android中一些特殊字符（如：←↑→↓等箭头符号）的Unicode码值

<RelativeLayout
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:gravity="center_horizontal" >

      <Button
        android:id="@+id/scroll_left"
        android:layout_width="40dip"
        android:layout_height="40dip"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:text="@string/left_arrow" />

      <Button
        android:id="@+id/scroll_up"
        android:layout_width="40dip"
        android:layout_height="40dip"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@id/scroll_left"
        android:text="@string/up_arrow" />

      <Button
        android:id="@+id/scroll_down"
        android:layout_width="40dip"
        android:layout_height="40dip"
        android:layout_below="@id/scroll_up"
        android:layout_toRightOf="@id/scroll_left"
        android:text="@string/down_arrow" />

      <Button
        android:id="@+id/scroll_right"
        android:layout_width="40dip"
        android:layout_height="40dip"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/scroll_down"
        android:text="@string/right_arrow" />
    </RelativeLayout>

    <LinearLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:orientation="vertical" >

      <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/music" />

      <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/crown" />
    </LinearLayout>

<string name="music">\u265A</string>
<string name="crown">\u266B</string>

<string name="left_arrow">\u2190</string>
<string name="up_arrow">\u2191</string>
<string name="down_arrow">\u2193</string>
<string name="right_arrow">\u2192</string>