android–AlertDialog源中的resid> = 0x0100000是什么意思？

概述AlertDialog源代码有以下方法：staticintresolveDialogTheme(Contextcontext,intresid){if(resid==THEME_TRADITIONAL){returncom.android.internal.R.style.Theme_Dialog_Alert;}elseif(resid==THEME_HOLO_DARK){returncom.android

AlertDialog源代码有以下方法：

static int resolveDialogtheme(Context context, int resID) {    if (resID == theme_TradITIONAL) {        return com.androID.internal.R.style.theme_Dialog_Alert;    } else if (resID == theme_HolO_DARK) {        return com.androID.internal.R.style.theme_Holo_Dialog_Alert;    } else if (resID == theme_HolO_liGHT) {        return com.androID.internal.R.style.theme_Holo_light_Dialog_Alert;    } else if (resID == theme_DEVICE_DEFAulT_DARK) {        return com.androID.internal.R.style.theme_DeviceDefault_Dialog_Alert;    } else if (resID == theme_DEVICE_DEFAulT_liGHT) {        return com.androID.internal.R.style.theme_DeviceDefault_light_Dialog_Alert;    } else if (resID >= 0x01000000) {   // start of real resource IDs.        return resID;    } else {        TypedValue outValue = new TypedValue();        context.gettheme().resolveAttribute(com.androID.internal.R.attr.alertDialogtheme,                    outValue, true);        return outValue.resourceID;    }}

0x01000000(我明白它是2 ^ 24)是什么意思？什么表达式resID> = 0x0100000检查？为什么渣油应该大于0x01000000到“真实资源ID的开始”？

解决方法:

AndroID资源ID的第24-31位是包ID.

包ID从1,0开始表示这不是基本包.

所以0x01000000是“真实资源ID的开始”.

看到上面的评论“uint32_t ID;”在android frameworks source file中的“struct Restable_package”.

“struct Restable_package”定义如下.

/** * A collection of resource data types within a package.  Followed by * one or more Restable_type and Restable_typespec structures containing the * entry values for each resource type. */struct Restable_package{    struct ResChunk_header header;    // If this is a base package, its ID.  Package IDs start    // at 1 (corresponding to the value of the package bits in a    // resource IDentifIEr).  0 means this is not a base package.    uint32_t ID;    // Actual name of this package, -terminated.    char16_t name[128];    // Offset to a ResstringPool_header defining the resource    // type symbol table.  If zero, this package is inheriting from    // another base package (overrIDing specific values in it).    uint32_t typestrings;    // Last index into typestrings that is for public use by others.    uint32_t lastPublicType;    // Offset to a ResstringPool_header defining the resource    // key symbol table.  If zero, this package is inheriting from    // another base package (overrIDing specific values in it).    uint32_t keyStrings;    // Last index into keyStrings that is for public use by others.    uint32_t lastPublicKey;};

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