLayout> 

Answer 1

您可以從您HomeFavesActivity做到這一點。您在getScreenIcons方法調用rl.addView（iconTray）權利之前，添加代碼，看起來像這樣：

RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(someWidth, someHeight); 
params.addRule(RelativeLayout.CENTER_IN_PARENT); 
iconTray.setLayoutParams(params); 

你可能有這一點取決於你如何想要的圖標的高度和寬度玩托盤上班，但這應該讓你走上正軌。