getColor(int id)在API23时过时
转载自: http://blog.csdn.net/crazy_zihao/article/details/50393193
1.getColor(int id)过时
最近发现getColor(int id)在API版本23时(Android 6.0)已然过时,以下为getColor(int id)源码(Resource.Java)：
/**
* Returns a color integer associated with a particular resource ID. If the
* resource holds a complex {@link ColorStateList}, then the default color
* from the set is returned.
*
* @param id The desired resource identifier, as generated by the aapt
* tool. This integer encodes the package, type, and resource
* entry. The value 0 is an invalid identifier.
*
* @throws NotFoundException Throws NotFoundException if the given ID does
* not exist.
*
* @return A single color value in the form 0xAARRGGBB.
* @deprecated Use {@link #getColor(int, Theme)} instead.
*/
@ColorInt
@Deprecated
public int getColor(@ColorRes int id) throws NotFoundException {
return getColor(id, null);
}
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此类中使用了新方法getColor(@ColorRes int id, @Nullable Theme theme)来获取资源：
/** * Returns a themed color integer associated with a particular resource ID. * If the resource holds a complex {@link ColorStateList}, then the default * color from the set is returned. * * @param id The desired resource identifier, as generated by the aapt * tool. This integer encodes the package, type, and resource * entry. The value 0 is an invalid identifier. * @param theme The theme used to style the color attributes, may be * {@code null}. * * @throws NotFoundException Throws NotFoundException if the given ID does * not exist. * * @return A single color value in the form 0xAARRGGBB. */
@ColorInt
public int getColor(@ColorRes int id, @Nullable Theme theme) throws NotFoundException {
TypedValue value;
synchronized (mAccessLock) {
value = mTmpValue;
if (value == null) {
value = new TypedValue();
}
getValue(id, value, true);
if (value.type >= TypedValue.TYPE_FIRST_INT
&& value.type <= TypedValue.TYPE_LAST_INT) {
mTmpValue = value;
return value.data;
} else if (value.type != TypedValue.TYPE_STRING) {
throw new NotFoundException(
"Resource ID #0x" + Integer.toHexString(id) + " type #0x"
+ Integer.toHexString(value.type) + " is not valid");
}
mTmpValue = null;
}
final ColorStateList csl = loadColorStateList(value, id, theme);
synchronized (mAccessLock) {
if (mTmpValue == null) {
mTmpValue = value;
}
}
return csl.getDefaultColor();
}
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2.当前替代的使用方法
// 同时兼容高、低版本
ContextCompat.getColor(Context context, int id);
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1.源码解析
ContextCompat.getColor(Context context, int id)源码如下：
/**
* Returns a color associated with a particular resource ID
* <p>
* Starting in {@link android.os.Build.VERSION_CODES#M}, the returned
* color will be styled for the specified Context's theme.
*
* @param id The desired resource identifier, as generated by the aapt
* tool. This integer encodes the package, type, and resource
* entry. The value 0 is an invalid identifier.
* @return A single color value in the form 0xAARRGGBB.
* @throws android.content.res.Resources.NotFoundException if the given ID
* does not exist.
*/
public static final int getColor(Context context, int id) {
final int version = Build.VERSION.SDK_INT;
if (version >= 23) {
return ContextCompatApi23.getColor(context, id);
} else {
return context.getResources().getColor(id);
}
}
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从这里我们可以看出，当API版本>=23时，使用ContextCompatApi23.getColor(context, id)方法，当API版本<23时，使用context.getResources().getColor(id)方法获取相应色值，继续往下看：
ContextCompatApi23.getColor(context, id)源码如下：
// ContextCompatApi23.java
public static int getColor(Context context, int id) {
return context.getColor(id);
}
// 继续解析context.getColor(id)源码--Context.java：
/** * Returns a color associated with a particular resource ID and styled for * the current theme. * * @param id The desired resource identifier, as generated by the aapt * tool. This integer encodes the package, type, and resource * entry. The value 0 is an invalid identifier. * @return A single color value in the form 0xAARRGGBB. * @throws android.content.res.Resources.NotFoundException if the given ID * does not exist. */
@Nullable
public final int getColor(int id) {
// 注：这里调用了Resource.java类中的getColor(int id, Theme theme)方法
return getResources().getColor(id, getTheme());
}
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context.getResources().getColor(id)源码如下：
/** * Returns a color integer associated with a particular resource ID. If the * resource holds a complex {@link ColorStateList}, then the default color * from the set is returned. * * @param id The desired resource identifier, as generated by the aapt * tool. This integer encodes the package, type, and resource * entry. The value 0 is an invalid identifier. * * @throws NotFoundException Throws NotFoundException if the given ID does * not exist. * * @return A single color value in the form 0xAARRGGBB. * @deprecated Use {@link #getColor(int, Theme)} instead. */
@ColorInt
@Deprecated
public int getColor(@ColorRes int id) throws NotFoundException {
// 这里同样调用了Resource.java中的getColor(int id, Theme theme)方法,传入的Theme值为null(低版本)--等同于调用getColor(int id)--参考上面源码.
return getColor(id, null);
}
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