在build/tools/buildinfo.sh中定義ro.build.fingerprint=$BUILD_FINGERPRINT.
然后在build/core/Makefile中給BUILD_FINGERPRINT賦值
但這里確定的是手機system/build.prop中的ro.build.fingerprint,是編譯時決定的
getprop讀取到的ro.build.fingerprint的值,是運行時決定的,在frameworks/base/core/java/android/os/Build.java 中:
923 /** A string that uniquely identifies this build. Do not attempt to parse this value. */
924 public static final String FINGERPRINT = deriveFingerprint();
925
926 /**
927 * Some devices split the fingerprint components between multiple
928 * partitions, so we might derive the fingerprint at runtime.
929 */
930 private static String deriveFingerprint() {
931 Stringfinger = SystemProperties.get("ro.build.fingerprint");
932 if (TextUtils.isEmpty(finger)) {
933 finger = getString("ro.product.brand") + '/' +
934 getString("ro.product.name") + '/' +
935 getString("ro.product.device") + ':' +
936 getString("ro.build.version.release") + '/' +
937 getString("ro.build.id") + '/' +
938 getString("ro.build.version.incremental") + ':' +
939 getString("ro.build.type") + '/' +
940 getString("ro.build.tags");
941 }
942 return finger;
943 }