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Prevent VerifyError when loading FileCompat.

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Classes which contain calls to platform specific methods cause
problems, because the dexer will go looking for that method even
if you put a guard condition checking the build number. However,
if you lazily load a class depdending on the version number, then
older API devices wont try and load it, and no VerifyError occurs.
This commit is contained in:
Peter Serwylo 2015-01-27 23:24:00 +11:00
parent 08af7ee157
commit 2fe91bc35e
1 changed files with 25 additions and 9 deletions
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34
F-Droid/src/org/fdroid/fdroid/compat/FileCompat.java
View File

@ -19,7 +19,7 @@ public class FileCompat {
if (Compatibility.hasApi(21)) {
symlinkOs(source, dest);
} else if (Compatibility.hasApi(19)) {
} else if (Compatibility.hasApi(15)) {
symlinkLibcore(source, dest);
} else {
symlinkRuntime(source, dest);
@ -28,13 +28,27 @@ public class FileCompat {
return dest.exists();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
protected static void symlinkOs(SanitizedFile source, SanitizedFile dest) {
try {
android.system.Os.symlink(source.getAbsolutePath(), dest.getAbsolutePath());
} catch (ErrnoException e) {
// Do nothing...
/**
* Moved into a separate class rather than just a method, so that phones without API 21 will
* not attempt to load this class at runtime. Otherwise, using the Os.symlink method will cause
* a VerifyError to be thrown at runtime when the FileCompat class is first used.
*/
private static class Symlink21 {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void symlink(SanitizedFile source, SanitizedFile dest) {
try {
android.system.Os.symlink(source.getAbsolutePath(), dest.getAbsolutePath());
} catch (ErrnoException e) {
// Do nothing...
}
}
}
@TargetApi(21)
protected static void symlinkOs(SanitizedFile source, SanitizedFile dest) {
new Symlink21().symlink(source, dest);
}
protected static void symlinkRuntime(SanitizedFile source, SanitizedFile dest) {
@ -58,8 +72,10 @@ public class FileCompat {
Object os = Class.forName("libcore.io.Libcore").getField("os").get(null);
Method symlink = os.getClass().getMethod("symlink", String.class, String.class);
symlink.invoke(os, source.getAbsolutePath(), dest.getAbsolutePath());
} catch (InvocationTargetException | NoSuchMethodException | ClassNotFoundException | IllegalAccessException | NoSuchFieldException e) {
// Do nothing
} catch (Exception e) {
// Should catch more specific exceptions than just "Exception" here, but there are
// some which come from libcore.io.Libcore, which we don't have access to at compile time.
Log.e(TAG, "Could not symlink " + source.getAbsolutePath() + " to " + dest.getAbsolutePath() + ": " + e.getMessage());
}
}