java floatmath_【Android】解决FloatMath类中方法在API 23以后不存在问题
1.問題原因分析
在Android SDK更新至23以上時，我們會發(fā)現(xiàn)之前在某些地方因計算需要使用到的FloatMath類中的方法如FloatMath.ceil()與FloatMath.sin()等都報錯并提示不可用了，FloatMath源碼如下：
package android.util;
/**
* Math routines similar to those found in {@link java.lang.Math}.
* 數(shù)學(xué)例程類似于{@link java.lang.Math}.
*
Historically these methods were faster than the equivalent double-based
* {@link java.lang.Math} methods. On versions of Android with a JIT they
* became slower and have since been re-implemented to wrap calls to
* {@link java.lang.Math}. {@link java.lang.Math} should be used in
* preference.
*
*
All methods were removed from the public API in version 23.
* 所有方法都從版本23的公共API中刪除.
* @deprecated Use {@link java.lang.Math} instead.
* 方法過時，應(yīng)使用java.lang.Math代替.
*/
@Deprecated
public class FloatMath {
/** Prevents instantiation. */
private FloatMath() {}
/**
* Returns the float conversion of the most positive (i.e. closest to
* positive infinity) integer value which is less than the argument.
*
* @param value to be converted
* @return the floor of value
* @removed
*/
public static float floor(float value) {
return (float) Math.floor(value);
}
/**
* Returns the float conversion of the most negative (i.e. closest to
* negative infinity) integer value which is greater than the argument.
*
* @param value to be converted
* @return the ceiling of value
* @removed
*/
public static float ceil(float value) {
return (float) Math.ceil(value);
}
/**
* Returns the closest float approximation of the sine of the argument.
*
* @param angle to compute the cosine of, in radians
* @return the sine of angle
* @removed
*/
public static float sin(float angle) {
return (float) Math.sin(angle);
}
/**
* Returns the closest float approximation of the cosine of the argument.
*
* @param angle to compute the cosine of, in radians
* @return the cosine of angle
* @removed
*/
public static float cos(float angle) {
return (float) Math.cos(angle);
}
/**
* Returns the closest float approximation of the square root of the
* argument.
*
* @param value to compute sqrt of
* @return the square root of value
* @removed
*/
public static float sqrt(float value) {
return (float) Math.sqrt(value);
}
/**
* Returns the closest float approximation of the raising "e" to the power
* of the argument.
*
* @param value to compute the exponential of
* @return the exponential of value
* @removed
*/
public static float exp(float value) {
return (float) Math.exp(value);
}
/**
* Returns the closest float approximation of the result of raising {@code
* x} to the power of {@code y}.
*
* @param x the base of the operation.
* @param y the exponent of the operation.
* @return {@code x} to the power of {@code y}.
* @removed
*/
public static float pow(float x, float y) {
return (float) Math.pow(x, y);
}
/**
* Returns {@code sqrt(}{@code x}{@code 2}{@code +}
* {@code y}{@code 2}{@code )}.
*
* @param x a float number
* @param y a float number
* @return the hypotenuse
* @removed
*/
public static float hypot(float x, float y) {
return (float) Math.hypot(x, y);
}
}
通過觀察類說明可知，FloatMath的所有方法都已經(jīng)從版本23的公共API中刪除，官方提示我們可以使用java.lang.Math類來代替使用。
2.解決方法
使用23以下版本的SDK進(jìn)行編譯，即修改gradle.build文件里的compileSdkVersion為23以下版本即可。
使用Math類中的方法進(jìn)行代替。
總結(jié)
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