Android RK 内置应用不可卸载

一.第一种方案

1.1.将客户应用内置到system/app 也就是将应用提升至系统级别需要注意的是要将依赖lib库拷贝到system/lib 下面
静默升级也需要更新或者添加的库以前没有的库建议：使用到不需要更新的apk 或者手动更新

二.第二种方案
2.1.预装应有到system/preinstall 但不允许卸载静默升级推荐使用

仨.第二种方案两种改法 OS Android5.1

3.1.Fist 改法

拖动到删除按钮直接识别到可不包名不让卸载

diff --git a/packages/apps/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java b/packages/apps/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java
index 449bfad..5d12be9 100755
--- a/packages/apps/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java
+++ b/packages/apps/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java
@@ -216,8 +216,13 @@ public class UninstallerActivity extends Activity implements OnCancelListener{
                 // Continue as the ActivityInfo isn't critical.
             }
         }
-
-        showConfirmationDialog();
+       
+        if((packageName != null)&& packageName.contains("com.gatsby.test")){
+           Log.d("gatsby","UninstallerActivity uninstall ");
+            System.exit(0);                
+       }else {     
+           showConfirmationDialog();
+       }       
     }
      
     public void OnCreateDialog(){

3.2.Second 改法识别包名不显示卸载按钮

a.packages\apps\Launcher3\src\com\android\launcher3\DeleteDropTarget.java

boolean useDeleteLabel = !useUninstallLabel && source.supportsDeleteDropTarget();

if(info instanceof AppInfo){
    AppInfo appInfo = (AppInfo) info;
    if(appInfo.componentName.getPackageName().equals("com.gatsby.test")){           
     useUninstallLabel = false;         
    } 
 
}  　　　　

控制是否显示长按 “卸载” 的选项

@Override
public void onDragStart(DragSource source, Object info, int dragAction) {
    boolean isVisible = true;
    boolean useUninstallLabel = !LauncherAppState.isDisableAllApps() &&
            isAllAppsApplication(source, info);
    boolean useDeleteLabel = !useUninstallLabel && source.supportsDeleteDropTarget();
 
    // If we are dragging an application from AppsCustomize, only show the control if we can
    // delete the app (it was downloaded), and rename the string to "uninstall" in such a case.
    // Hide the delete target if it is a widget from AppsCustomize.
    if (!willAcceptDrop(info) || isAllAppsWidget(source, info)) {
        isVisible = false;
    }
    if (useUninstallLabel) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
            UserManager userManager = (UserManager)
                    getContext().getSystemService(Context.USER_SERVICE);
            Bundle restrictions = userManager.getUserRestrictions();
            if (restrictions.getBoolean(UserManager.DISALLOW_APPS_CONTROL, false)
                    || restrictions.getBoolean(UserManager.DISALLOW_UNINSTALL_APPS, false)) {
                isVisible = false;
            }
        }
    }
 
    if (useUninstallLabel) {
        setCompoundDrawablesRelativeWithIntrinsicBounds(mUninstallDrawable, null, null, null);
    } else if (useDeleteLabel) {
        setCompoundDrawablesRelativeWithIntrinsicBounds(mRemoveDrawable, null, null, null);
    } else {
        isVisible = false;
    }
    mCurrentDrawable = (TransitionDrawable) getCurrentDrawable();
 
    mActive = isVisible;
    resetHoverColor();
    ((ViewGroup) getParent()).setVisibility(isVisible ? View.VISIBLE : View.GONE);
    if (isVisible && getText().length() > 0) {
        setText(useUninstallLabel ? R.string.delete_target_uninstall_label
            : R.string.delete_target_label);
    }
}

b. packages\apps\Settings\src\com\android\settings\applications\InstalledAppDetails.java

设置应用信息卸载项目

mUninstallButton.setOnClickListener(this); 让点击无效

private void initUninstallButtons() {
    mUpdatedSysApp = (mAppEntry.info.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0;
    final boolean isBundled = (mAppEntry.info.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
    boolean enabled = true;
    if (mUpdatedSysApp) {
        mUninstallButton.setText(R.string.app_factory_reset);
        boolean showSpecialDisable = false;
        if (isBundled) {
            showSpecialDisable = handleDisableable(mSpecialDisableButton);
            mSpecialDisableButton.setOnClickListener(this);
        }
        if (mAppControlRestricted) {
            showSpecialDisable = false;
        }
        mMoreControlButtons.setVisibility(showSpecialDisable ? View.VISIBLE : View.GONE);
    } else {
        mMoreControlButtons.setVisibility(View.GONE);
        if (isBundled) {
            enabled = handleDisableable(mUninstallButton);
        } else if ((mPackageInfo.applicationInfo.flags
                & ApplicationInfo.FLAG_INSTALLED) == 0
                && mUserManager.getUsers().size() >= 2) {
            // When we have multiple users, there is a separate menu
            // to uninstall for all users.
            mUninstallButton.setText(R.string.uninstall_text);
            enabled = false;
        } else {
            mUninstallButton.setText(R.string.uninstall_text);
        }
    }
    // If this is a device admin, it can't be uninstalled or disabled.
    // We do this here so the text of the button is still set correctly.
    if (mDpm.packageHasActiveAdmins(mPackageInfo.packageName)) {
        enabled = false;
    }
 
    // Home apps need special handling.  Bundled ones we don't risk downgrading
    // because that can interfere with home-key resolution.  Furthermore, we
    // can't allow uninstallation of the only home app, and we don't want to
    // allow uninstallation of an explicitly preferred one -- the user can go
    // to Home settings and pick a different one, after which we'll permit
    // uninstallation of the now-not-default one.
    if (enabled && mHomePackages.contains(mPackageInfo.packageName)) {
        if (isBundled) {
            enabled = false;
        } else {
            ArrayList<ResolveInfo> homeActivities = new ArrayList<ResolveInfo>();
            ComponentName currentDefaultHome  = mPm.getHomeActivities(homeActivities);
            if (currentDefaultHome == null) {
                // No preferred default, so permit uninstall only when
                // there is more than one candidate
                enabled = (mHomePackages.size() > 1);
            } else {
                // There is an explicit default home app -- forbid uninstall of
                // that one, but permit it for installed-but-inactive ones.
                enabled = !mPackageInfo.packageName.equals(currentDefaultHome.getPackageName());
            }
        }
    }
 
    if (mAppControlRestricted) {
        enabled = false;
    }
 
    mUninstallButton.setEnabled(enabled);
    if (enabled) {
        // Register listener
        mUninstallButton.setOnClickListener(this);
    }
}