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Added in API level 18

public interface TextDirectionHeuristic

android.text.TextDirectionHeuristic

使用启发式的对象的接口，通过检查文本来在段落方向上进行猜测。

Public methods
`abstract boolean`	`isRtl(char[] array, int start, int count)` 猜猜一个字符数组是否在RTL方向上。
`abstract boolean`	`isRtl(CharSequence cs, int start, int count)` 猜测 `CharSequence`是否处于RTL方向。

Added in API level 18

boolean isRtl (char[] array, 
                int start, 
                int count)

猜猜一个字符数组是否在RTL方向上。

Parameters
`array`	`char`: the char array.
`start`	`int`: start index, inclusive.
`count`	`int`: the length to check, must not be negative and not greater than `array.length - start`.

Returns
`boolean`	true if all chars in the range are to be considered in a RTL direction, false otherwise.

Added in API level 18

boolean isRtl (CharSequence cs, 
                int start, 
                int count)

猜测 CharSequence是否处于RTL方向。

Parameters
`cs`	`CharSequence`: the CharSequence.
`start`	`int`: start index, inclusive.
`count`	`int`: the length to check, must not be negative and not greater than `CharSequence.length() - start`.

Returns
`boolean`	true if all chars in the range are to be considered in a RTL direction, false otherwise.