Add Method for PackageManagerService in Android, androidsdkmanager

Add Method for PackageManagerService in Android, androidsdkmanager
Structure of related classes of PackageManagerService

The analysis shows that if you want to add the PackageManagerService method, you need to change 1 in IPackageManager. add a method declaration to the aidl file; 2. Add abstract method descriptions to the PackageManager class; 3. Add methods to ApplicationPackageManager to call the remote PackageManagerService method; 4, add the method implementation in PackageManagerService;
Note: Because the MockPackageManager class also inherits the PackageManager class, you also need to add some implementation code. You need to set the added method to hide, or change the API-List to add the new method.

Demo

Objective: To add the public String getHello () method to PackageManagerService ();

Step 1: Add in IPackageManager. aidlGetHello ()Method Declaration

interface IPackageManager {    PackageInfo getPackageInfo(String packageName, int flags);    int getPackageUid(String packageName);    int[] getPackageGids(String packageName);        String[] currentToCanonicalPackageNames(in String[] names);    String[] canonicalToCurrentPackageNames(in String[] names);    PermissionInfo getPermissionInfo(String name, int flags);        List<PermissionInfo> queryPermissionsByGroup(String group, int flags);        PermissionGroupInfo getPermissionGroupInfo(String name, int flags);        List<PermissionGroupInfo> getAllPermissionGroups(int flags);        ApplicationInfo getApplicationInfo(String packageName, int flags);    ActivityInfo getActivityInfo(in ComponentName className, int flags);    ActivityInfo getReceiverInfo(in ComponentName className, int flags);    .    .      .    .    .    .    String getHello();}

Step 2: Add abstract methods in the PackageManager class

public abstract class PackageManager {    /**     * This exception is thrown when a given package, application, or component     * name can not be found.     */    public static class NameNotFoundException extends AndroidException {        public NameNotFoundException() {        }        public NameNotFoundException(String name) {            super(name);        }    }    .    .    .    .    .    .    /**     * @hide     */    public abstract String getHello();}

Step 3: add the specific implementation of the getHello () method to PackageManagerService.

public class PackageManagerService extends IPackageManager.Stub {    static final String TAG = "PackageManager";    static final boolean DEBUG_SETTINGS = false;    private static final boolean DEBUG_PREFERRED = false;    static final boolean DEBUG_UPGRADE = false;    private static final boolean DEBUG_INSTALL = false;    private static final boolean DEBUG_REMOVE = false;    private static final boolean DEBUG_SHOW_INFO = false;    private static final boolean DEBUG_PACKAGE_INFO = false;    .    .    .    .    .    .    .    public String getHello(){        return "Hello,PMS";    }}

Step 4: add the getHello () method to ApplicationPackageManager. The specific implementation is to call the getHello () method of the remote PackageManagerService.

final class ApplicationPackageManager extends PackageManager {    private static final String TAG = "ApplicationPackageManager";    private final static boolean DEBUG = false;    private final static boolean DEBUG_ICONS = false;    @Override    public PackageInfo getPackageInfo(String packageName, int flags)            throws NameNotFoundException {        try {            PackageInfo pi = mPM.getPackageInfo(packageName, flags);            if (pi != null) {                return pi;            }        } catch (RemoteException e) {            throw new RuntimeException("Package manager has died", e);        }        throw new NameNotFoundException(packageName);    }    @Override    public String[] currentToCanonicalPackageNames(String[] names) {        try {            return mPM.currentToCanonicalPackageNames(names);        } catch (RemoteException e) {            throw new RuntimeException("Package manager has died", e);        }    }    .    .    .    .    .    .    .        /**     * @hide     */    @Overridepublic String getHello() {// TODO Auto-generated method stubtry {return mPM.isThirdParty(name);} catch (RemoteException e) {throw new RuntimeException("Package manager has died", e);}}}