protected StringBuilder buildToString(final Class<?> clazz) {
		final StringBuilder builder = new StringBuilder(clazz.getSimpleName()).append('{').append(packageName);
		if (! isInstalled()) builder.append(", not installed");
		if (isSystem()) builder.append(", system");
		if (! enabled) builder.append(", disabled");
		return builder;
	}
Called by {@link AppListProvider#onTrimMemory(int)} to trim memory in memory-critical situation
mobile/src/main/java/com/oasisfeng/common/app/AppInfo.java