在 RelativeLayout 中定位自定义 TableView

Question

在我的主要活动中，我有一个 relativeLayout，我正在向其中动态添加一个名为 IconTray 的自定义类，Extends TableLayout 如下所示。 IconTray 接受一个 ArrayList 并构建表。在表格全部建成并放置 imageViews 之后，我想将表格定位为中心屏幕。我的问题是，我如何定位 IconTray，我是从主要活动还是从其本身进行。

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;
    }

}

我的布局 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

您可以通过 HomeFavesActivity 执行此操作。在 getScreenIcons 方法中调用 rl.addView(iconTray) 之前，添加如下代码：

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

您可能需要稍微调整一下，具体取决于您希望图标托盘的高度和宽度如何工作，但这应该会让您走上正轨。