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>