import com.google.android.apps.dashclock.api.internal.IExtensionHost; //导入依赖的package包/类
@Override
public void onInitialize(IExtensionHost host, boolean isReconnect)
        throws RemoteException {
    if (checkCallingOrSelfPermission(PERMISSION_READ_EXTENSION_DATA)
            != PackageManager.PERMISSION_GRANTED) {
        throw new SecurityException("Caller does not have the READ_EXTENSION_DATA "
                + "permission.");
    }

    mHost = host;

    if (!mInitialized) {
        DashClockExtension.this.onInitialize(isReconnect);
        mInitialized = true;
    }
}
 

import com.google.android.apps.dashclock.api.internal.IExtensionHost; //导入依赖的package包/类
@Override
public void onInitialize(IExtensionHost host, boolean isReconnect)
        throws RemoteException {
    if (!mIsWorldReadable) {
        // If not world readable, check the signature of the [first] package with the given
        // UID against the known-good official DashClock app signature.
        boolean verified = false;
        PackageManager pm = getPackageManager();
        String[] packages = pm.getPackagesForUid(getCallingUid());
        if (packages != null && packages.length > 0) {
            try {
                PackageInfo pi = pm.getPackageInfo(packages[0],
                        PackageManager.GET_SIGNATURES);
                if (pi.signatures != null
                        && pi.signatures.length == 1
                        && DashClockSignature.SIGNATURE.equals(pi.signatures[0])) {
                    verified = true;
                }
            } catch (PackageManager.NameNotFoundException ignored) {
            }
        }

        if (!verified) {
            Log.e(TAG, "Caller is not official DashClock app and this "
                    + "extension is not world-readable.");
            throw new SecurityException("Caller is not official DashClock app and this "
                    + "extension is not world-readable.");
        }
    }

    mHost = host;

    if (!mInitialized) {
        DashClockExtension.this.onInitialize(isReconnect);
        mInitialized = true;
    }
}
 

import com.google.android.apps.dashclock.api.internal.IExtensionHost; //导入依赖的package包/类
@Override
public void onInitialize(IExtensionHost host, boolean isReconnect)
        throws RemoteException {
    if (!mIsWorldReadable) {
        // If not world readable, check the signature of the [first] package with the given
        // UID against the known-good official DashClock app signature.
        boolean verified = false;
        PackageManager pm = getPackageManager();
        String[] packages = pm.getPackagesForUid(getCallingUid());
        if (packages != null && packages.length > 0) {
            try {
                PackageInfo pi = pm.getPackageInfo(packages[0],
                        PackageManager.GET_SIGNATURES);
                if (pi.signatures != null
                        && pi.signatures.length == 1
                        && DASHCLOCK_SIGNATURE.equals(pi.signatures[0])) {
                    verified = true;
                }
            } catch (PackageManager.NameNotFoundException ignored) {
            }
        }

        if (!verified) {
            Log.e(TAG, "Caller is not official DashClock app and this "
                    + "extension is not world-readable.");
            throw new SecurityException("Caller is not official DashClock app and this "
                    + "extension is not world-readable.");
        }
    }

    mHost = host;

    if (!mInitialized) {
        DashClockExtension.this.onInitialize(isReconnect);
        mInitialized = true;
    }
}