System中-->
@CallerSensitive
public static void load(String filename) {
Runtime.getRuntime().load0(Reflection.getCallerClass(), filename);
}
//最終調(diào)用Runtime中的load0方法，重點(diǎn)看load0即可
Runtime-->
synchronized void load0(Class<?> fromClass, String filename) {
if (!(new File(filename).isAbsolute())) {//此處判斷如果文件路徑名是否為絕對(duì)路徑，不是則拋出異常
throw new UnsatisfiedLinkError(
"Expecting an absolute path of the library: " + filename);
}
if (filename == null) {
throw new NullPointerException("filename == null");
}
String error = nativeLoad(filename, fromClass.getClassLoader());
if (error != null) {
throw new UnsatisfiedLinkError(error);
}
}
load總結(jié)：
load方法中會(huì)測(cè)試傳入的抽象路徑名是否為絕對(duì)路徑。
絕對(duì)路徑名的定義取決于系統(tǒng)。
在A(yíng)ndroid上，絕對(duì)路徑以字符“ /”開(kāi)頭。
loadLibrary源碼
System-->
@CallerSensitive
public static void loadLibrary(String libname) {
Runtime.getRuntime().loadLibrary0(Reflection.getCallerClass(), libname);
}
Runtime-->
//最終調(diào)用Runtime中l(wèi)oadLibrary0
private synchronized void loadLibrary0(ClassLoader loader, Class<?> callerClass, String libname) {
if (libname.indexOf((int)File.separatorChar) != -1) {//此方法判斷l(xiāng)ibname中是否含有分隔符，有的話(huà)就拋出異常
throw new UnsatisfiedLinkError(
"Directory separator should not appear in library name: " + libname);
}
String libraryName = libname;
// Android-note: BootClassLoader doesn't implement findLibrary(). http://b/111850480
// Android's class.getClassLoader() can return BootClassLoader where the RI would
// have returned null; therefore we treat BootClassLoader the same as null here.
if (loader != null && !(loader instanceof BootClassLoader)) {
String filename = loader.findLibrary(libraryName);
if (filename == null) {
// It's not necessarily true that the ClassLoader used
// System.mapLibraryName, but the default setup does, and it's
// misleading to say we didn't find "libMyLibrary.so" when we
// actually searched for "liblibMyLibrary.so.so".
throw new UnsatisfiedLinkError(loader + " couldn't find \"" +
System.mapLibraryName(libraryName) + "\"");
}
String error = nativeLoad(filename, loader);
if (error != null) {
throw new UnsatisfiedLinkError(error);
}
return;
}
// We know some apps use mLibPaths directly, potentially assuming it's not null.
// Initialize it here to make sure apps see a non-null value.
getLibPaths();
String filename = System.mapLibraryName(libraryName);
String error = nativeLoad(filename, loader, callerClass);
if (error != null) {
throw new UnsatisfiedLinkError(error);
}
}
解析：
* libname.indexOf((int)File.separatorChar) != -1
File-->
public static final char separatorChar = fs.getSeparator();
