Android13-Launcer3_禁止卸载某个APP

未禁止前

Launcher3/res/layout/launcher.xml

launcher.xml

显示移除、卸载的布局

        <include
            android:id="@+id/drop_target_bar"
            layout="@layout/drop_target_bar" />

Launcher3/res/layout/drop_target_bar.xml

drop_target_bar.xml

<com.android.launcher3.DropTargetBar xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/dynamic_grid_drop_target_size"
    android:layout_gravity="center_horizontal|top"
    android:focusable="false"
    android:alpha="0"
    android:theme="@style/HomeScreenElementTheme"
    android:visibility="invisible">

    <!-- Delete target -->
    <com.android.launcher3.DeleteDropTarget
        android:id="@+id/delete_target_text"
        style="@style/DropTargetButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:text="@string/remove_drop_target_label" />

    <!-- Uninstall target -->
    <com.android.launcher3.SecondaryDropTarget
        android:id="@+id/uninstall_target_text"
        style="@style/DropTargetButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:text="@string/uninstall_drop_target_label" />

</com.android.launcher3.DropTargetBar>

Launcher3/src/com/android/launcher3/SecondaryDropTarget.java

Launcher3/src/com/android/launcher3/ButtonDropTarget.java

SecondaryDropTarget继承自ButtonDropTarget

ButtonDropTarget

    //监听开始拖拽后是否显示卸载按钮
		@Override
    public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
        if (options.isKeyboardDrag) {
            mActive = false;
        } else {
            setupItemInfo(dragObject.dragInfo);
						//这里判断是否要显示
            mActive = supportsDrop(dragObject.dragInfo);
        }
        setVisibility(mActive ? View.VISIBLE : View.GONE);

        mAccessibleDrag = options.isAccessibleDrag;
        setOnClickListener(mAccessibleDrag ? this : null);
    }
		//SecondaryDropTarget负责具体实现
    protected abstract boolean supportsDrop(ItemInfo info);

SecondaryDropTarget

    @Override
    protected boolean supportsDrop(ItemInfo info) {
        return getButtonType(info, getViewUnderDrag(info)) != INVALID;
    }

    private int getButtonType(ItemInfo info, View view) {
        //这里测试APP名可以
        if(null != info.title && "My Application".equals(info.title.toString())){
            return  INVALID;
        }
        if (view instanceof AppWidgetHostView) {
            if (getReconfigurableWidgetId(view) != INVALID_APPWIDGET_ID) {
                return RECONFIGURE;
            }
            return INVALID;
        } else if (info.isPredictedItem()) {
            return DISMISS_PREDICTION;
        }

        Boolean uninstallDisabled = mUninstallDisabledCache.get(info.user);
        if (uninstallDisabled == null) {
            UserManager userManager =
                    (UserManager) getContext().getSystemService(Context.USER_SERVICE);
            Bundle restrictions = userManager.getUserRestrictions(info.user);
            uninstallDisabled = restrictions.getBoolean(UserManager.DISALLOW_APPS_CONTROL, false)
                    || restrictions.getBoolean(UserManager.DISALLOW_UNINSTALL_APPS, false);
            mUninstallDisabledCache.put(info.user, uninstallDisabled);
        }
        // Cancel any pending alarm and set cache expiry after some time
        mCacheExpireAlarm.setAlarm(CACHE_EXPIRE_TIMEOUT);
        mCacheExpireAlarm.setOnAlarmListener(this);
        if (uninstallDisabled) {
            return INVALID;
        }

        if (info instanceof ItemInfoWithIcon) {
            ItemInfoWithIcon iconInfo = (ItemInfoWithIcon) info;
            if ((iconInfo.runtimeStatusFlags & FLAG_SYSTEM_MASK) != 0
                    && (iconInfo.runtimeStatusFlags & FLAG_SYSTEM_NO) == 0) {
                return INVALID;
            }
        }
        if (getUninstallTarget(info) == null) {
            return INVALID;
        }
        return UNINSTALL;
    }

禁止卸载后效果