问正确引用深层链接的应用

EN

 /**
 * Return information about who launched this activity.  If the launching Intent
 * contains an {@link android.content.Intent#EXTRA_REFERRER Intent.EXTRA_REFERRER},
 * that will be returned as-is; otherwise, if known, an
 * {@link Intent#URI_ANDROID_APP_SCHEME android-app:} referrer URI containing the
 * package name that started the Intent will be returned.  This may return null if no
 * referrer can be identified -- it is neither explicitly specified, nor is it known which
 * application package was involved.
 *
 * <p>If called while inside the handling of {@link #onNewIntent}, this function will
 * return the referrer that submitted that new intent to the activity.  Otherwise, it
 * always returns the referrer of the original Intent.</p>
 *
 * <p>Note that this is <em>not</em> a security feature -- you can not trust the
 * referrer information, applications can spoof it.</p>
 */
@Nullable
public Uri getReferrer() {
    Intent intent = getIntent();
    try {
        Uri referrer = intent.getParcelableExtra(Intent.EXTRA_REFERRER);
        if (referrer != null) {
            return referrer;
        }
        String referrerName = intent.getStringExtra(Intent.EXTRA_REFERRER_NAME);
        if (referrerName != null) {
            return Uri.parse(referrerName);
        }
    } catch (BadParcelableException e) {
        Log.w(TAG, "Cannot read referrer from intent;"
                + " intent extras contain unknown custom Parcelable objects");
    }
    if (mReferrer != null) {
        return new Uri.Builder().scheme("android-app").authority(mReferrer).build();
    }
    return null;
}