自定义VIEWGROUP的一个用法

图片看http://www.curious-creature.org/2009/03/01/android-layout-tricks-3-optimize-part-1/

<merge
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:okCancelBar="http://schemas.android.com/apk/res/com.example.android.merge">

  <ImageView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 

    android:scaleType="center"
    android:src="@drawable/golden_gate" />

  <com.example.android.merge.OkCancelBar
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"

    android:paddingTop="8dip"
    android:gravity="center_horizontal"

    android:background="#AA000000"

    okCancelBar:okLabel="Save"
    okCancelBar:cancelLabel="Don't save" />

</merge>com.example.android.merge.OkCancelBar
是一个自定义的GROUP

public class OkCancelBar extends LinearLayout {
   public OkCancelBar(Context context, AttributeSet attrs) {
     super(context, attrs);
     setOrientation(HORIZONTAL);
     setGravity(Gravity.CENTER);
     setWeightSum(1.0f);
 
     LayoutInflater.from(context).inflate(R.layout.okcancelbar, this, true);
 
     TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.OkCancelBar, 0, 0);
 
     String text = array.getString(R.styleable.OkCancelBar_okLabel);
     if (text == null) text = "Ok";
     ((Button) findViewById(R.id.okcancelbar_ok)).setText(text);
 
     text = array.getString(R.styleable.OkCancelBar_cancelLabel);
     if (text == null) text = "Cancel";
     ((Button) findViewById(R.id.okcancelbar_cancel)).setText(text);
 
     array.recycle();
   }
 }

LayoutInflater.from(context).inflate(R.layout.okcancelbar, this, true);
直接从XML中得到一个VIEW加入到当前GROUP中
okcancelbar.xml:

<merge xmlns:android="http://schemas.android.com/apk/res/android">
  <include
    layout="@layout/okcancelbar_button"
    android:id="@+id/okcancelbar_ok" />

  <include
    layout="@layout/okcancelbar_button"
    android:id="@+id/okcancelbar_cancel" />
</merge>
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